Chinook Posted August 21, 2018 Author Share Posted August 21, 2018 This is an extremely well organized hurricane now. The CPHC put the latest intensity at 115 kt, which is higher than a day ago. Unfortunately, this may not pass by Hawaii as Hurricane Hector did, not long ago. Looks like the 96 hr track is relatively close to Honolulu Link to comment Share on other sites More sharing options...
NJwx85 Posted August 21, 2018 Share Posted August 21, 2018 Looks like I picked a bad time to vacation in Ko Olina. Link to comment Share on other sites More sharing options...
nycwinter Posted August 21, 2018 Share Posted August 21, 2018 16 minutes ago, NJwx85 said: Looks like I picked a bad time to vacation in Ko Olina. you can always take the next flight out tomorrow ... Link to comment Share on other sites More sharing options...
nycwinter Posted August 21, 2018 Share Posted August 21, 2018 18 minutes ago, NJwx85 said: Looks like I picked a bad time to vacation in Ko Olina. looks like the euro has come on board for some direct impacts from the storm... Link to comment Share on other sites More sharing options...
NJwx85 Posted August 21, 2018 Share Posted August 21, 2018 1 hour ago, nycwinter said: you can always take the next flight out tomorrow ... You can’t just call up an airline and change a flight, especially with the small number of flights each day back to NY. Not to mention others will be doing the same. Link to comment Share on other sites More sharing options...
NJwx85 Posted August 27, 2018 Share Posted August 27, 2018 The GFS has a parade of tropical systems approaching Hawaii over the next two weeks. None of them look to track as far South as Lane did, so the threat for a direct impact appears minimal at this time. Link to comment Share on other sites More sharing options...
Windspeed Posted August 30, 2018 Share Posted August 30, 2018 The EPAC continues to ball out. Norman has rapidly intensified and is now a beautiful category 4 major hurricane: Link to comment Share on other sites More sharing options...
Chinook Posted August 31, 2018 Author Share Posted August 31, 2018 Norman, last evening at 0035z, when the NHC analyzed this at 130 kt Link to comment Share on other sites More sharing options...
Windspeed Posted October 16, 2018 Share Posted October 16, 2018 Dusting off the cobwebs in this thread. Tara is in the process dissipating in 24 hr near the SW Mexican coast; however, there is a new area associated with the CAG and 94L that may interact with a northerly jet over the Gulf of Tehuantepec. A number of GEFS and EPS suites have suggested cyclogenesis occurring south of Guatemala and is climatologically favored in the current setup. Why it's worth watching is that some of the guidance shows signficant intensification in 3-5 days and also the possibility of a mid-to-upper weakness or trough being modeled late in 7-10 day range that could pull the TC into the S. Baja or Sinaloa region Mexico. A tropical wave located over western Nicaragua, southwestern Honduras, and eastern El Salvador will move westward into the eastern Pacific Ocean later this evening. The combination of the wave and a strong northerly wind event over the Gulf of Tehuantepec is expected to develop a low pressure system a couple of hundred miles south of Guatemala and southeastern Mexico by late Wednesday. Environmental conditions are forecast to be conducive for additional development, and a tropical depression is likely to form by late Thursday or early Friday while the system moves west-northwestward near or just offshore the coast of southern Mexico. * Formation chance through 48 hours...medium...60 percent. * Formation chance through 5 days...high...90 percent Link to comment Share on other sites More sharing options...
