HURRICANE KATRINA INTERMEDIATE ADVISORY NUMBER 9A
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
7 PM EDT THU AUG 25 2005
...EYE OF KATRINA CURRENTLY MAKING LANDFALL BETWEEN HALLANDALE BEACH
AND NORTH MIAMI BEACH WITH 80 MPH WINDS...PORT EVERGLADES JUST
REPORTED GUSTS TO 92 MPH WINDS...
A HURRICANE WARNING REMAINS IN EFFECT FOR THE SOUTHEAST FLORIDA
COAST FROM JUPITER INLET SOUTHWARD TO FLORIDA CITY...INCLUDING LAKE
OKEECHOBEE. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD HAVE
BEEN COMPLETED.
A TROPICAL STORM WARNING HAS BEEN ISSUED FOR ALL OF THE FLORIDA KEYS
AND FLORIDA BAY FROM KEY WEST NORTHWARD. A TROPICAL STORM WARNING
IS ALSO IN EFFECT ALONG THE GULF COAST OF FLORIDA FROM LONGBOAT KEY
SOUTH AND EASTWARD TO SOUTH OF FLORIDA CITY. A TROPICAL STORM
WARNING REMAINS IN EFFECT ALONG THE FLORIDA EAST COAST FROM NORTH
OF JUPITER INLET TO VERO BEACH.
AT 7 PM EDT...2300Z...THE TROPICAL STORM WARNING FOR GRAND BAHAMA
ISLAND...BIMINI...AND THE BERRY ISLANDS IN THE NORTHWEST BAHAMAS
HAS BEEN DISCONTINUED.
A TROPICAL STORM WATCH IS IN EFFECT FOR PORTIONS THE FLORIDA WEST
COAST FROM NORTH OF LONGBOAT KEY TO ANCLOTE KEY AND FOR THE
EAST-CENTRAL FLORIDA COAST FROM NORTH OF VERO BEACH TO TITUSVILLE
...INCLUDING ALL OF MERRITT ISLAND. A TROPICAL STORM WATCH MEANS
THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH
AREA...GENERALLY WITHIN 36 HOURS.
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 EDT...2300Z...THE EYE OF HURRICANE KATRINA WAS LOCATED
NEAR LATITUDE 25.9 NORTH...LONGITUDE 80.1 WEST. THIS POSITION IS ON
THE COAST BETWEEN HALLANDALE BEACH AND NORTH MIAMI BEACH.
KATRINA IS MOVING TOWARD THE WEST NEAR 6 MPH AND THIS GENERAL MOTION
IS EXPECTED TO CONTINUE DURING THE NEXT 24 HOURS. ON THIS TRACK...
THE CENTER SHOULD MOVE FARTHER INLAND ALONG SOUTH FLORIDA TONIGHT
AND FRIDAY.
LATEST REPORT FROM A NOAA RECONNAISSANCE AIRCRAFT AND THE MIAMI NOAA
DOPPLER RADAR INDICATE MAXIMUM SUSTAINED WINDS ARE 80 MPH... WITH
HIGHER GUSTS. KATRINA IS A CATEGORY ONE HURRICANE ON THE
SAFFIR-SIMPSON SCALE. STRONGER WINDS...ESPECIALLY IN GUSTS...ARE
LIKELY ON HIGH RISING BUILDINGS. A GRADUAL WEAKENING IS EXPECTED AS
KATRINA CONTINUES TO MOVE INLAND ACROSS SOUTH FLORIDA AND THE
EVERGLADES TONIGHT AND FRIDAY.
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 15 MILES FROM THE
CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP
TO 80 MILES.
ESTIMATED MINIMUM CENTRAL PRESSURE IS 985 MB...29.09 INCHES.
STORM SURGE FLOODING OF 2 TO 4 FEET ABOVE NORMAL TIDE LEVELS...
ALONG WITH LARGE AND DANGEROUS BATTERING WAVES...CAN BE EXPECTED
NEAR AND TO THE NORTH OF THE LANDFALL POINT.
DUE TO ITS SLOW FORWARD SPEED...KATRINA IS EXPECTED TO PRODUCE A
SIGNIFICANT HEAVY RAINFALL EVENT OVER SOUTH FLORIDA...AND THE
CENTRAL AND NORTHWEST BAHAMAS. TOTAL RAINFALL ACCUMULATIONS OF 6 TO
10 INCHES WITH ISOLATED MAXIMUM AMOUNTS OF 15 INCHES ARE POSSIBLE.
ISOLATED TORNADOES WILL ALSO BE POSSIBLE OVER SOUTHERN FLORIDA AND
THE FLORIDA KEYS.
REPEATING THE 7 PM EDT POSITION...25.9 N... 80.1 W. MOVEMENT
TOWARD...WEST NEAR 6 MPH. MAXIMUM SUSTAINED WINDS... 80 MPH.
MINIMUM CENTRAL PRESSURE... 985 MB.
