[Tropical] Tropical Weather Discussion

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AXNT20 KNHC 300620 CCA
TWDAT

TROPICAL WEATHER DISCUSSION...COR
NWS NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT THU AUG 30 2012

CORRECTION FOR INFORMATION ABOUT T.S. ISAAC

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS
OF SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST
FROM THE EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED
ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0515 UTC.

...SPECIAL FEATURES...

THE CENTER OF TROPICAL STORM ISAAC AT 30/0600 UTC IS NEAR
30.5N 91.3W. ISAAC HAS BEEN INLAND FOR AT LEAST THE LAST
24 HOURS OR SO. ISAAC MADE LANDFALL AROUND 28/2345 UTC IN
SOUTHEASTERN LOUISIANA. THIS POSITION IS ABOUT 9 NM TO THE
WEST-SOUTHWEST OF BATON ROUGE IN LOUISIANA...AND ABOUT
70 NM TO THE WEST-NORTHWEST OF NEW ORLEANS IN LOUISIANA.
ISAAC IS MOVING NORTHWESTWARD 4 KNOTS. THE MINIMUM CENTRAL
PRESSURE IS 981 MB. THE MAXIMUM SUSTAINED WIND SPEEDS ARE
45 KNOTS WITH GUSTS TO 55 KNOTS. PLEASE READ THE NHC
FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMAT4/
WTNT24 KNHC AND THE PUBLIC ADVISORY...MIATCPAT4/ WTNT34 KNHC
FOR MORE DETAILS. CONVECTIVE PRECIPITATION...NUMEROUS STRONG
FROM 29N TO 30N BETWEEN 90W AND 91W...SCATTERED MODERATE TO
ISOLATED STRONG ELSEWHERE FROM 27N IN THE GULF OF MEXICO
TO NORTHERN MISSISSIPPI BETWEEN THE FLORIDA PANHANDLE AND
ALABAMA NEAR 86W AND 93W IN WESTERN LOUISIANA. ALL RESIDENTS
IN LOUISIANA AND MISSISSIPPI AND SURROUNDING STATES SHOULD
CONTINUE TO MONITOR ALL BULLETINS THAT ARE ISSUED BY THE
NATIONAL HURRICANE CENTER AND THE LOCAL NATIONAL WEATHER
SERVICE OFFICES FOR UPDATES ABOUT TROPICAL STORM ISAAC.

THE CENTER OF TROPICAL STORM KIRK AT 30/0300 UTC IS NEAR
24.3N 45.3W. KIRK IS MOVING WEST-NORTHWESTWARD 8 KNOTS.
THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1002 MB. THE
MAXIMUM SUSTAINED WIND SPEEDS ARE 50 KT WITH GUSTS TO 60 KT.
PLEASE READ THE NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS
MIATCMAT1/WTNT21 KNHC AND THE PUBLIC ADVISORY...MIATCPAT1/
WTNT31 KNHC FOR MORE DETAILS. SCATTERED MODERATE TO STRONG
CONVECTIVE PRECIPITATION IS FROM 26N TO 27N BETWEEN 47W AND 49W.
COMPARATIVELY DRIER AIR IN SUBSIDENCE IN WATER VAPOR IMAGERY
COVERS THE ATLANTIC OCEAN TO THE SOUTH OF 20N TO THE WEST OF
50W...AND TO THE NORTH OF 20N TO THE WEST OF 50W.

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 20N35W 16N38W TO
A 1008 MB LOW PRESSURE CENTER THAT IS ALONG THE WAVE NEAR
13.5N38W. CONVECTIVE PRECIPITATION...NUMEROUS STRONG FROM
12.5N TO 15.5N BETWEEN 40W AND 43W...SCATTERED STRONG FROM
10N TO 12N BETWEEN 42W AND 48W. THIS SYSTEM HAS A HIGH CHANCE
OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.

...TROPICAL WAVES...

NO OTHER TROPICAL WAVES ARE INCLUDED IN THE 30/0000 UTC
SURFACE MAP ANALYSIS. PLEASE REFER TO THE SPECIAL FEATURES
SECTION FOR DETAILS ABOUT THE 20N35W 13.5N38W TROPICAL WAVE
AND THE ACCOMPANYING 1008 MB LOW PRESSURE CENTER.

...THE ITCZ/THE MONSOON TROUGH...

