Tropical storm Lee moving slowly northward over south-central Louisiana
Tropical storm Lee moving slowly northward over south-central Louisiana
Tropical Storm LEE Public Advisory
000
WTNT33 KNHC 042056
TCPAT3
BULLETIN
TROPICAL STORM LEE ADVISORY NUMBER 13
NWS NATIONAL HURRICANE CENTER MIAMI FL AL132011
400 PM CDT SUN SEP 04 2011
...LEE MOVING SLOWLY NORTHWARD OVER SOUTH-CENTRAL LOUISIANA...
EXPECTED TO TURN TOWARD THE EAST-NORTHEAST LATER TONIGHT...
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...30.6N 91.8W
ABOUT 30 MI...50 KM NNE OF LAFAYETTE LOUISIANA
ABOUT 110 MI...175 KM WNW OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...
45 MPH...75 KM/H
PRESENT MOVEMENT...N OR 5 DEGREES AT
5 MPH...7 KM/H
MINIMUM CENTRAL PRESSURE...
987 MB...29.15 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY...
THE TROPICAL STORM WARNING HAS BEEN DISCONTINUED FROM WEST OF MORGAN
CITY LOUISIANA WESTWARD TO INTRACOASTAL CITY LOUISIANA.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* DESTIN FLORIDA WESTWARD TO MORGAN CITY LOUISIANA...INCLUDING THE
CITY OF NEW ORLEANS...LAKE PONTCHARTRAIN...AND LAKE MAUREPAS
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.
DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 400 PM CDT...2100 UTC...THE CENTER OF TROPICAL STORM LEE WAS
LOCATED NEAR LATITUDE 30.6 NORTH...LONGITUDE 91.8 WEST. LEE IS
MOVING TOWARD THE NORTH NEAR 5 MPH...7 KM/H. SOME ERRATIC MOTION IS
POSSIBLE THIS AFTERNOON AND EVENING...AND LEE MAY BECOME STATIONARY
BEFORE TURNING TOWARD THE NORTHEAST OR EAST-NORTHEAST BY LATE
TONIGHT. ON THE FORECAST TRACK...THE CENTER WILL MOVE SLOWLY OVER
SOUTHERN AND SOUTHEASTERN LOUISIANA TONIGHT...AND ACROSS SOUTHERN
MISSISSIPPI BY LATE MONDAY.
MAXIMUM SUSTAINED WINDS REMAIN NEAR 45 MPH...75 KM/H...WITH HIGHER
GUSTS. GRADUAL WEAKENING IS FORECAST DURING THE NEXT COUPLE OF
DAYS.
TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 275 MILES...
445 KM...MAINLY EAST AND SOUTHEAST OF THE CENTER OVER WATER.
A NOAA BUOY JUST EAST OF THE MOUTH OF THE MISSISSIPPI RIVER
RECENTLY REPORTED A SUSTAINED WIND OF 36 MPH...57 KM/H AND A
GUST TO 43 MPH...69 KM/H. SEVERAL OFFSHORE OIL RIGS ALSO CONTINUE
TO REPORT SUSTAINED TROPICAL-STORM-FORCE WINDS A FEW HUNDRED FEET
ABOVE THE SURFACE WELL TO THE SOUTHEAST OF THE CENTER OF LEE.
A STORM SURGE VALUE OF MORE THAN 2 FEET RECENTLY OCCURRED JUST SOUTH
OF MORGAN CITY LOUISIANA AT AMERADA PASS.
REPORTS FROM SURFACE OBSERVATIONS INDICATE THE MINIMUM CENTRAL
PRESSURE IS 987 MB...29.15 INCHES.
HAZARDS AFFECTING LAND
----------------------
RAINFALL...TROPICAL STORM LEE IS EXPECTED TO PRODUCE TOTAL RAIN
ACCUMULATIONS OF 10 TO 15 INCHES ACROSS THE CENTRAL GULF COAST
REGION...WITH POSSIBLE ISOLATED MAXIMUM AMOUNTS OF 20 INCHES
THROUGH TUESDAY. HEAVY RAINS WILL CONTINUE TO EXPAND NORTHEASTWARD
INTO THE TENNESSEE VALLEY AND SOUTHERN APPALACHIAN MOUNTAINS
THROUGH TUESDAY WITH RAINFALL AMOUNTS OF 4 TO 8 INCHES EXPECTED...