HURRICANE KATRINA DISCUSSION NUMBER 9
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
5 PM EDT THU AUG 25 2005
KATRINA IS NOW A HURRICANE BASED ON NOAA RECON SFMR REPORTS OF
SURFACE WINDS TO 64 KT JUST NORTHWEST OF THE CENTER. THESE WINDS
ARE SUPPORTED BY NOAA-MIAMI DOPPLER RADAR VELOCITIES OF 90 KT AT
3000 FT...WHICH EQUATES TO ABOUT 67 KT SURFACE WINDS. THE MOST
RECENT NOAA RECON PRESSURE WHILE COMPOSING THIS DISCUSSION HAS
FALLEN 2 MB IN THE PAST HOUR TO 985 MB.
THE INITIAL MOTION ESTIMATE IS 265/5. 12Z AND 18Z UPPER-AIR DATA
INDICATE THE SUBTROPICAL RIDGE TO THE NORTH OF KATRINA HAS CHANGED
LITTLE WHILE AN INVERTED MID- TO UPPER-LEVEL TROUGH HAS DEVELOPED
NORTHWARD FROM THE CARIBBEAN SEA TO KATRINA. THE TROUGH IS EXPECTED
TO INDUCE A SLIGHT SOUTH OF DUE WEST MOTION FOR THE NEXT 12 HOURS
OR SO. AFTERWARDS...THE RIDGE TO THE NORTH IS EXPECTED TO SLOWLY
WEAKEN AND ERODE ON THE WEST SIDE AS A SHORTWAVE TROUGH OVER THE
CENTRAL U.S. DIGS SOUTHEASTWARD TOWARD THE NORTHERN GULF OF MEXICO.
THIS SLOW EVOLVING PATTERN IS FOECAST TO GRADUALLY INDUCE A SLOW
NORTHWEST AND THEN NORTHWARD MOTION AFTER 48 HOURS. THE NHC MODEL
GUIDANCE IS IN GOOD AGREEMENT ON THE WESTWARD MOTION FOR THE NEXT
36 HOURS...BUT THEN DIVERGES SIGNIFICANTLY AFTER THAT. THE GFS HAS
BEEN THE MOST CONSISTENT/PERSISTENT MODEL IN TAKING KATRINA SLOWLY
NORTHEASTWARD AFTER 72 HOURS ACROSS NORTHWEST FLORIDA...WHEREAS THE
GFDL...GFDN...AND UKMET MODELS HAVE NOW FLIP-FLOPPED WIDELY TO THE
WEST AND BRING KATRINA INLAND BETWEEN MOBILE ALABAMA AND GRAND ISLE
LOUISIANA. THE GFDL AND GFDN MODELS HAVE BEEN GIVEN LESS WEIGHT
GIVEN THEIR PERSISTENT MUCH FASTER WESTWARD MOTION THE PAST 24
HOURS...WHICH HAS NOT MATERIALIZED. THE OFFICIAL FORECAST TRACK IS
SIMILAR TO THE PREVIOUS TRACK AND IS TO THE RIGHT OF THE NHC MODEL
CONSENSUS.
THERE IS STILL A SHORT WINDOW OF OPPORTUNITY FOR KATRINA TO
STRENGTHEN TO AROUND 70 KT BEFORE LANDFALL OCCURS. AFTER LANDFALL
...STEADY WEAKENING IS EXPECTED UNTIL THE HURRICANE EMERGES OFF THE
SOUTHWEST FLORIDA COAST IN ABOUT 30 HOURS. ONCE KATRINA MOVES OVER
THE WARM GULF OF MEXICO WHERE THE VERTICAL SHEAR IS EXPECTED TO BE
LOW...RESTRENGTHENING INTO A HURRICANE SEEMS LIKELY. IT SHOULD BE
EMPHASIZED THAT KATRINA IS NOT FORECAST TO WEAKEN PRIOR TO LANDFALL
...WHICH COULD BE IMPLIED BY THE OFFICIAL INTENSITY FORECAST. IN
CONTRAST...KATRINA IS EXPECTED TO STRENGTHEN TO 90 KT BEFORE
LANDFALL OCCURS IN THE FLORIDA PANHANDLE. THIS IS CONSISTENT WITH
THE SHIPS INTENSITY MODEL AND THE TREND IN THE GFDL MODEL...
ALTHOUGH THE LATTER MODEL MAKES KATRINA A 118-KT CATEGORY 4 STORM.
FORECASTER STEWART
FORECAST POSITIONS AND MAX WINDS
INITIAL 25/2100Z 26.1N 79.9W 65 KT
12HR VT 26/0600Z 26.1N 80.7W 45 KT...INLAND
24HR VT 26/1800Z 26.1N 81.7W 40 KT...INLAND
36HR VT 27/0600Z 26.4N 82.8W 50 KT...OVER WATER
48HR VT 27/1800Z 27.0N 83.7W 60 KT
72HR VT 28/1800Z 28.5N 85.0W 80 KT
96HR VT 29/1800Z 31.5N 84.5W 40 KT...INLAND
120HR VT 30/1800Z 35.0N 81.5W 25 KT...INLAND
<img src="http://www.pronetworks.org/forum/images/smiles/source.jpg"> NOAA/NHC



