CoastalWx Posted August 28, 2012 Share Posted August 28, 2012 Pretty close. I measured the widest dimension, from WSW to ENE, and it is 84nm there. Looking at single site radar, I think you can shrink that more. The center is trying to get a bit more organized. Link to comment Share on other sites More sharing options...
mattmfm Posted August 28, 2012 Share Posted August 28, 2012 89.8mph wind gust just recorded at an Apache Corp oil platform about 300ft above ocean level. (80mi SE of NOLA) http://www.ndbc.noaa.gov/station_page.php?station=KMIS Link to comment Share on other sites More sharing options...
Big Jims Videos Posted August 28, 2012 Share Posted August 28, 2012 on the last few velocity scans, the eastern eye wall appears to be closing off and the entire eye contracting. I'm looking at the velocity, not the reflectivity. Interesting seeing the wind speeds suddenly show up on the open side. Link to comment Share on other sites More sharing options...
dan11295 Posted August 28, 2012 Share Posted August 28, 2012 Guess big question is whether Isaac moves like the current NHC forecast on steady NW heading or moves west along the coast. like the GFS. Based on ILX and MOB velocity data movement is still NW for now. Link to comment Share on other sites More sharing options...
David Reimer Posted August 28, 2012 Share Posted August 28, 2012 Product: Air Force Vortex Message (URNT12 KNHC) Transmitted: 28th day of the month at 17:33Z Aircraft: Air Force Aircraft (Last 3 digits of the tail number are 306) Storm Number & Year: 09L in 2012 Storm Name: Isaac (flight in the North Atlantic basin) Mission Number: 31 Observation Number: 19 A. Time of Center Fix: 28th day of the month at 16:48:50Z B. Center Fix Coordinates: 28°22'N 88°36'W (28.3667N 88.6W) B. Center Fix Location: 142 miles (228 km) to the SE (142°) from New Orleans, LA, USA. C. Minimum Height at Standard Level: 1,222m (4,009ft) at 850mb D. Estimated (by SFMR or visually) Maximum Surface Wind: 66kts (~ 76.0mph) E. Location of the Estimated Maximum Surface Wind: 44 nautical miles (51 statute miles) to the NE (55°) of center fix F. Maximum Flight Level Wind Inbound: From 145° at 89kts (From the SE at ~ 102.4mph) G. Location of Maximum Flight Level Wind Inbound: 53 nautical miles (61 statute miles) to the NE (54°) of center fix H. Minimum Sea Level Pressure: 975mb (28.79 inHg) I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 17°C (63°F) at a pressure alt. of 1,443m (4,734ft) J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 23°C (73°F) at a pressure alt. of 1,524m (5,000ft) K. Dewpoint Temp (collected at same location as temp inside eye): 20°C (68°F) K. Sea Surface Temp (collected at same location as temp inside eye): Not Available L. Eye Character (Undecoded): SPIRAL BAND M. Eye Shape: Elliptical (oval shaped) M. Orientation of Major Axis in Elliptical Eye: 110° to 290° (ESE to WNW) M. Length of Major Axis in Elliptical Eye: 70 nautical miles (81 statute miles) M. Length of Minor Axis in Elliptical Eye: 60 nautical miles (69 statute miles) N. Fix Determined By: Penetration, Radar, Wind, Pressure and Temperature N. Fix Level: 850mb O. Navigation Fix Accuracy: 0.02 nautical miles O. Meteorological Accuracy: 1 nautical mile Remarks Section: Maximum Flight Level Wind: 94kts (~ 108.2mph) in the east quadrant at 15:50:30Z Link to comment Share on other sites More sharing options...
CoastalWx Posted August 28, 2012 Share Posted August 28, 2012 6C difference is not bad. Better than it was earlier. Link to comment Share on other sites More sharing options...
Uncle Bobby Posted August 28, 2012 Share Posted August 28, 2012 Link to comment Share on other sites More sharing options...
NaoPos Posted August 28, 2012 Share Posted August 28, 2012 http://www.ssec.wisc.edu/data/1min/ Link to comment Share on other sites More sharing options...
LakeEffectKing Posted August 28, 2012 Share Posted August 28, 2012 L. Eye Character (Undecoded): SPIRAL BAND Very key as to why we have not seen any RI. Single, coiled, spiral bands take longer to transfer winds into the core as opposed to having a ring of convection with many "feeder" type bands "spiraling into" the ring core. From a geometric perspective, single spirals don't transfer vorticity nor thermodynamic feedbacks into the center very well. The 6C difference is nice, but it was 4C last night....so more evidence of just slow, methodical strengthening. Link to comment Share on other sites More sharing options...
Max Posted August 28, 2012 Share Posted August 28, 2012 I've been watching the trends of the possible future motion of Isaac and the HRRR is very interesting because it too has the slow west drift just south of the LA coast, but it actually turns it WSW and maybe even SW. Could this type of motion actually happen later today and tonight? Link to comment Share on other sites More sharing options...
Eskimo Joe Posted August 28, 2012 Share Posted August 28, 2012 Looks like we have an eye on the latest visible satellite. Link to comment Share on other sites More sharing options...
Ginx snewx Posted August 28, 2012 Share Posted August 28, 2012 Looks like we have an eye on the latest visible satellite. Nice Link to comment Share on other sites More sharing options...