WITH ISOLATED AMOUNTS OF 10 INCHES POSSIBLE. THESE RAINS ARE
EXPECTED TO CAUSE EXTENSIVE FLOODING AND FLASH FLOODING.
STORM SURGE...ELEVATED WATER LEVELS OF AS MUCH AS 3 TO 5 FEET ABOVE
GROUND LEVEL WILL CONTINUE TO OCCUR OVER PORTIONS OF SOUTHEASTERN
LOUISIANA AND COASTAL PORTIONS OF WESTERN MISSISSIPPI...AND BY AS
MUCH AS 1 TO 3 FEET ABOVE GROUND LEVEL ELSEWHERE WITHIN THE
TROPICAL STORM WARNING AREA. ELEVATED WATER LEVELS WILL BE SLOW TO
RECEDE DUE TO PERSISTENT ONSHORE WINDS.
WIND...TROPICAL STORM CONDITIONS ARE EXPECTED TO CONTINUE OVER
PORTIONS OF THE WARNING AREA TONIGHT AND MONDAY.
TORNADOES...A FEW TORNADOES WILL BE POSSIBLE TONIGHT AND MONDAY OVER
PORTIONS OF SOUTHERN LOUISIANA...SOUTHERN MISSISSIPPI...SOUTHERN
ALABAMA...THE FLORIDA PANHANDLE...AND EXTREME SOUTHWESTERN GEORGIA.
NEXT ADVISORY
-------------
NEXT INTERMEDIATE ADVISORY...700 PM CDT.
NEXT COMPLETE ADVISORY...1000 PM CDT.
$$
FORECASTER STEWART
http://www.nhc.noaa.gov/text/refresh/MIATCPAT3+shtml/042056.shtml
--------------------------------------------------------
Tropical Storm LEE Forecast Discussion
000
WTNT43 KNHC 042105
TCDAT3
TROPICAL STORM LEE DISCUSSION NUMBER 13
NWS NATIONAL HURRICANE CENTER MIAMI FL AL132011
400 PM CDT SUN SEP 04 2011
WSR-88D RADAR DATA AND SATELLITE IMAGERY INDICATE THAT LEE HAS
BECOME A LITTLE BETTER ORGANIZED EVEN THOUGH THE CENTER IS WELL
INLAND NOW OVER SOUTH-CENTRAL LOUISIANA. OTHER THAN THE STRONG
BURST OF DEEP CONVECTION THAT HAS DEVELOPED NEAR THE SURFACE
CENTER...NARROW BANDS OF MODEST CONVECTION CONTINUE TO FORM OVER
SOUTHEASTERN LOUISIANA AND NEAR THE FLORIDA PANHANDLE...WHICH EXTEND
SOUTHWARD OVER THE GULF OF MEXICO FOR A COUPLE HUNDRED MILES. SOME
OF THESE BANDS HAVE CONTAINED DOPPLER VELOCITIES OF 60-68 KT FROM
4500-10000 FT IN 25-35 DBZ ECHOES...WITH MEAN VALUES OF ABOUT 55
KT. ALTHOUGH THESE DOPPLER VELOCITY VALUES WOULD TYPICALLY
TRANSLATE TO SURFACE WINDS OF 45-50 KT...THE WEAK ECHO RETURNS
SUGGEST THAT HIGHER WIND SPEEDS WILL MAINLY OCCUR IN GUSTS. THE
INITIAL INTENSITY IS BEING MAINTAINED AT 40 KT BASED ON SUSTAINED
WIND REPORT OF 40 KT FROM THE BURAS C-MAN STATION...AND THE GUST
DIFFERENTIAL IN THE FORECAST/ADVISORY PRODUCT REMAINS AT 55 KT...
