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WTNT34 KNHC 271450
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BULLETIN
TROPICAL STORM ISAAC ADVISORY NUMBER  26
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092012
1000 AM CDT MON AUG 27 2012

...ISAAC MOVING WEST-NORTHWESTWARD OVER THE EASTERN GULF OF
MEXICO...POSES SIGNIFICANT STORM SURGE THREAT TO THE NORTHERN GULF
COAST...


SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...26.1N 85.3W
ABOUT 250 MI...400 KM S OF APALACHICOLA FLORIDA
ABOUT 310 MI...500 KM SE OF THE MOUTH OF THE MISSISSIPPI RIVER
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NW OR 305 DEGREES AT 14 MPH...22 KM/H
MINIMUM CENTRAL PRESSURE...988 MB...29.18 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...

ALL TROPICAL STORM WARNINGS HAVE BEEN DISCONTINUED EAST AND SOUTH OF
AUCILLA RIVER FLORIDA.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

A HURRICANE WARNING IS IN EFFECT FOR...
* EAST OF MORGAN CITY LOUISIANA TO DESTIN FLORIDA...INCLUDING
METROPOLITAN NEW ORLEANS...LAKE PONTCHARTRAIN...AND LAKE MAUREPAS

A HURRICANE WATCH IS IN EFFECT FOR...
* INTRACOASTAL CITY TO MORGAN CITY LOUISIANA

A TROPICAL STORM WARNING IS IN EFFECT FOR...
* EAST OF DESTIN FLORIDA TO THE AUCILLA RIVER
* INTRACOASTAL CITY TO MORGAN CITY LOUISIANA

A TROPICAL STORM WATCH IS IN EFFECT FOR...
* EAST OF SABINE PASS TO WEST OF INTRACOASTAL CITY LOUISIANA

A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA. PREPARATIONS TO PROTECT LIFE AND
PROPERTY SHOULD BE RUSHED TO COMPLETION.

A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE
WITHIN THE WATCH AREA.

A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS.

A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA...INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS...PLEASE MONITOR PRODUCTS ISSUED BY
YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 1000 AM CDT...1500 UTC...THE CENTER OF TROPICAL STORM ISAAC WAS
LOCATED NEAR LATITUDE 26.1 NORTH...LONGITUDE 85.3 WEST. ISAAC IS
MOVING TOWARD THE NORTHWEST NEAR 14 MPH...22 KM/H...AND THIS GENERAL
MOTION IS EXPECTED TO CONTINUE TODAY WITH A GRADUAL DECREASE IN
FORWARD SPEED.  A TURN TOWARD THE NORTHWEST IS EXPECTED BY TUESDAY.
ON THE FORECAST TRACK...THE CENTER OF ISAAC WILL MOVE OVER THE
EASTERN GULF OF MEXICO TODAY AND APPROACH THE NORTHERN GULF COAST
IN THE HURRICANE WARNING AREA ON TUESDAY.

MAXIMUM SUSTAINED WINDS ARE NEAR 65 MPH...100 KM/H...WITH HIGHER
GUSTS.  SOME STRENGTHENING IS FORECAST DURING THE NEXT 48
HOURS...AND ISAAC IS EXPECTED TO BECOME A HURRICANE BEFORE REACHING
THE NORTHERN GULF COAST.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 205 MILES...335 KM
FROM THE CENTER.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 988 MB...29.18 INCHES.


HAZARDS AFFECTING LAND
----------------------
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...

* SOUTHEAST LOUISIANA...MISSISSIPPI...AND ALABAMA...6 TO 12 FT
* SOUTH-CENTRAL LOUISIANA...3 TO 6 FT
* FLORIDA PANHANDLE...3 TO 6 FT
* FLORIDA WEST COAST INCLUDING APALACHEE BAY...1 TO 3 FT

THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OF
ONSHORE FLOW. 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.

WIND...TROPICAL STORM CONDITIONS ARE EXPECTED TO SPREAD NORTHWARD
INTO THE FLORIDA BIG BEND AREA AND THE FLORIDA PANHANDLE IN THE
TROPICAL STORM WARNING AREA TONIGHT.

TROPICAL STORM CONDITIONS ARE EXPECTED TO REACH THE NORTHERN GULF
COAST IN THE HURRICANE WARNING AREA LATER TONIGHT...WITH HURRICANE
CONDITIONS EXPECTED ON TUESDAY.

RAINFALL...ISAAC IS EXPECTED TO PRODUCE ADDITIONAL RAIN
ACCUMULATIONS OF 1 TO 3 INCHES OVER THE FLORIDA PENINSULA...WHERE
ISOLATED MAXIMUM STORM TOTAL AMOUNTS OF 15 INCHES ARE POSSIBLE.
TOTAL RAINFALL AMOUNTS OF 6 TO 12 INCHES...WITH MAXIMUM AMOUNTS OF
18 INCHES...ARE POSSIBLE IN SOUTHEASTERN LOUISIANA...SOUTHERN
MISSISSIPPI...SOUTHERN ALABAMA AND THE WESTERN FLORIDA PANHANDLE.

TORNADOES...ISOLATED TORNADOES ARE POSSIBLE IN CENTRAL AND
NORTHERN FLORIDA TODAY...AND ALONG THE NORTHERN GULF COAST TONIGHT
AND TUESDAY.

SURF...DANGEROUS SURF AND RIP CURRENT CONDITIONS WILL CONTINUE TO
AFFECT THE FLORIDA COASTLINE AND THE FLORIDA KEYS DURING THE NEXT
DAY OR SO...AND BEGIN TO AFFECT PORTIONS OF THE NORTHERN GULF COAST
LATER TODAY.


NEXT ADVISORY
-------------
NEXT INTERMEDIATE ADVISORY...100 PM CDT.
NEXT COMPLETE ADVISORY...400 PM CDT.

$$
FORECASTER STEWART



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