Tropical Storm Andrea - Discussion 1

By: National Hurricane Center
By: National Hurricane Center

TROPICAL STORM ANDREA SPECIAL DISCUSSION NUMBER 1
NWS NATIONAL HURRICANE CENTER MIAMI FL AL012013
600 PM EDT WED JUN 05 2013

THE AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT INVESTIGATING THE
LARGE AREA OF DISTURBED WEATHER OVER THE EASTERN GULF OF MEXICO HAS
FOUND A CIRCULATION CENTER LOCATED NEAR THE WESTERN EDGE OF THE
LARGE MASS OF THUNDERSTORMS. THIS CENTER APPEARS TO HAVE FORMED
VERY RECENTLY SO THE INITIAL MOTION ESTIMATE IS UNCERTAIN.
THE AIRCRAFT MEASURED AN EXTRAPOLATED SURFACE PRESSURE OF 1002
MB...PEAK 1000 FT FLIGHT-LEVEL WINDS OF 47 KT...AND BELIEVABLE
BIAS-CORRECTED SFMR SURFACE WINDS OF AROUND 35 KT. THESE DATA
SUPPORT AN INITIAL INTENSITY OF 35 KT. STRONG SOUTHWESTERLY SHEAR
IS EXPECTED TO CONTINUE DURING THE NEXT COUPLE OF DAYS AND
SIGNIFICANT STRENGTHENING APPEARS UNLIKELY. THE INTENSITY FORECAST
SHOWS LITTLE OVERALL CHANGE IN STRENGTH...EVEN AFTER THE SYSTEM
BECOMES EXTRATROPICAL IN 2 TO 3 DAYS.

ANDREA IS FORECAST TO MOVE SLOWLY NORTHWARD TONIGHT...THEN
ACCELERATE NORTHEASTWARD ON THURSDAY AHEAD OF A MID- TO UPPER-LEVEL
TROUGH MOVING INTO THE SOUTHEASTERN UNITED STATES. THE GLOBAL
MODELS ARE IN GOOD AGREEMENT ON THIS GENERAL SCENARIO...ALTHOUGH
THEY ALSO SUGGEST THE POSSIBILITY OF JUMPS OR REFORMATIONS OF THE
CENTER DURING THE NEXT 24 HOURS. LANDFALL ALONG THE COAST OF THE
FLORIDA BIG BEND ON THURSDAY AFTERNOON OR EVENING IS EXPECTED.
AFTER THAT...THE SYSTEM IS FORECAST TO ACCELERATE NORTHEASTWARD
ALONG THE COAST OF THE SOUTHEAST UNITED STATES. THERE WILL BE SOME
BAROCLINIC FORCING BY THAT TIME...BUT IT IS UNCLEAR WHEN ANDREA
WILL BECOME POST-TROPICAL. THE NHC FORECAST SHOWS ANDREA REMAINING
A TROPICAL CYCLONE THROUGH 48 HOURS...BUT THE TRANSITION TO A
POST-TROPICAL CYCLONE COULD OCCUR SOONER.

THE CURRENT FORECAST REQUIRES THE ISSUANCE OF A TROPICAL STORM
WARNING ALONG THE WEST COAST OF THE FLORIDA PENINSULA AND A
TROPICAL STORM WATCH ALONG THE SOUTHEAST UNITED STATES COAST. THE
PRIMARY EFFECTS FROM ANDREA ARE EXPECTED TO BE HEAVY RAINFALL
ACROSS MUCH OF THE FLORIDA PENINSULA...STORM SURGE FLOODING ALONG
PORTIONS OF THE WEST COAST OF FLORIDA...AND ISOLATED TORNADOES LATE
TONIGHT AND THURSDAY ACROSS THE FLORIDA PENINSULA.

THE PRONUNCIATION OF THIS NAME IS ANN- DREE UH.

FORECAST POSITIONS AND MAX WINDS

INIT 05/2200Z 25.3N 86.5W 35 KT 40 MPH
12H 06/0600Z 26.5N 86.4W 35 KT 40 MPH
24H 06/1800Z 28.3N 85.0W 40 KT 45 MPH
36H 07/0600Z 31.0N 82.0W 40 KT 45 MPH...INLAND
48H 07/1800Z 34.5N 78.5W 40 KT 45 MPH...INLAND
72H 08/1800Z 43.0N 67.5W 40 KT 45 MPH...POST-TROP/EXTRATROP
96H 09/1800Z 45.0N 48.0W 40 KT 45 MPH...POST-TROP/EXTRATROP
120H 10/1800Z 47.0N 25.0W 40 KT 45 MPH...POST-TROP/EXTRATROP


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