5 am Discussion - 958mb
Posted by 1969 on 8/28/2011, 5:33 am
| HURRICANE IRENE DISCUSSION NUMBER 32 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011 500 AM EDT SUN AUG 28 2011  SATELLITE AND RADAR IMAGERY SHOW THAT DRY AIR IS NOW WRAPPING INTO MUCH OF THE SOUTHERN SEMICIRCLE OF IRENE...AND THE CYCLONE IS SLOWLY BEGINNING TO FILL AS MEASUREMENTS FROM THE AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT SHOW THAT THE CENTRAL PRESSURE IS UP TO 958 MB. BASED ON DROPSONDE AND SFMR DATA SHOWING THAT SURFACE WINDS HAVE CONTINUED TO SLOWLY WEAKEN...THE INITIAL INTENSITY IS LOWERED TO 65 KT FOR THIS ADVISORY. DESPITE THE GRADUAL WEAKENING OF THE CYCLONE...THE OUTER WIND FIELD CONTINUES TO EXPAND...WITH 34-KT WINDS OCCURRING FROM NEW YORK CITY SOUTHWARD TO NORTHEASTERN NORTH CAROLINA. IRENE IS EXPECTED TO REMAIN NEAR HURRICANE STRENGTH UNTIL IT MOVES INTO SOUTHERN NEW ENGLAND LATER TODAY... AND IT WILL ONLY TAKE MODEST CONVECTION TO BRING DOWN STRONGER WINDS ALOFT TO THE SURFACE AS SUSTAINED HURRICANE-FORCE WINDS OR GUSTS. SLOW WEAKENING IS EXPECTED AFTER LANDFALL AS IRENE BECOMES A POST-TROPICAL CYCLONE IN ABOUT 24 HOURS. A note for those in tall buildings NOTE...MORE SO THAN WITH MOST STORMS...THE WINDS WITH IRENE INCREASE SHARPLY WITH HEIGHT ABOVE THE SURFACE. AS IRENE MOVES THROUGH AREAS WITH HIGH-RISE STRUCTURES...THESE BUILDINGS COULD EXPERIENCE WINDS SIGNIFICANTLY STRONGER THAN THE SURFACE WINDS. WINDS AT THE 30-STORY LEVEL WILL LIKELY BE 20 PERCENT HIGHER THAN AT THE SURFACE...AND WINDS 80-100 STORIES UP COULD BE ABOUT 30 PERCENT HIGHER THAN AT THE SURFACE. |
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- Re: 5 am Discussion - 958mb - Target, 8/28/2011, 6:11 am
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