Windspeed Posted October 19, 2018 Share Posted October 19, 2018 We may have an interesting fujiwhara effect between two TCs in the EPAC developing near the Mexican coast in the coming days. The very small circulation of Tropical Storm Vicente spun up rather quickly this morning S of Guatemala and E of a strong northerly wind flow being funneled into the Gulf of Tehuantepec. Invest 99e is still slowly organizing further to the W and SW of the Mexican coast and will probably become TC Willa. If TS Vicente survives the Tehauntepec wind gap flow over the next 48 hours, modeling by both ECMWF and the GFS simulate possible interaction and play off both systems as they begin to pull N to NE in 5-7 days due to interaction with a mid-to-upper trough. In the meantime, if Vicente survives, it may continue W and NW to either get absorbed by an eventually stronger TC Willa that develops out of invest 99e, or be forced up into the Mexican coast to eventually phase with the resulting larger low pressure over the Gulf of California. Below is the 5 PM EDT discussion for Vicente and the 2 PM outlook for invest 99e. It will be interesting to see the wacky solutions by each of the OP model outputs versus eventual outcome as TCs in close proximity can have radically varied simulations in successive runs. Despite uncertainties on eventual intensities of either TC or their eventual points of landfall, there is increasing concern of severe life-threatening inland flooding over these mountainous coastal regions due to a steady feed of moist southerly flow and proximity to land. 000 WTPZ43 KNHC 192036 TCDEP3 Tropical Storm Vicente Discussion Number 2 NWS National Hurricane Center Miami FL EP232018 400 PM CDT Fri Oct 19 2018 Although tiny, the cyclone continues to display well-defined convective banding. The system's quick formation and small size make it difficult to have high confidence in its current intensity, and the various subjective and objective estimates range from T1.8/28 kt from the ADT to T3.0/45 kt from SAB. As a compromise, the intensity is set at 35 kt, which is closest to the TAFB estimate and the most recent SATCON number, and the depression is upgraded to Tropical Storm Vicente. As noted this morning, warm waters and low shear should induce further strengthening during the next 48 hours. On one hand, this intensification could be more than what is being indicated by the models, since small systems can have a tendency to gain strength quickly. On the other hand, Vicente will be interacting with a Gulf of Tehuantepec gap wind event during the next 48 hours, and the storm could end up ingesting some drier, more stable air into its circulation. The NHC intensity forecast favors the former scenario and is a little above the guidance envelope for the first 2-3 days. After day 3, an increase in shear, interaction with another possible tropical cyclone to the west, and possible interaction with land could all conspire to arrest the intensification trend, and weakening is expected by the end of the forecast period. It is also possible that Vicente could dissipate before the end of the 5-day period. This scenario is reminiscent of, and has similarities to, the interaction of Tropical Storm Ileana and Hurricane John back in early August. Vicente is moving very slowly northwestward, or 305/2 kt. The track models are indicating that the ongoing gap winds over the Gulf of Tehuantepec may have a greater influence of Vicente than previously thought, forcing the storm to turn west-southwestward in the next 24-48 hours. After 48 hours, Vicente should gradually enter the flow between mid-level ridging over Mexico and low pressure west of Mexico, causing it to turn back to the west and northwest on days 3 through 5. The new NHC track forecast is not too different from the morning forecast during that period, and it's closest to the paths shown by the GFS, HCCA, and FSSE guidance, which would bring the center close to the coast of Mexico later in the forecast period. There are considerable speed differences, however, and the NHC forecast splits the difference between the fast ECMWF solution and the slow GFS scenario. Even though Vicente should begin to slowly pull away from the coast tonight and on Saturday, heavy rainfall, with possible life-threatening flash flooding, is expected over portions of El Salvador, Guatemala, and southeastern Mexico during the next few days. FORECAST POSITIONS AND MAX WINDS INIT 19/2100Z 13.3N 92.2W 35 KT 40 MPH 12H 20/0600Z 13.6N 93.3W 45 KT 50 MPH 24H 20/1800Z 13.3N 94.2W 50 KT 60 MPH 36H 21/0600Z 12.9N 95.2W 55 KT 65 MPH 48H 21/1800Z 12.7N 96.5W 55 KT 65 MPH 72H 22/1800Z 13.7N 99.8W 55 KT 65 MPH 96H 23/1800Z 16.5N 103.0W 55 KT 65 MPH 120H 24/1800Z 20.0N 106.0W 45 KT 50 MPH $$ Forecaster Berg Showers and thunderstorms associated with an area of low pressure centered a few hundred miles south-southwest of Zihuatanejo, Mexico, are gradually becoming better organized. Environmental conditions are expected to become increasingly favorable for further development, and a tropical depression is expected to form later today or tomorrow while the low moves west-northwestward at about 10 mph, well offshore of the coast of southwestern Mexico. * Formation chance through 48 hours...high...80 percent. * Formation chance through 5 days...high...90 percent. Link to comment Share on other sites More sharing options...
