andyhb Posted August 28, 2012 Share Posted August 28, 2012 I know for a fact that station isn't anywhere near the inner eyewall feature, it's still in the outer eyewall. Pressure is dropping in that feature, however. Link to comment Share on other sites More sharing options...
phil882 Posted August 28, 2012 Share Posted August 28, 2012 Its obvious the inner vorticity that most of you have been tracking is rotating around the larger outer circulation that remains dominant (and should remain dominant). This feature has actually started shifting more westerly in the last 10 radar frames or so. Link to comment Share on other sites More sharing options...
mattmfm Posted August 28, 2012 Share Posted August 28, 2012 Pressure down to 970. Link to comment Share on other sites More sharing options...
HKY_WX Posted August 28, 2012 Share Posted August 28, 2012 I would disagree with that assessment. http://www.ndbc.noaa...&time_label=CDT Data from the above station shows a pronounced drop after the outer eyewall passed, with the 'inner' eyewall ramping things up considerably. Latest gusts in excess of 100 miles per hour. When Nikolai is excited, something is going down lol! Link to comment Share on other sites More sharing options...
SnowlieSnowstormson Posted August 28, 2012 Share Posted August 28, 2012 Center is now heading due west strafing the coast. Link to comment Share on other sites More sharing options...
battlebrick Posted August 28, 2012 Share Posted August 28, 2012 96 kts FL Link to comment Share on other sites More sharing options...
mattmfm Posted August 28, 2012 Share Posted August 28, 2012 Pilot's Station in the eye, wind's collapsing. http://www.ndbc.noaa.gov/show_plot.php?station=pstl1&meas=wspd&uom=E&time_diff=-5&time_label=CDT Link to comment Share on other sites More sharing options...
David Reimer Posted August 28, 2012 Share Posted August 28, 2012 96 kts FL SFMR values are still comparatively low with the highest around 67 knots. Link to comment Share on other sites More sharing options...
Ian Posted August 28, 2012 Share Posted August 28, 2012 Center is now heading due west strafing the coast. there's not much use in tracking the center in very short intervals.. it's almost always going to be somewhat irregular. Link to comment Share on other sites More sharing options...
Nikolai Posted August 28, 2012 Share Posted August 28, 2012 When Nikolai is excited, something is going down lol! Radar shows the inner eyewall feature becoming slightly better defined, and I think that should improve as the bulk of the convection continues rotating around to the N side of the storm... bad timing for New Orleans. Here's a link to the surge maps. http://www.wunderground.com/hurricane/LAMSALSurge.asp As you can see (click the ones for NOLA), if Isaac's surge is indeed of a Cat 2 strength (or even Cat 1), he has another 50-100 miles of 'open' water with the surge. Not deep, but enough to at least maintain strength. Link to comment Share on other sites More sharing options...
Camille>Katrina Posted August 28, 2012 Share Posted August 28, 2012 Definitely looks to be heading almost due north on radar the past hour. Yes it does looks like 350' NNW to me by this radar http://weather.cod.edu/satrad/nexrad/ right now doing the same thing alot of storms like to do kick right upon arrival to land.i wondered earlier today if this may occur Katrina did it at the same spot. Link to comment Share on other sites More sharing options...
David Reimer Posted August 28, 2012 Share Posted August 28, 2012 Latest visible shot zoomed in Link to comment Share on other sites More sharing options...
MGorse Posted August 28, 2012 Share Posted August 28, 2012 I would disagree with that assessment. http://www.ndbc.noaa...&time_label=CDT Data from the above station shows a pronounced drop after the outer eyewall passed, with the 'inner' eyewall ramping things up considerably. Latest gusts in excess of 100 miles per hour. Use these wind measurements with caution. There is a remark in their obs. KMIS 282255Z 17036G79KT M1/4SM FG OVC004 27/26 A2893 RMK A01 WIND DATA UNRELIABLE KMIS 282235Z 16058G84KT M1/4SM FG BKN004 BKN008 BKN021 26/25 A2892 RMK A01 WIND DATA UNRELIABLE Link to comment Share on other sites More sharing options...
Superstorm93 Posted August 28, 2012 Share Posted August 28, 2012 Drastic improvement today. Isaac has become much more symmetrical and outflow has become excellent on the eastern side. Link to comment Share on other sites More sharing options...
Ian Posted August 28, 2012 Share Posted August 28, 2012 Use these wind measurements with caution. There is a remark in their obs. KMIS 282255Z 17036G79KT M1/4SM FG OVC004 27/26 A2893 RMK A01 WIND DATA UNRELIABLE KMIS 282235Z 16058G84KT M1/4SM FG BKN004 BKN008 BKN021 26/25 A2892 RMK A01 WIND DATA UNRELIABLE nobody seems to be able to answer why that's there. is it because it's so high off the ground or because it's faulty? Link to comment Share on other sites More sharing options...
mattmfm Posted August 28, 2012 Share Posted August 28, 2012 Winds already gusting to 58mph in New Orleans. Link to comment Share on other sites More sharing options...