WHICH IS A LITTLE HIGHER THAN THE STANDARD 50-KT GUST VALUE IN
ORDER TO ACCOUNT FOR THE TRANSIENT STRONGER WINDS ALOFT NOTED IN
DOPPLER VELOCITY DATA.
LEE HAS BEEN MOVING TO THE NORTH OVER THE PAST 6 HOURS. HOWEVER...
THE CYCLONE IS EXPECTED TO SLOW DOWN AND TURN TO THE NORTHEAST OR
EAST-NORTHEAST WITHIN THE NEXT 6 TO 12 HOURS. OTHERWISE...THERE IS
NO SIGNIFICANT CHANGE TO THE PREVIOUS TRACK FORECAST REASONING. A
VIGOROUS SHORTWAVE TROUGH OVER THE NORTHERN AND CENTRAL PLAINS IS
EXPECTED TO CONTINUE DIGGING SOUTHEASTWARD AND GRADUALLY LIFT OUT
TO THE NORTHEAST AT A SLIGHTLY FASTER FORWARD SPEED. BY 36 HOURS...
A PIECE OF ENERGY FROM THE SHORTWAVE IS FORECAST BY ALL OF THE
MODELS TO BREAK OFF AND BECOME ABSORBED INTO THE CIRCULATION. THIS
MID-LEVEL BAROCLINIC INTERACTION...COUPLED WITH ABSORPTION BY A
FRONTAL SYSTEM...IS EXPECTED TO TRANSITION LEE INTO A LARGE
LOW-LATITUDE EXTRATROPICAL LOW PRESSURE SYSTEM OVER THE TENNESSEE
VALLEY BY DAYS 2-4. THE OFFICIAL FORECAST TRACK IS SIMILAR TO THE
PREVIOUS ADVISORY AND CLOSELY FOLLOWS THE CONSENSUS TRACK MODELS...
TVCN AND TVCA.
ALL OF THE GLOBAL AND REGIONAL MODELS ARE NOW FORECASTING LEE TO
REMAIN A TROPICAL STORM OR EXTRATROPICAL GALE AREA FOR THE NEXT 36
HOURS OR SO AS THE CYCLONE GETS A SHOT OF BAROCLINIC ENERGY FROM AN
UPSTREAM SHORTWAVE TROUGH. THIS TREND WAS FOLLOWED IN THE OFFICIAL
INTENSITY FORECAST...AND IS A BLEND OF THE INTENSITY CONSENSUS
MODEL ICON...AND INPUT FROM THE NHC TAFB UNIT.
SINCE HEAVY RAINS...STRONG WINDS...AND THE HIGHEST STORM SURGE
VALUES ARE OCCURRING VERY FAR FROM THE CENTER...IT IS IMPORTANT NOT
TO FOCUS ON THE EXACT LOCATION OF THE CENTER OF LEE. THE PRIMARY
THREAT FROM LEE WILL BE EXTREMELY HEAVY RAINFALL OVER MUCH OF THE
SOUTHEASTERN U.S. DURING NEXT SEVERAL DAYS.
FORECAST POSITIONS AND MAX WINDS
INIT 04/2100Z 30.6N 91.8W 40 KT 45 MPH
12H 05/0600Z 30.7N 91.0W 35 KT 40 MPH...INLAND
24H 05/1800Z 31.2N 89.6W 35 KT 40 MPH...INLAND
36H 06/0600Z 32.3N 88.3W 35 KT 40 MPH...POST-TROP/EXTRATROP
48H 06/1800Z 33.3N 87.5W 30 KT 35 MPH...POST-TROP/EXTRATROP
72H 07/1800Z 34.8N 86.8W 20 KT 25 MPH...POST-TROP/EXTRATROP
96H 08/1800Z 36.0N 86.8W 20 KT 25 MPH...POST-TROP/EXTRATROP
120H 09/1800Z...DISSIPATED
$$
FORECASTER STEWART
http://www.nhc.noaa.gov/text/refresh/MIATCDAT3+shtml/042105.shtml?