Windspeed Posted October 19, 2018 Share Posted October 19, 2018 Here is the most recent ECMWF (10/19 12z) that resolves both systems quite well. Note how fast the small vortex of Vicente gets driven NNW up the coastline ahead of the larger and stronger vortex of Hurricane Willa: Link to comment Share on other sites More sharing options...
Windspeed Posted October 20, 2018 Share Posted October 20, 2018 000 WTPZ44 KNHC 201446 TCDEP4 Tropical Storm Willa Discussion Number 2 NWS National Hurricane Center Miami FL EP242018 1000 AM CDT Sat Oct 20 2018 A GMI microwave pass over the depression at 0916 UTC revealed that a tight inner core has developed, with a cyan and pink ring noted in the low-level 37-GHz channel. Outer convective banding has also been increasing, and a consensus of the latest subjective and objective satellite intensity estimates supports raising the maximum winds to 35 kt and designating the cyclone as Tropical Storm Willa. On an historical note, this is the first time that at least 21 named storms have formed within the eastern Pacific basin since the 1992 season. The microwave data suggest that Willa's center is a little farther south than previously estimated, and the initial motion is calculated to be westward, or 270/8 kt. The storm is already located near the western periphery of a mid-level ridge which extends across northern and central Mexico, and Willa is expected to slowly recurve around the ridge axis during the next 4 days. By the end of the forecast period, a mid-latitude trough located over the western U.S. is likely to cause Willa to accelerate toward the northeast in the direction of mainland Mexico. All of the track models agree on this general scenario, but there are some differences on how wide a turn Willa makes while it recurves. There are also some speed differences that appear to be related to how strong Willa will be when the mid-latitude trough becomes the main steering driver. The NHC forecast is very close to the previous forecast during the first 48 hours. After that time, the forecast has been nudged eastward since the GFS and ECMWF models are both near or east of the multi-model consensus aids. With a low-level ring already observed in microwave imagery, and Willa located in an environment of low shear and over very warm ocean water, the cyclone appears poised to go through a period of rapid intensification (RI). Several of the various RI indices are over 50 percent, and thus the NHC forecast favors the high end of the intensity guidance and explicitly shows rapid strengthening over the next 48 hours. Willa is expected to be moving more slowly by days 3 and 4 (about 3 kt), and upwelling of colder water could induce some weakening by that time. An increase in shear is likely to cause more significant weakening by the end of the forecast period. The new NHC intensity forecast is a bit higher than the previous forecast to account for the possibility of rapid intensification, and it shifts Willa's expected peak intensity about a day earlier. FORECAST POSITIONS AND MAX WINDS INIT 20/1500Z 14.8N 105.7W 35 KT 40 MPH 12H 21/0000Z 15.0N 106.5W 50 KT 60 MPH 24H 21/1200Z 15.3N 107.3W 65 KT 75 MPH 36H 22/0000Z 15.8N 107.9W 80 KT 90 MPH 48H 22/1200Z 16.6N 108.5W 95 KT 110 MPH 72H 23/1200Z 17.7N 109.0W 100 KT 115 MPH 96H 24/1200Z 19.0N 109.0W 90 KT 105 MPH 120H 25/1200Z 22.0N 107.5W 75 KT 85 MPH $$ Forecaster Berg Link to comment Share on other sites More sharing options...
bluewave Posted October 20, 2018 Share Posted October 20, 2018 The 2018 Northeast Pacific (to 180°) #hurricane season has now set the record for most seasonal Accumulated Cyclone Energy for the NE Pacific basin - breaking the old record set in 1992. #Vicente #Willapic.twitter.com/nWwVLT5ibU 12:10 PM - 20 Oct 2018 from Santa Rosa, CA NE Pacific hurricane data is considered reliable since 1971. Prior to that time, a considerable number of storms were likely missed due to lack of satellite data. 12:19 PM - 20 Oct 2018 from Santa Rosa, CA Link to comment Share on other sites More sharing options...
