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WTNT34 KNHC 250852
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BULLETIN
HURRICANE IRENE ADVISORY NUMBER  20
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092011
500 AM EDT THU AUG 25 2011

...DANGEROUS HURRICANE IRENE MOVING OVER THE NORTHWESTERN
BAHAMAS...HURRICANE AND TROPICAL STORM WATCHES ISSUED FOR A PORTION
OF THE U.S. EAST COAST...


SUMMARY OF 500 AM EDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...24.6N 76.2W
ABOUT 80 MI...130 KM ESE OF NASSAU
ABOUT 735 MI...1180 KM S OF CAPE HATTERAS NORTH CAROLINA
MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H
PRESENT MOVEMENT...NW OR 315 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...950 MB...28.05 INCHES


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

A HURRICANE WATCH HAS BEEN ISSUED FOR THE NORTH CAROLINA COAST FROM
NORTH OF SURF CITY TO THE NORTH CAROLINA-VIRGINIA BORDER INCLUDING
THE PAMLICO...ALBEMARLE...AND CURRITUCK SOUNDS.

A TROPICAL STORM WATCH HAS BEEN ISSUED FROM NORTH OF EDISTO BEACH
SOUTH CAROLINA TO SURF CITY NORTH CAROLINA.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

A HURRICANE WARNING IS IN EFFECT FOR...
* THE SOUTHEASTERN...CENTRAL...AND NORTHWESTERN BAHAMAS

A HURRICANE WATCH IS IN EFFECT FOR...
* NORTH OF SURF CITY NORTH CAROLINA TO THE NORTH CAROLINA-VIRGINIA
BORDER INCLUDING THE PAMLICO...ALBEMARLE...AND CURRITUCK SOUNDS

A TROPICAL STORM WATCH IS IN EFFECT FOR...
* NORTH OF EDISTO BEACH SOUTH CAROLINA TO SURF CITY NORTH CAROLINA

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


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 500 AM EDT...0900 UTC...THE CENTER OF HURRICANE IRENE WAS LOCATED
NEAR LATITUDE 24.6 NORTH...LONGITUDE 76.2 WEST. IRENE IS MOVING
TOWARD THE NORTHWEST NEAR 12 MPH...19 KM/H.  A TURN TOWARD THE
NORTH-NORTHWEST IS EXPECTED TODAY...FOLLOWED BY A TURN TOWARD THE
NORTH BY EARLY FRIDAY.  ON THE FORECAST TRACK...THE CORE OF THE
HURRICANE WILL CONTINUE TO MOVE OVER THE NORTHWESTERN BAHAMAS
TODAY...AND PASS WELL OFFSHORE OF THE EAST COAST OF CENTRAL AND
NORTH FLORIDA TONIGHT AND EARLY FRIDAY.

MAXIMUM SUSTAINED WINDS ARE NEAR 115 MPH...185 KM/H...WITH HIGHER
GUSTS.  IRENE IS A CATEGORY THREE HURRICANE ON THE SAFFIR-SIMPSON
HURRICANE WIND SCALE.  SOME STRENGTHENING IS EXPECTED TODAY AND
TONIGHT.

IRENE IS A LARGE TROPICAL CYCLONE.  HURRICANE FORCE WINDS EXTEND
OUTWARD UP TO 70 MILES...110 KM...FROM THE CENTER...AND TROPICAL-
STORM-FORCE WINDS EXTEND OUTWARD UP TO 255 MILES...410 KM.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 950 MB...28.05 INCHES.


HAZARDS AFFECTING LAND
----------------------
WIND...HURRICANE FORCE WINDS ARE CURRENTLY SPREADING OVER THE
NORTHWESTERN BAHAMAS.  HURRICANE OR TROPICAL STORM FORCE WINDS ARE
STILL OCCURRING OVER PORTIONS OF THE CENTRAL BAHAMAS...BUT SHOULD
BEGIN TO DIMINISH LATER TODAY.

STORM SURGE...IN AREAS OF ONSHORE WINDS NEAR THE CENTER OF IRENE...
AN EXTREMELY DANGEROUS STORM SURGE WILL RAISE WATER LEVELS BY AS
MUCH AS 7 TO 11 FEET ABOVE NORMAL TIDE LEVELS OVER THE BAHAMAS.
NEAR THE COAST...THE SURGE WILL BE ACCOMPANIED BY LARGE AND
DANGEROUS WAVES.

RAINFALL...IRENE IS EXPECTED TO PRODUCE RAINFALL ACCUMULATIONS OF 6
TO 12 INCHES OVER THE BAHAMAS DURING THE NEXT 36 HOURS. RAINS WILL
BE DIMINISHING ACROSS THE TURKS AND CAICOS ISLANDS WITH ADDITIONAL
RAINFALL AMOUNTS OF 1 TO 3 INCHES POSSIBLE...BRINGING THE MAXIMUM
STORM TOTAL TO 6 TO 12 INCHES.

SURF...SWELLS GENERATED BY IRENE WILL BEGIN AFFECTING PORTIONS OF
THE COAST OF THE SOUTHEASTERN UNITED STATES TODAY.  THESE SWELLS ARE
EXPECTED TO CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS.
PLEASE CONSULT PRODUCTS FROM YOUR LOCAL NATIONAL WEATHER SERVICE
FORECAST OFFICE.


NEXT ADVISORY
-------------
NEXT INTERMEDIATE ADVISORY...800 AM EDT.
NEXT COMPLETE ADVISORY...1100 AM EDT.

$$
FORECASTER PASCH/KIMBERLAIN



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