Max Posted August 28, 2012 Share Posted August 28, 2012 Also looks like Isaac is doing a better job mixing out the dry air finally. Link to comment Share on other sites More sharing options...
wxsniss Posted August 28, 2012 Share Posted August 28, 2012 best microwave image in its lifetime: does this suggest a transition to a more circular core vs. the spiral band structure it has had for the past 24 hours? Link to comment Share on other sites More sharing options...
RGweathergeek Posted August 28, 2012 Share Posted August 28, 2012 Sounds like our local weather here in SE Texas is grabbing on to the westward drift of Issac. This morning they were saying mostly sunny and breezy tomorrow. The weather at noon was calling for cloudy and windy tomorrow with rain east of HOU, with a good chance of rain and wind tomorrow night over the entire Houston area. Considering the wind field we may see 30-35 MPH winds here tomorrow, especially if some of the western model trends hold. Link to comment Share on other sites More sharing options...
Eskimo Joe Posted August 28, 2012 Share Posted August 28, 2012 Where? I haven been watching this satellite loop / image viewer for a few hours. Link to comment Share on other sites More sharing options...
Radius Posted August 28, 2012 Share Posted August 28, 2012 A nice perspective: http://www.ssec.wisc.edu/~rabin/goes14/loop_srso.html Link to comment Share on other sites More sharing options...
A-L-E-K Posted August 28, 2012 Share Posted August 28, 2012 Microwave looks decent but I'm pretty confident Isaac will not be shaking the asymmetric convective behavior that continues to rotate around the eye feature. Link to comment Share on other sites More sharing options...
wxsmwhrms Posted August 28, 2012 Share Posted August 28, 2012 New 12Z ECMWF has shifted back a little east of its previous run. All models have it near over water for at least another 24-36 hours. Certainly doesn't look like it's going anywhere fast any time soon. Eyewall has just about completely closed off on KLIX radar now. Link to comment Share on other sites More sharing options...
wxsniss Posted August 28, 2012 Share Posted August 28, 2012 Euro drops to ~960mb, around Wednesday 12-15z, with a very slow landfall: Link to comment Share on other sites More sharing options...
Max Posted August 28, 2012 Share Posted August 28, 2012 The lowest pressure on the 12z Euro is actually sub 960mb at the 33h mark. Link to comment Share on other sites More sharing options...
Saturn510 Posted August 28, 2012 Share Posted August 28, 2012 Did the Euro initalize with the current presurre of Issac? Link to comment Share on other sites More sharing options...
FredRed Posted August 28, 2012 Share Posted August 28, 2012 Did the Euro initalize with the current presurre of Issac? It initialized at 979 vs a 977 VDM. Link to comment Share on other sites More sharing options...
wxsniss Posted August 28, 2012 Share Posted August 28, 2012 The lowest pressure on the 12z Euro is actually sub 960mb at the 33h mark. Did the Euro initalize with the current presurre of Issac? yeah not sure why no one is commenting, to debunk or otherwise... sub-960 mb is considerably more intense than the 0Z Euro, and depicts an even longer scraping along the southeast LA coast for 18Z 8/28 Euro had 972 mb vs. 975 mb extrap on 17:42Z VDM Link to comment Share on other sites More sharing options...
Michigander Posted August 28, 2012 Share Posted August 28, 2012 yeah not sure why no one is commenting, to debunk or otherwise... sub-960 mb is considerably more intense than the 0Z Euro, and depicts an even longer scraping along the southeast LA coast for 18Z 8/28 Euro had 972 mb vs. 975 mb extrap on 17:42Z VDM Would the sub-960 progged by the Euro imply a Cat 2 or higher? Link to comment Share on other sites More sharing options...
Max Posted August 28, 2012 Share Posted August 28, 2012 The eye on radar continues to shrink. I bet the next recon should find a pressure below 970mb if this continues before they get to the center. Link to comment Share on other sites More sharing options...
David Reimer Posted August 28, 2012 Share Posted August 28, 2012 Would the sub-960 progged by the Euro imply a Cat 2 or higher? Keep in mind that we've already broken a record for having the lowest pre-hurricane tropical storm pressure in history, so trying to correlate the pressure verses the wind field has proven futile. Considering the pressure is at 975 millibars with 75 MPH winds, it seems reasonable that we won't be seeing sustained winds over 90 MPH and even that is pushing it. However, if the "rubber band effect" of the low pressure and low wind field breaks and we get an inner core that can develop, winds may react a bit more. Isaac is almost out of time. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted August 28, 2012 Share Posted August 28, 2012 Eyewall almost looks completely wrapped around. Wind gust of 83 mph in the southwest quadrant of Isaac on one of the oil platforms. Sustained winds of 70 mph. Link to comment Share on other sites More sharing options...
Eskimo Joe Posted August 28, 2012 Share Posted August 28, 2012 Just noticed a wind report from the GOMEX with a gust to 83mph. Link to comment Share on other sites More sharing options...
LakeEffectKing Posted August 28, 2012 Share Posted August 28, 2012 On some of those 1 min/ 1km vis loops (amazing, BTW) you can see the subsidence really starting to take shape near the COC....I expect the delta T in/outside the eye to be nearing 10C in the next few hours..... Link to comment Share on other sites More sharing options...
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