Tropical Storm ISAAC

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BULLETIN
TROPICAL STORM ISAAC INTERMEDIATE ADVISORY NUMBER  34B
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092012
200 PM CDT WED AUG 29 2012
 
...ISAAC WEAKENS TO A TROPICAL STORM...LIFE-THREATENING HAZARDS FROM
STORM SURGE AND INLAND FLOODING ARE STILL OCCURRING...
 
 
SUMMARY OF 200 PM CDT...1900 UTC...INFORMATION
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LOCATION...29.8N 90.9W
ABOUT 50 MI...80 KM WSW OF NEW ORLEANS LOUISIANA
ABOUT 55 MI...90 KM SSE OF BATON ROUGE LOUISIANA
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NW OR 310 DEGREES AT 6 MPH...9 KM/H
MINIMUM CENTRAL PRESSURE...974 MB...28.76 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
 
THE HURRICANE WARNING AND THE HURRICANE WATCH HAVE BEEN
DISCONTINUED...AND THE TROPICAL STORM WARNING HAS BEEN ADJUSTED.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
 
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* CAMERON LOUISIANA TO THE ALABAMA-FLORIDA BORDER
 
FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST
OFFICE. 
 
 
DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 200 PM CDT...1900 UTC...THE CENTER OF TROPICAL STORM ISAAC WAS
LOCATED BY NOAA DOPPLER WEATHER RADAR NEAR LATITUDE 29.8 NORTH...
LONGITUDE 90.9 WEST. ISAAC IS MOVING TOWARD THE NORTHWEST NEAR 6
MPH...9 KM/H. THIS GENERAL MOTION IS EXPECTED TO CONTINUE THROUGH
TONIGHT...FOLLOWED BY A TURN TOWARD THE NORTH-NORTHWEST BY THURSDAY
NIGHT OR EARLY FRIDAY. ON THE FORECAST TRACK...THE CENTER OF ISAAC
WILL MOVE FARTHER INLAND OVER LOUISIANA TODAY AND TOMORROW...AND
MOVE OVER SOUTHERN ARKANSAS BY EARLY FRIDAY.
 
MAXIMUM SUSTAINED WINDS ARE NEAR 70 MPH...110 KM/H...WITH HIGHER
GUSTS. GRADUAL WEAKENING IS FORECAST DURING THE NEXT 48 HOURS AS
ISAAC CONTINUES TO MOVE FARTHER INLAND.
 
TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 175 MILES...280 KM
FROM THE CENTER.
 
A GUST TO 70 MPH WAS RECENTLY REPORTED AT GULFPORT MISSISSIPPI.
 
THE ESTIMATED MINIMUM CENTRAL PRESSURE BASED ON NEARBY SURFACE
OBSERVATIONS IS 974 MB...28.76 INCHES.
 
 
HAZARDS AFFECTING LAND
----------------------
EVEN THOUGH ISAAC IS NO LONGER A HURRICANE...LIFE-THREATENING
HAZARDS FROM STORM SURGE AND INLAND FLOODING ARE STILL OCCURRING.

STORM SURGE...THE COMBINATION OF A STORM SURGE AND THE TIDE WILL
CAUSE NORMALLY DRY AREAS NEAR THE COAST TO BE FLOODED BY RISING
WATERS. THE WATER COULD REACH THE FOLLOWING DEPTHS ABOVE GROUND IF
THE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE...
 
* MISSISSIPPI AND SOUTHEASTERN LOUISIANA...6 TO 12 FT
* ALABAMA...3 TO 6 FT
* SOUTH-CENTRAL LOUISIANA...3 TO 6 FT
* FLORIDA PANHANDLE AND APALACHEE BAY...2 TO 4 FT
 
THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OF
ONSHORE WINDS.  SURGE-RELATED FLOODING DEPENDS ON THE RELATIVE
TIMING OF THE SURGE AND THE TIDAL CYCLE...AND CAN VARY GREATLY OVER
SHORT DISTANCES.  FOR INFORMATION SPECIFIC TO YOUR AREA...PLEASE
SEE PRODUCTS ISSUED BY YOUR LOCAL WEATHER SERVICE OFFICE.  NEAR THE
COAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND DANGEROUS WAVES.
 
STORM SURGE VALUES OF ABOUT 8 FEET HAVE RECENTLY BEEN REPORTED AT
WAVELAND MISSISSIPPI.
 
WIND...TROPICAL STORM CONDITIONS WILL CONTINUE ACROSS THE WARNING
AREA TODAY.
 
WINDS AFFECTING THE UPPER FLOORS OF HIGH-RISE BUILDINGS WILL BE
SIGNIFICANTLY STRONGER THAN THOSE NEAR GROUND LEVEL. AT ABOUT THE
30TH STORY...WINDS WOULD LIKELY BE ONE SAFFIR-SIMPSON CATEGORY
STRONGER THAN AT THE SURFACE.
 
RAINFALL...ISAAC IS EXPECTED TO PRODUCE TOTAL RAINFALL AMOUNTS OF
7 TO 14 INCHES...WITH POSSIBLE ISOLATED MAXIMUM AMOUNTS OF 20
INCHES...OVER MUCH OF LOUISIANA...SOUTHERN MISSISSIPPI...AND
SOUTHWEST ALABAMA THROUGH FRIDAY MORNING. THESE RAINS COULD RESULT
IN SIGNIFICANT LOWLAND FLOODING. RAINS ARE EXPECTED TO INCREASE
NORTHWARD INTO ARKANSAS ON THURSDAY...WITH AMOUNTS OF 3 TO 6 INCHES
EXPECTED OVER SOUTHERN ARKANSAS BY FRIDAY MORNING.
 
TORNADOES...ISOLATED TORNADOES ARE POSSIBLE ALONG THE CENTRAL GULF
COAST REGION AND PARTS OF THE LOWER MISSISSIPPI RIVER VALLEY
THROUGH THURSDAY.
 
SURF...DANGEROUS SURF AND RIP CURRENT CONDITIONS WILL CONTINUE TO
AFFECT THE WEST COAST OF FLORIDA AND THE NORTHERN GULF COAST FOR THE
NEXT DAY OR SO.
 
 
NEXT ADVISORY
-------------
NEXT COMPLETE ADVISORY...400 PM CDT.
 
$$
FORECASTER STEWART
 
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