Windspeed Posted October 20, 2018 Share Posted October 20, 2018 TS Willa is establishing a tight inner core with nice symmetrical radial anticyclonic outflow aloft. Expect hurricane intensity by daybreak Sunday and rapid intensification into Monday. Willa will be an intense major hurricane before making the forecasted NE turn. Link to comment Share on other sites More sharing options...
hlcater Posted October 20, 2018 Share Posted October 20, 2018 Link to comment Share on other sites More sharing options...
Windspeed Posted October 21, 2018 Share Posted October 21, 2018 000 WTPZ44 KNHC 210232 TCDEP4 Tropical Storm Willa Discussion Number 4 NWS National Hurricane Center Miami FL EP242018 900 PM MDT Sat Oct 20 2018 Willa has rapidly intensified since genesis occurred last night, and it is almost a hurricane. Geostationary satellite and microwave images indicate that banding features have become well established in all quadrants and the inner core has continued to organize. There is still no evidence of an eye feature, however. A blend of the latest satellite intensity estimates supports increasing the initial wind speed to 60 kt. The latest satellite fixes indicate that Willa is now moving northwestward at about 5 kt. The storm is expected to gradually turn to the right as it moves around the western periphery of a mid-level ridge. In response, a northwestward motion should continue for another day or so, followed by a turn toward the north on Monday. After that time, a faster north-northeast to northeast motion is expected when a shortwave trough approaches the system. The latest model guidance, except for the UKMET, show Willa making a sharper northward turn and at a faster pace. The NHC track forecast has been adjusted accordingly to be in better agreement with the latest consensus aids. This forecast is again faster than the previous one and shows Willa making landfall over west-central Mexico in 72 to 96 hours. The storm has taken advantage of near ideal environmental conditions of very low wind shear, high levels of moisture, and warm 29 deg C SSTs. These conditions are expected to prevail for another couple of days, and that should allow Willa to continue to strengthen rapidly. In fact, the SHIPS Rapid Intensification (RI) indices show about 90 percent chance of RI continuing during the next 24 hours. Based on this information and the latest model guidance, the NHC intensity forecast shows Willa becoming a major hurricane in a day or so. Some weakening is likely before Willa reaches the coast due to an increase in shear and a decrease in available moisture, but Willa is forecast to be a hurricane when it reaches the coastline. After landfall, rapid weakening is expected due to interaction with the rugged terrain. FORECAST POSITIONS AND MAX WINDS INIT 21/0300Z 15.7N 106.1W 60 KT 70 MPH 12H 21/1200Z 16.1N 106.6W 80 KT 90 MPH 24H 22/0000Z 16.9N 107.1W 95 KT 110 MPH 36H 22/1200Z 17.7N 107.5W 110 KT 125 MPH 48H 23/0000Z 18.7N 107.8W 110 KT 125 MPH 72H 24/0000Z 20.7N 107.3W 90 KT 105 MPH 96H 25/0000Z 24.1N 104.2W 35 KT 40 MPH...INLAND 120H 26/0000Z...DISSIPATED $$ Forecaster Cangialosi Link to comment Share on other sites More sharing options...
Windspeed Posted October 21, 2018 Share Posted October 21, 2018 Willa has developed a pinehole eye. Should be upgraded next advisory. I may end up wrong here, but Willa is likely to outperform model intensity guidance. Low shear, small core and high OHC. It has a good 36-48 hrs remaining before increasing SW flow could impart any shear. Really the only thing stopping this from reaching maximum potential through Monday would be the onset of an ERC that takes too long. But ERCs can also be fast and result in a more stable eyewall versus an original tiny core like Willa's. Edit: Pinhole, not Pinehole. lol.. Link to comment Share on other sites More sharing options...
