Hurricane Katrina

Public Advisory 18A

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000
WTNT32 KNHC 272350
TCPAT2
BULLETIN
HURRICANE KATRINA INTERMEDIATE ADVISORY NUMBER 18A
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
7 PM CDT SAT AUG 27 2005

...DANGEROUS HURRICANE KATRINA BEGINS TO MOVE TOWARD THE
WEST-NORTHWEST...

A HURRICANE WATCH IS IN EFFECT ALONG THE NORTHERN GULF COAST FROM
INTRACOASTAL CITY TO THE ALABAMA-FLORIDA BORDER.

A HURRICANE WARNING WILL LIKELY BE REQUIRED FOR PORTIONS OF THE
NORTHERN GULF COAST LATER TONIGHT. INTERESTS IN THIS AREA SHOULD
MONITOR THE PROGRESS OF KATRINA.

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

AT 7 PM CDT...0000Z...THE CENTER OF HURRICANE KATRINA WAS LOCATED
NEAR LATITUDE 24.8 NORTH...LONGITUDE 85.9 WEST OR ABOUT 360 MILES
SOUTHEAST OF THE MOUTH OF THE MISSISSIPPI RIVER.

KATRINA HAS BEGUN TO MOVE TOWARD THE WEST-NORTHWEST NEAR 7 MPH.
THIS GENERAL MOTION SHOULD CONTINUE TONIGHT AND SUNDAY.

MAXIMUM SUSTAINED WINDS ARE NEAR 115 MPH...WITH HIGHER GUSTS.
KATRINA IS A CATEGORY THREE HURRICANE ON THE SAFFIR-SIMPSON
SCALE. STRENGTHENING IS FORECAST DURING THE NEXT 24 HOURS...AND
KATRINA COULD BECOME A CATEGORY FOUR HURRICANE LATER TONIGHT OR
SUNDAY.

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 45 MILES FROM THE
CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 160
MILES. NOAA BUOY 42003 LOCATED NORTHWEST OF THE CENTER RECENTLY
REPORTED SUSTAINED WINDS OF 54 MPH WITH A GUST TO 64 MPH AND
25-FOOT WAVES.

THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY AN AIR FORCE
RECONNAISSANCE PLANE WAS 944 MB...27.88 INCHES.

DATA FROM BUOYS INDICATE THAT 12-FOOT WAVES ARE ALREADY APPROACHING
PORTIONS OF THE NORTHERN GULF COAST. STORM SURGE FLOODING ALONG THE
SOUTHWESTERN COAST OF FLORIDA SHOULD SUBSIDE TONIGHT.

KATRINA IS EXPECTED TO PRODUCE ADDITIONAL RAINFALL AMOUNTS OF 3 TO
5 INCHES OVER EXTREME WESTERN CUBA...AND 1 TO 3 INCHES OF RAINFALL
IS EXPECTED OVER THE YUCATAN PENINSULA. HEAVY RAINS FROM KATRINA
SHOULD BEGIN TO AFFECT THE CENTRAL GULF COAST SUNDAY EVENING.
RAINFALL TOTALS OF 5 TO 10 INCHES...WITH ISOLATED MAXIMUM AMOUNTS
OF 15 INCHES...ARE POSSIBLE ACROSS THE CENTRAL GULF COAST.

REPEATING THE 7 PM CDT POSITION...24.8 N... 85.9 W. MOVEMENT
TOWARD...WEST-NORTHWEST NEAR 7 MPH. MAXIMUM SUSTAINED WINDS...115
MPH. MINIMUM CENTRAL PRESSURE... 944 MB.

THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
10 PM CDT.

FORECASTER AVILA


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