THE MONSOON TROUGH IS INDISTINCT TO THE EAST OF THE 20N35W
13.5N38W TROPICAL WAVE. THE MONSOON TROUGH HAS BEEN DISRUPTED
BY THE LARGE-SCALE WIND FLOW THAT IS MOVING AROUND THE WAVE
AND LOW CENTER FEATURE. THE ITCZ AXIS IS ALONG 12N52W 14N56W
TO 14N61W NEAR SAINT LUCIA. ISOLATED MODERATE RAINSHOWERS ARE
ELSEWHERE FROM 10N TO 16N BETWEEN 50W AND 60W.

...DISCUSSION...

THE GULF OF MEXICO...

THE UPPER LEVEL ANTICYCLONIC OUTFLOW FROM ISAAC COVERS
THE SOUTHEASTERN U.S.A. AND MUCH OF THE GULF OF MEXICO...
EXCEPT FOR THE SOUTHWESTERN CORNER OF THE AREA.
COMPARATIVELY DRIER AIR IN SUBSIDENCE SHOWS UP IN WATER
VAPOR IMAGERY IN THE SOUTHWESTERN CORNER OF THE
GULF OF MEXICO.

THE SURFACE PRESSURE PATTERN IN THE EASTERN GULF OF MEXICO
IS MADE UP OF THE CLOSED ISOBARS THAT SURROUND ISAAC.
THESE ISOBARS COVER THE AREA THAT IS TO THE NORTH OF 26N.

PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...AND THE
OFFSHORE FORECAST...MIAOFFNT4...FOR MORE DETAILS ABOUT
HURRICANE ISAAC.

FROM THE FLORIDA KEYS AND THE STRAITS OF FLORIDA...
INTO THE CARIBBEAN SEA...

A MIDDLE LEVEL TO UPPER LEVEL TROUGH IS ALONG 23N82W IN WESTERN
CUBA...TO 16N8W...INTO NORTHWESTERN COLOMBIA. NUMEROUS STRONG
CONVECTIVE PRECIPITATION IS FROM 7N TO 9N BETWEEN 74W AND 78W.
ISOLATED MODERATE CONVECTIVE PRECIPITATION IS ELSEWHERE IN THE
CARIBBEAN SEA TO THE WEST OF 79W.

THE REST OF THE CARIBBEAN SEA...

THE MONSOON TROUGH IS ALONG 8N75W IN COLOMBIA...THROUGH 9N80W
IN PANAMA...BEYOND NORTHWESTERN COSTA RICA. NUMEROUS STRONG
CONVECTIVE PRECIPITATION IS FROM 7N TO 9N BETWEEN 74W AND 78W.
THE BASE OF THE MIDDLE LEVEL TO UPPER LEVEL TROUGH THAT PASSES
OVER NORTHWESTERN CUBA IS IN THE GULF OF URABA.

BROAD UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS THE CARIBBEAN
SEA THAT IS TO THE EAST OF THE CUBA-TO-GULF OF URABA MIDDLE
LEVEL TO UPPER LEVEL TROUGH. UPPER LEVEL NORTHEASTERLY WIND
FLOW IS ON THE WESTERN SIDE OF THE TROUGH.

PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...AND THE
OFFSHORE FORECAST...MIAOFFNT3...FOR MORE DETAILS ABOUT THE
20 TO 25 KNOT WINDS AND 8 TO 10 FOOT SEA HEIGHTS FROM
12N TO 18N BETWEEN 69W AND 81W.

THE REST OF THE ATLANTIC OCEAN...

BROAD MIDDLE LEVEL TO UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS
THE ATLANTIC OCEAN TO THE SOUTH OF 20N BETWEEN 20W AND 70W.
MIDDLE LEVEL NORTHERLY WIND FLOW COVERS THE AREA TO THE NORTH
OF 20N BETWEEN T.S. KIRK AND 60W. COMPARATIVELY DRIER AIR IN
SUBSIDENCE COVERS THE AREA...EXCEPT FOR THE CONVECTIVE
PRECIPITATION THAT ACCOMPANIES T.S. KIRK.

BROAD SURFACE ANTICYCLONIC WIND FLOW MOVES AROUND
A 1019 MB HIGH PRESSURE CENTER THAT IS NEAR 27N62W.

PLEASE READ THE HIGH SEAS FORECASTS...MIAHSFAT2...FOR DETAILS
ABOUT TROPICAL STORM KIRK. A SECOND FEATURE OF INTEREST IS
A 1009 MB LOW PRESSURE CENTER THAT STARTS NEAR 13N39W...AT
24 HOURS 1006 MB POSSIBLE TROPICAL CYCLONE NEAR 15N44W...
AND AT 48 HOURS 1005 MB POSSIBLE TROPICAL CYCLONE NEAR 17N50W.

FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

$$
MT





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