Windspeed Posted October 21, 2018 Share Posted October 21, 2018 NHC is forecasting a Cat 4 now. It should be weakening prior to landfall though. Perhaps even falling below Cat 2 by the time Willa's core reaches the Mexican coast as some of the intensity modeling suggests. However, faster motion and track perpendicular to coastline could allow Willa to maintain major status into landfall. The states of Colima, Jalisco and Nayarit are all a mountainous/volcanic coastal region and too much land interaction there can significantly disrupt low-level inflow of a slow moving hurricane, especially a more adjacent track to the shoreline. Ultimately, landfall intensity will depend on trough interaction and trajectory of track versus the coastline. The eventual capture by the trough and NE motion may give Willa enough forward motion to the NE to avoid its own upwelling, but at the same time, strong southwesterly upper level flow may inflict increasing shear. 000 WTPZ44 KNHC 211443 TCDEP4 Hurricane Willa Discussion Number 6 NWS National Hurricane Center Miami FL EP242018 900 AM MDT Sun Oct 21 2018 First-light GOES-16 visible satellite imagery shows that Willa continues to become better organized, with a tightly coiled band of convection wrapping around the center. There has also been evidence of a small eye in recent microwave and infrared satellite pictures. Subjective and objective satellite intensity estimates range from 77 kt to 90 kt, and the initial intensity has been increased to 85 kt for this advisory. Willa is moving northwestward or 325/6 kt. The track guidance continues to indicate that Willa will move northwestward today, then turn northward on Monday, and then head north-northeastward on Tuesday between a deep-layer ridge that extends westward from the Gulf of Mexico and an approaching mid-level trough. The dynamical model guidance remains in good overall agreement on this scenario, but there are differences in how quickly Willa will accelerate north-northeastward. The UKMET and ECMWF are much slower than the remainder of the dynamical models, with the GFS and GFS ensemble mean the fastest. The NHC track forecast brings the center of the Willa onshore of the coast of southwestern Mexico within 72 h, and it lies closest to the HFIP corrected consensus, which is a little faster than the other consensus aids. The hurricane is expected to remain within low vertical wind shear and over warm waters of around 28 degrees Celsius during the next day or two. These very favorable conditions are expected to allow steady to rapid strengthening through Monday night, and the NHC forecast is near the upper end of the intensity guidance. By 48 hours, increasing southwesterly shear is forecast to initiate weakening, but Willa is likely to remain a very strong hurricane through landfall in southwestern Mexico. After landfall, rapid weakening and dissipation over the mountainous terrain of mainland Mexico should occur. Key Messages: 1. Willa is forecast to be a hurricane when it reaches the coast of southwestern mainland Mexico by late Tuesday or Wednesday bringing a life-threatening storm surge, dangerous winds, and life-threatening flash flooding, and hurricane and tropical storm watches are now in effect for a portion of the area. Residents in the watch areas should monitor the progress of this system and follow any advice given by local officials. FORECAST POSITIONS AND MAX WINDS INIT 21/1500Z 16.6N 106.7W 85 KT 100 MPH 12H 22/0000Z 17.2N 107.2W 95 KT 110 MPH 24H 22/1200Z 18.2N 107.6W 110 KT 125 MPH 36H 23/0000Z 19.3N 107.7W 120 KT 140 MPH 48H 23/1200Z 20.4N 107.5W 110 KT 125 MPH 72H 24/1200Z 23.3N 105.5W 80 KT 90 MPH...INLAND 96H 25/1200Z 26.5N 101.0W 20 KT 25 MPH...POST-TROP/INLAND 120H 26/1200Z...DISSIPATED $$ Forecaster Brown Link to comment Share on other sites More sharing options...
Amped Posted October 21, 2018 Share Posted October 21, 2018 Willa just exploded to a T7.0!!!!!!!!!!! Link to comment Share on other sites More sharing options...
David Reimer Posted October 21, 2018 Share Posted October 21, 2018 Link to comment Share on other sites More sharing options...
Windspeed Posted October 21, 2018 Share Posted October 21, 2018 That's definitely a well-developed major hurricane. Though the explosive deepening was expected, it's still crazy to watch such rapid intensification unfold. Link to comment Share on other sites More sharing options...
