Tropical Storm EDOUARD

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TROPICAL STORM EDOUARD DISCUSSION NUMBER   8
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL   AL052008
500 AM EDT TUE AUG 05 2008
 
WSR-88D DOPPLER RADAR DATA SHOW INCREASED ORGANIZATION OF THE STORM
OVERNIGHT.  SPIRAL BANDING FEATURES HAVE BECOME BETTER
DEFINED...HOWEVER THERE IS STILL NOT MUCH EVIDENCE OF AN EYEWALL. 
PEAK DOPPLER VELOCITIES WERE NEAR 65 KT AT ELEVATIONS OF 3000-5000
FT AND THE AIR FORCE HURRICANE HUNTER SFMR RECORDED SURFACE WINDS
OF 53 AND 56 KT OVER THE NORTHWEST QUADRANT IN AN AREA OF VERY
HEAVY RAIN.  ADDITIONALLY...THE 850 MB FLIGHT LEVEL WINDS FROM THE
HURRICANE HUNTERS WERE 68 KT OVER THE SAME AREA...CORRESPONDING TO
A SURFACE WIND SPEED OF 54 KT.  THEREFORE THE CURRENT INTENSITY IS
NOW ESTIMATED TO BE 55 KT.  THE SOUTHWESTERN LOUISIANA COASTAL
WATERS HAVE A VERY HIGH SKIN TEMPERATURE BUT DO NOT HAVE A
PARTICULARLY HIGH OCEANIC HEAT CONTENT.  WATER VAPOR ANIMATION
SUGGESTS THAT THE VERTICAL SHEAR IS DECREASING AND UPPER-LEVEL
OUTFLOW IS INCREASING SO DYNAMICAL CONDITIONS APPEAR CONDUCIVE FOR
SOME ADDITIONAL INTENSIFICATION IN THE SHORT TIME REMAINING BEFORE
LANDFALL.  EDOUARD MIGHT STILL BECOME A HURRICANE BEFORE CROSSING
THE COAST BUT...AS NOTED EARLIER...THERE IS LITTLE PRACTICAL
DIFFERENCE BETWEEN A STRONG TROPICAL STORM AND A LOW-END
HURRICANE.  THE INTENSITY FORECAST FOLLOWS THE DECAY-SHIPS GUIDANCE
RATHER CLOSELY.
 
AIRCRAFT AND RADAR FIXES SHOW THAT THE MOTION IS A LITTLE FASTER AND
TO THE RIGHT OF THE PREVIOUS ESTIMATE...AND IS NOW 300/10.  THE
STEERING FLOW FOR EDOUARD IS BEING PROVIDED BY A MID-TROPOSPHERIC
ANTICYCLONE NEAR THE LOWER PORTION OF THE MISSISSIPPI VALLEY.  THIS
SYNOPTIC PATTERN WILL PERSIST DURING AT LEAST THE NEXT 12
HOURS...BRINGING THE CENTER OF THE TROPICAL CYCLONE INLAND WITHIN
THE WARNING AREA LATER TODAY.  BASED ON THE CURRENT MOTION WHICH IS
A LITTLE MORE TO THE NORTH THAN EARLIER...THE OFFICIAL FORECAST IS
SHIFTED A BIT TO THE RIGHT OF THE PREVIOUS TRACK AND IS JUST A
LITTLE TO THE NORTH OF THE DYNAMICAL MODEL CONSENSUS.
 
FORECAST POSITIONS AND MAX WINDS
 
INITIAL      05/0900Z 29.3N  93.4W    55 KT
 12HR VT     05/1800Z 30.1N  95.1W    55 KT...INLAND
 24HR VT     06/0600Z 31.0N  97.2W    35 KT...INLAND
 36HR VT     06/1800Z 31.9N  99.3W    30 KT...INLAND
 48HR VT     07/0600Z 32.8N 101.3W    25 KT...REMNANT LOW
 72HR VT     08/0600Z...DISSIPATED
 
$$
FORECASTER PASCH
 
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