Humberto Becomes A Tropical Storm After Making Landfall

TROPICAL STORM HUMBERTO ADVISORY NUMBER 6
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL092007
1000 AM CDT THU SEP 13 2007
...HUMBERTO WEAKENS TO A TROPICAL STORM OVER SOUTHWESTERN
LOUISIANA...
AT 1000 AM CDT...1500 UTC...ALL COASTAL HURRICANE AND TROPICAL STORM
WARNINGS ARE DISCONTINUED. HOWEVER...DAMAGING WINDS ARE STILL
OCCURRING INLAND NEAR THE CENTER OF HUMBERTO. FOR STORM
INFORMATION SPECIFIC TO YOUR AREA...INCLUDING INLAND WATCHES AND
WARNINGS...PLEASE MONITOR PRODUCTS ISSUED BY YOUR LOCAL WEATHER
OFFICE.
AT 1000 AM CDT...1500Z...THE CENTER OF TROPICAL STORM HUMBERTO WAS
LOCATED NEAR LATITUDE 30.6 NORTH...LONGITUDE 93.2 WEST OR ABOUT 75
MILES...125 KM...WEST-NORTHWEST OF LAFAYETTE LOUISIANA.
HUMBERTO IS MOVING TOWARD THE NORTHEAST NEAR 12 MPH...19 KM/HR...AND
THIS MOTION IS EXPECTED TO CONTINUE FOR THE NEXT 24 HOURS.
MAXIMUM SUSTAINED WINDS ARE NEAR 65 MPH...100 KM/HR...WITH HIGHER
GUSTS. ADDITIONAL WEAKENING IS EXPECTED TODAY...AND HUMBERTO SHOULD
BECOME A TROPICAL DEPRESSION BY EARLY FRIDAY.
TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 35 MILES...55 KM
FROM THE CENTER.
ESTIMATED MINIMUM CENTRAL PRESSURE IS 990 MB...29.23 INCHES.
RAINFALL AMOUNTS OF 4 TO 8 INCHES ARE EXPECTED ACROSS MUCH OF
LOUISIANA AND MISSISSIPPI...AS WELL AS EXTREME SOUTHEASTERN
ARKANSAS...WITH ISOLATED MAXIMUM AMOUNTS OF 12 INCHES POSSIBLE.
SOME COASTAL FLOODING IS POSSIBLE FROM CAMERON LOUISIANA TO
VERMILLION BAY TODAY.
ISOLATED TORNADOES ARE POSSIBLE IN SOUTHEASTERN LOUISIANA AND
SOUTHERN MISSISSIPPI THROUGH TONIGHT.
REPEATING THE 1000 AM CDT POSITION...30.6 N...93.2 W. MOVEMENT
TOWARD...NORTHEAST NEAR 12 MPH. MAXIMUM SUSTAINED WINDS...65 MPH.
MINIMUM CENTRAL PRESSURE...990 MB.
THE NEXT ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE CENTER AT
400 PM CDT.
TROPICAL STORM HUMBERTO DISCUSSION NUMBER 6
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL092007
1100 AM EDT THU SEP 13 2007
DOPPLER RADAR VELOCITIES SUGGEST THAT HUMBERTO HAS WEAKENED TO A
TROPICAL STORM...AND ADDITIONAL WEAKENING IS EXPECTED AS THE
CYCLONE PUSHES FARTHER INLAND. SURFACE OBSERVATIONS INDICATE THAT
TROPICAL STORM CONDITIONS ARE NO LONGER OCCURRING ALONG THE
COAST...AND SO THE COASTAL WARNINGS ARE BEING DISCONTINUED.
HOWEVER...DAMAGING WINDS...WITH A FEW GUSTS TO HURRICANE
FORCE...ARE STILL OCCURRING NEAR THE CENTER.
THE INITIAL MOTION ESTIMATE IS 040/10. THIS IS TO THE RIGHT OF THE
DYNAMICAL TRACK GUIDANCE MODELS...WHICH COLLECTIVELY HAVE HAD A
LEFT BIAS OVER THE LAST DAY OR SO. THE OFFICIAL FORECAST IS
CONSISTENT WITH THE INITIAL MOTION...AND THE CIRCULATION IS
EXPECTED TO DISSIPATE WITHIN AN APPROACHING FRONTAL ZONE WITHIN 48
HOURS.
BASED ON OPERATIONAL ESTIMATES...HUMBERTO STRENGTHENED FROM A 30 KT
DEPRESSION AT 15Z YESTERDAY TO A 75 KT HURRICANE AT 09Z THIS
MORNING...AN INCREASE OF 45 KT IN 18 HOURS. TO PUT THIS
DEVELOPMENT IN PERSPECTIVE...NO TROPICAL CYCLONE IN THE HISTORICAL
RECORD HAS EVER REACHED THIS INTENSITY AT A FASTER RATE NEAR
LANDFALL. IT WOULD BE NICE TO KNOW...SOMEDAY...WHY THIS HAPPENED.