Buckeye05 Posted August 28, 2012 Share Posted August 28, 2012 The small inner eyewall looks to be expanding and strengthening. Link to comment Share on other sites More sharing options...
turtlehurricane Posted August 28, 2012 Share Posted August 28, 2012 Lake Pontchartrain fully up to the levee in New Orleans now. Today's Darwin award winner. Link to comment Share on other sites More sharing options...
wxsniss Posted August 28, 2012 Share Posted August 28, 2012 While David's taking a break... Product: Air Force Vortex Message (URNT12 KNHC) Transmitted: 28th day of the month at 22:54Z Corrected: This observation corrected a previous observation. Aircraft: Air Force Aircraft (Last 3 digits of the tail number are 308) Storm Number & Year: 09L in 2012 Storm Name: Isaac (flight in the North Atlantic basin) Mission Number: 32 Observation Number: 02 A. Time of Center Fix: 28th day of the month at 22:25:50Z B. Center Fix Coordinates: 28°52'N 89°07'W (28.8667N 89.1167W) (View map) B. Center Fix Location: 95 miles (153 km) to the SE (143°) from New Orleans, LA, USA. C. Minimum Height at Standard Level: 1,178m (3,865ft) at 850mb D. Estimated (by SFMR or visually) Maximum Surface Wind: 61kts (~ 70.2mph) E. Location of the Estimated Maximum Surface Wind: 56 nautical miles (64 statute miles) to the WSW (237°) of center fix F. Maximum Flight Level Wind Inbound: From 325° at 84kts (From the NW at ~ 96.7mph) G. Location of Maximum Flight Level Wind Inbound: 59 nautical miles (68 statute miles) to the WSW (238°) of center fix H. Minimum Sea Level Pressure: 970mb (28.64 inHg) I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 15°C (59°F) at a pressure alt. of 1,532m (5,026ft) J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 21°C (70°F) at a pressure alt. of 1,523m (4,997ft) K. Dewpoint Temp (collected at same location as temp inside eye): 18°C (64°F) K. Sea Surface Temp (collected at same location as temp inside eye): Not Available L. Eye Character (Undecoded): SPIRAL BAND M. Eye Shape: Not Available 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: 84kts (~ 96.7mph) in the southwest quadrant at 22:07:00Z Maximum Flight Level Wind Outbound: 94kts (~ 108.2mph) in the northeast quadrant at 22:48:10Z Maximum Flight Level Temp: 22°C (72°F) which was observed 30 nautical miles (35 statute miles) to the SW (233°) from the flight level center Link to comment Share on other sites More sharing options...
BeauDodson Posted August 28, 2012 Share Posted August 28, 2012 Updated discussion https://nwschat.weather.gov/p.php?pid=201208282302-KLCH-FXUS64-AFDLCH ...HURRICANE ISAAC NEARING THE SOUTHEAST LOUISIANA COAST... .DISCUSSION... ISAAC HAS GRADUALLY BECOME BETTER ORGANIZED AND IT STRENGTHENED A BIT EARLIER TODAY...BUT IT CONTINUES TO BATTLE SURROUNDING ENVIRONMENTAL DRY AIR...WHICH WAS QUITE EVIDENT ON THE 12Z KLCH RAOB. THE FORECAST TRACK BRINGS THE CYCLONE INLAND OVER SOUTHEAST LOUISIANA NEAR THE MOUTH OF THE MS RIVER AROUND MIDNIGHT TONIGHT...THEN CONTINUES A RATHER SLOW NORTHWEST TO WEST-NORTHWEST MOTION WEDNESDAY AND WEDNESDAY NIGHT. Link to comment Share on other sites More sharing options...
jasons Posted August 28, 2012 Share Posted August 28, 2012 Lake Pontchartrain fully up to the levee in New Orleans now. It's up to the base of the levee, not the top. The levee is the green band running between the flooded parking lot and the buildings you see on the far right. It rises several feet above still. Link to comment Share on other sites More sharing options...
DaculaWeather Posted August 28, 2012 Share Posted August 28, 2012 nobody seems to be able to answer why that's there. is it because it's so high off the ground or because it's faulty? Because it's not quality controlled. Link to comment Share on other sites More sharing options...
MGorse Posted August 28, 2012 Share Posted August 28, 2012 nobody seems to be able to answer why that's there. is it because it's so high off the ground or because it's faulty? I am not exactly sure. The only thing I see on the NDBC site is that it states "Data from this station are not quality controlled by NDBC". Probably that, and also the wind measurements are nearly 300 feet above the site elevation. Link to comment Share on other sites More sharing options...
EasternUSWX Posted August 28, 2012 Share Posted August 28, 2012 Center on radar seems to have turned west if not west south west. If this stays offshore it might be a long night. Link to comment Share on other sites More sharing options...
Snow_Miser Posted August 28, 2012 Share Posted August 28, 2012 Center on radar seems to have turned west if not west south west. If this stays offshore it might be a long night. As Ian mentioned earlier, short term trends should not be representative of the overall motion, and slight wobbles are very typical of a Tropical Cyclone. What should be interesting though is if this wobble turns into a trend. Link to comment Share on other sites More sharing options...
FredRed Posted August 28, 2012 Share Posted August 28, 2012 Awesome! Link to comment Share on other sites More sharing options...
HKY_WX Posted August 28, 2012 Share Posted August 28, 2012 Wow that tower over the center is blowing up on IR. It's pretty cool to be seeing what we normally see out in the deep atlantic happening on Ir and radar at the same time. The forming new eyewall and corresponding IR tops. Link to comment Share on other sites More sharing options...
left_gulley Posted August 28, 2012 Share Posted August 28, 2012 This is the most impressive loop I've seen yet. It really shows the expansive outflow and recent explosion of convection over the center. http://www.nrlmry.na...IM_TYPE=Instant Link to comment Share on other sites More sharing options...
NJDEVIL Posted August 28, 2012 Share Posted August 28, 2012 The band just to the north of the center should produce some serious wind gusts, it has really intensified over the last few radar frames. Link to comment Share on other sites More sharing options...
Ian Posted August 28, 2012 Share Posted August 28, 2012 Awesome! The IR presentation is as good as it's looked but it's not great... there are still some structural issues/dry air working in... more apparent than on vis. Link to comment Share on other sites More sharing options...
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