Amped Posted October 22, 2018 Share Posted October 22, 2018 Quote SUMMARY OF 900 PM MDT...0300 UTC...INFORMATION ---------------------------------------------- LOCATION...17.7N 107.2W ABOUT 210 MI...340 KM SSW OF CABO CORRIENTES MEXICO MAXIMUM SUSTAINED WINDS...145 MPH...230 KM/H PRESENT MOVEMENT...NNW OR 340 DEGREES AT 7 MPH...11 KM/H MINIMUM CENTRAL PRESSURE...941 MB...27.79 INCHES Concervative estimate especially with the SLP. Willa has a chance of beating Micheals intensity over open water. HWRF shows it weakening quite a bit on final approach to land. Link to comment Share on other sites More sharing options...
Windspeed Posted October 22, 2018 Share Posted October 22, 2018 000 WTPZ44 KNHC 220232 TCDEP4 Hurricane Willa Discussion Number 8 NWS National Hurricane Center Miami FL EP242018 900 PM MDT Sun Oct 21 2018 Willa has continued to rapidly intensify this evening. Satellite images show a well-defined circular eye with a surrounding ring of cold cloud tops that are near -80 deg C over the southeastern quadrant. The initial intensity is set to 125 kt, which is near the latest Dvorak ADT estimates from CIMSS at the University of Wisconsin. Willa has strengthened at an incredible rate since genesis, intensifying from a tropical depression to a category 4 hurricane in less than 48 hours. Willa is gradually turning toward the right, with the initial motion estimated to be 340/6 kt. The hurricane is expected to turn northward on Monday as it moves around the western periphery of a mid-level ridge to the east, followed by a faster northeastward motion Monday night and Tuesday when a shortwave trough approaches the system. The models are in fairly good agreement, and only small changes were made to the previous NHC track forecast. On the forecast track, Willa is expected to move over Las Islas Marias on Tuesday and then move inland over southwestern and west-central Mexico Tuesday night or early Wednesday. The hurricane has certainty taken advantage of the near ideal environmental conditions and since these conditions will persist a little longer, some additional strengthening is shown in the short term. However, some fluctuations in intensity could occur due to eyewall replacement cycles. The models then show a gradual increase in shear and a decrease in available moisture around 24 hours, and these factors should cause a slow weakening trend. Regardless, Willa is forecast to remain a dangerous hurricane, bringing multiple life-threatening hazards to the coast of Mexico. Rapid weakening is forecast after the system moves inland and interacts with the mountainous terrain. The NHC intensity forecast lies near the high end of the model guidance through dissipation. Key Messages: 1. Willa is forecast to be a dangerous hurricane when it reaches the Islas Marias and the coast of southwestern Mexico by late Tuesday or Wednesday bringing a life-threatening storm surge and flash flooding along with damaging hurricane-force winds. A Hurricane Warning is in effect for these areas, and residents should rush preparations to completion to protect life and property and follow any advice given by local officials. FORECAST POSITIONS AND MAX WINDS INIT 22/0300Z 17.7N 107.2W 125 KT 145 MPH 12H 22/1200Z 18.6N 107.4W 135 KT 155 MPH 24H 23/0000Z 19.7N 107.5W 125 KT 145 MPH 36H 23/1200Z 20.7N 107.2W 115 KT 130 MPH 48H 24/0000Z 22.1N 106.2W 100 KT 115 MPH 72H 25/0000Z 26.2N 101.3W 30 KT 35 MPH...POST-TROP/INLAND 96H 26/0000Z...DISSIPATED $$ Forecaster Cangialosi Link to comment Share on other sites More sharing options...
Windspeed Posted October 22, 2018 Share Posted October 22, 2018 Willa may be in a state of weakening upon landfall, but it may still be a major hurricane. It's going to be close. Either way it will be a strong impact nonetheless. Link to comment Share on other sites More sharing options...
hlcater Posted October 22, 2018 Share Posted October 22, 2018 I'd say this is probably nearing Cat 5 intensity at this point. I personally think it's probably 135kts or so at the moment. This core configuration is one very intense cyclones possess and I've seen similar satellite presentations achieve 150+kts. (I'd say Cyclone Winston in the South Pac is a decent example) -75*C all the way around the eye as it continues to warm and clear out. Just seems this sort of presentation is almost always found to have winds in excess of 130kts at a minimum. Link to comment Share on other sites More sharing options...
hlcater Posted October 22, 2018 Share Posted October 22, 2018 An addendum to the above post, the shedding of the robust outer bands over the past few hours is likely helping the storm and heralding further intensification. Allowing the storm to further consolidate itself and concentrate all of its energy in the very compact core. Yet another thing I've seen very intense storms do as they intensify, and I can easily see why. Having too much going on outside the core probably messes with angular momentum, slowing the circulation and preventing the storm from reaching those higher intensities as easily as it would without them. Link to comment Share on other sites More sharing options...
shaggy Posted October 22, 2018 Share Posted October 22, 2018 Cloud tops are cooling rapidly again. If she is to make cat 5 the window if time is narrowing. Link to comment Share on other sites More sharing options...
jpeters3 Posted October 22, 2018 Share Posted October 22, 2018 Beautiful this morning. Best looking satellite presentation yet. Link to comment Share on other sites More sharing options...
jpeters3 Posted October 22, 2018 Share Posted October 22, 2018 140 kt / 925 hPa cat 5 in the 900 MDT update. 000 WTPZ44 KNHC 221447 TCDEP4 Hurricane Willa Discussion Number 10 NWS National Hurricane Center Miami FL EP242018 900 AM MDT Mon Oct 22 2018 Willa is an extremely impressive hurricane in infrared and visible satellite imagery this morning. The small, but very distinct, eye is embedded within a symmetric central dense overcast with cloud tops of -70 to -80 degrees Celsius. A very recent SSMIS microwave overpass is the first to indicate that an outer eyewall has formed, suggesting that an eyewall replacement cycle has started. The latest objective T-numbers from UW-CIMSS are T7.0/140 kt, and subjective Dvorak intensity estimates from TAFB and SAB are 140 kt and 127 kt, respectively. Based on these data the initial intensity has been increased to 140 kt. An Air Force Reserve Hurricane Hunter aircraft is currently en route to Wilma and should provide a better assessment of the storm's intensity by early this afternoon. Willa is moving northward 6 kt. The hurricane is forecast to continue to move northward today around the western flank of a deep-layer ridge that is located over the Gulf of Mexico. A short wave trough that is seen in water vapor imagery near 130W longitude is forecast to deepen as it moves eastward toward Baja California. This should cause Willa to turn north-northeastward tonight, then accelerate northeastward on Tuesday, bringing the center of the hurricane onshore along the west-central coast of Mexico Tuesday afternoon or evening. As mentioned in the previous advisory, the track guidance is good agreement on the overall scenario but there are still some notable differences in the predicted forward speed of the hurricane. The NHC track forecast leans toward the faster solutions of the GFS and GFS ensemble mean, which have been handling Willa's track the best so far. The environment of low wind shear and water temperatures of 28 to 29.5 degrees Celsius suggest some additional strengthening is possible but with the evidence that an eyewall replacement has begun, some fluctuations intensity are possible during the next 12 to 24 hours. After that time, increasing southwesterly shear is forecast to induce weakening, but Willa is likely to remain an extremely dangerous major hurricane when it makes landfall along the west-central coast of Mexico. After landfall, shear and the mountainous terrain of Mexico will cause rapid weakening and dissipation of the cyclone. Key Messages: 1. A life-threatening storm surge is expected Tuesday along the coasts of the Isla Marias, and west-central and southwestern Mexico near the path of Willa. Residents should rush preparations to completion to protect life and property and follow any advice given by local officials. 2. Everyone in Isla Marias, and within the hurricane warning area along coast of west-central Mexico should prepare for life- threatening major hurricane winds associated with the core of Michael. Hurricane force winds will also extend inland across the mountainous areas of west-central Mexico as Willa moves inland. 3. Heavy rainfall from Willa is likely to produce life-threatening flash flooding and landslides over much of southwestern and west-central Mexico. FORECAST POSITIONS AND MAX WINDS INIT 22/1500Z 19.1N 107.2W 140 KT 160 MPH 12H 23/0000Z 20.1N 107.2W 140 KT 160 MPH 24H 23/1200Z 21.4N 106.9W 135 KT 155 MPH 36H 24/0000Z 23.1N 105.6W 90 KT 105 MPH...INLAND 48H 24/1200Z 25.4N 102.5W 30 KT 35 MPH...INLAND 72H 25/1200Z...DISSIPATED $$ Forecaster Brown Link to comment Share on other sites More sharing options...
Amped Posted October 22, 2018 Share Posted October 22, 2018 1 hour ago, jpeters3 said: 140 kt / 925 hPa cat 5 in the 900 MDT update. 000 WTPZ44 KNHC 221447 TCDEP4 Hurricane Willa Discussion Number 10 NWS National Hurricane Center Miami FL EP242018 900 AM MDT Mon Oct 22 2018 Willa is an extremely impressive hurricane in infrared and visible satellite imagery this morning. The small, but very distinct, eye is embedded within a symmetric central dense overcast with cloud tops of -70 to -80 degrees Celsius. A very recent SSMIS microwave overpass is the first to indicate that an outer eyewall has formed, suggesting that an eyewall replacement cycle has started. The latest objective T-numbers from UW-CIMSS are T7.0/140 kt, and subjective Dvorak intensity estimates from TAFB and SAB are 140 kt and 127 kt, respectively. Based on these data the initial intensity has been increased to 140 kt. An Air Force Reserve Hurricane Hunter aircraft is currently en route to Wilma and should provide a better assessment of the storm's intensity by early this afternoon. Willa is moving northward 6 kt. The hurricane is forecast to continue to move northward today around the western flank of a deep-layer ridge that is located over the Gulf of Mexico. A short wave trough that is seen in water vapor imagery near 130W longitude is forecast to deepen as it moves eastward toward Baja California. This should cause Willa to turn north-northeastward tonight, then accelerate northeastward on Tuesday, bringing the center of the hurricane onshore along the west-central coast of Mexico Tuesday afternoon or evening. As mentioned in the previous advisory, the track guidance is good agreement on the overall scenario but there are still some notable differences in the predicted forward speed of the hurricane. The NHC track forecast leans toward the faster solutions of the GFS and GFS ensemble mean, which have been handling Willa's track the best so far. The environment of low wind shear and water temperatures of 28 to 29.5 degrees Celsius suggest some additional strengthening is possible but with the evidence that an eyewall replacement has begun, some fluctuations intensity are possible during the next 12 to 24 hours. After that time, increasing southwesterly shear is forecast to induce weakening, but Willa is likely to remain an extremely dangerous major hurricane when it makes landfall along the west-central coast of Mexico. After landfall, shear and the mountainous terrain of Mexico will cause rapid weakening and dissipation of the cyclone. Key Messages: 1. A life-threatening storm surge is expected Tuesday along the coasts of the Isla Marias, and west-central and southwestern Mexico near the path of Willa. Residents should rush preparations to completion to protect life and property and follow any advice given by local officials. 2. Everyone in Isla Marias, and within the hurricane warning area along coast of west-central Mexico should prepare for life- threatening major hurricane winds associated with the core of Michael. Hurricane force winds will also extend inland across the mountainous areas of west-central Mexico as Willa moves inland. 3. Heavy rainfall from Willa is likely to produce life-threatening flash flooding and landslides over much of southwestern and west-central Mexico. FORECAST POSITIONS AND MAX WINDS INIT 22/1500Z 19.1N 107.2W 140 KT 160 MPH 12H 23/0000Z 20.1N 107.2W 140 KT 160 MPH 24H 23/1200Z 21.4N 106.9W 135 KT 155 MPH 36H 24/0000Z 23.1N 105.6W 90 KT 105 MPH...INLAND 48H 24/1200Z 25.4N 102.5W 30 KT 35 MPH...INLAND 72H 25/1200Z...DISSIPATED $$ Forecaster Brown Great Typo Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.