[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 181209
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT MON MAR 18 2013

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1115 UTC.

...ITCZ/MONSOON TROUGH...
THE MONSOON TROUGH PASSES THROUGH COASTAL GUINEA NEAR 11N15W TO
8N17W AND 5N19W. THE ITCZ CONTINUES FROM 5N19W TO 2N30W...
CROSSING THE EQUATOR ALONG 39W...TO 2S42W. CONVECTIVE
PRECIPITATION...SCATTERED MODERATE TO STRONG TO THE SOUTH OF 4N
BETWEEN 14W AND 40W.

...DISCUSSION...

GULF OF MEXICO...
A SURFACE RIDGE PASSES THROUGH THE ATLANTIC OCEAN NEAR 28N78W
ACROSS THE NORTHERN PART OF FLORIDA...BEYOND THE FLORIDA
PANHANDLE.

MIDDLE LEVEL TO UPPER LEVEL SOUTHWESTERLY WIND FLOW SPANS THE AREA.
A MIDDLE LEVEL TO UPPER LEVEL TROUGH STILL IS INLAND...PASSING
THROUGH NEBRASKA INTO WEST TEXAS.

A MIDDLE LEVEL SHORTWAVE TROUGH WAS IN THE NORTHWESTERN CORNER
OF THE GULF OF MEXICO AT 17/2115 UTC. IT MOVED NORTHEASTWARD
WITH TIME AND IT HAS DISSIPATED SINCE THEN. ISOLATED MODERATE
CONVECTIVE PRECIPITATION DEVELOPED ON THE EASTERN SIDE OF THE
TROUGH...TO THE NORTH OF 25N TO THE EAST OF 88W. RAINSHOWERS ARE
POSSIBLE ELSEWHERE TO THE EAST OF 90W...INCLUDING IN THE YUCATAN
CHANNEL...AND POSSIBLY TO THE SOUTH OF 23N TO THE WEST OF 90W.

THE OFFSHORE OIL PLATFORM SITES THAT ARE TO THE NORTH OF 27N
TO THE WEST OF 88W...THE SKIES ARE CLEAR/FAIR FOR THE PLATFORMS
THAT ARE TO THE EAST OF 90W. THE VISIBILITIES RANGE FROM 1 TO
2 MILES WITH HAZE AND FOG FOR THE STATIONS THAT ARE OFF THE TEXAS
GULF COAST. THE VISIBILITIES RANGE FROM 5 MILES TO 6 MILES FROM
ICAO STATION KECH AND SOUTHWARD ROUGHLY BETWEEN 92W AND 94W. THE
ICAO STATIONS KCRH...KVNP...AND KVBS ARE REPORTING LOW CLOUD
CEILINGS AND VISIBILITIES THAT ARE LESS THAN 2 MILES WITH FOG.
THE ICAO STATIONS THAT ARE ALONG AND TO THE EAST OF 90W ARE
REPORTING COMPARATIVELY BETTER VISIBILITIES SUCH AS 9 MILES AND
10 MILES. ONLY ICAO STATION KMYT IS REPORTING A VISIBILITY OF
3 MILES WITH FOG. THE REST OF THE PLATFORM SITES ARE REPORTING
VISIBILITIES OF 4 MILES OR LESS WITH FOG. ICAO STATION KSPR
REPORTS A VISIBILITY OF 1.5 MILES WITH FOG.

LOW CLOUD CEILINGS COVER THE TEXAS GULF COASTAL PLAINS...TO THE
NORTH OF THE DEEP SOUTH OF TEXAS. BEAUMONT/PORT ARTHUR IS
REPORTING A VISIBILITY OF 2 MILES WITH FOG. LOW CLOUD CEILINGS
AND SOME FOG COVER THE LOUISIANA COASTAL PLAINS. LOW CLOUD
CEILINGS...SOME RAIN AND SOME FOG ARE OBSERVED IN THE FLORIDA
PANHANDLE. LOW CLOUD CEILINGS ELSEWHERE TO THE WEST OF 83W. FAIR
SKIES COVER THE REST OF THE FLORIDA GULF COAST TO THE SOUTH OF
SARASOTA.

CARIBBEAN SEA...
BROAD MIDDLE LEVEL TO UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS
THE AREA. A RIDGE EXTENDS FROM THE COLOMBIA COAST THAT IS NEAR
10N75W TO 15N80W... BEYOND THE YUCATAN CHANNEL/WESTERN CUBA.

RAINSHOWERS ARE POSSIBLE TO THE NORTH OF 15N TO THE EAST OF 80W.

PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...AND THE
OFFSHORE FORECAST...MIAOFFNT3...FOR MORE DETAILS ABOUT 25
TO 30 KNOT WINDS AND 9 TO 12 FOOT SEA HEIGHTS FROM 13N TO 15N
BETWEEN 73W AND 77W. EXPECT 20 TO 25 KNOT WINDS AND 8 TO 10 FOOT
SEA HEIGHTS ELSEWHERE FROM 10N TO 15N BETWEEN 70W AND 78W.
EXPECT 20 TO 25 KNOT WINDS AND 8 FOOT SEA HEIGHTS FROM 16N
TO 18N BETWEEN 70W AND 76W. EXPECT 20 KNOT WINDS OR LESS
AND 9 FOOT SEA HEIGHTS FOR THE REST OF THE AREA FROM 10N TO 16N
BETWEEN 68W AND 80W. EXPECT 20 TO 25 KNOT WINDS AND SEA HEIGHTS
LOWER THAN 8 FEET TO THE SOUTH OF 18N BETWEEN 85W AND 87W...
INCLUDING IN THE GULF OF HONDURAS.

ATLANTIC OCEAN...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N26W TO
26N33W TO 22N42W. A DISSIPATING COLD FRONT IS ALONG 31N27W TO
24N34W AND 22N42W. A SHEAR AXIS CONTINUES FROM 22N42W TO 21N50W
AND 20N62W. BROKEN TO OVERCAST MULTILAYERED CLOUDS AND POSSIBLE
RAINSHOWERS ARE WITHIN 90 NM ON EITHER SIDE OF THE LINE THAT
STARTS NEAR 31N24W 22N32W 20N51W AND 18N64W.

RAINSHOWERS ARE POSSIBLE TO THE SOUTH OF 13N41W 18N48W 19N51W
17N60W.

A SURFACE RIDGE PASSES THROUGH 32N39W TO 27N48W...TO A 1024 MB
HIGH PRESSURE CENTER THAT IS NEAR 28N60W...TO 28N78W...ACROSS
THE NORTHERN PART OF FLORIDA...BEYOND THE FLORIDA PANHANDLE.

A SURFACE RIDGE PASSES THROUGH THE CANARY ISLANDS TO 22N20W
17N32W AND 18N50W.

PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...FOR MORE
DETAILS A SHEAR AXIS FROM 21N44W TO 20N55W AND 18N63W.
EXPECT 20 KNOT WINDS OR LESS WITHIN 180 NM TO THE NORTH
OF THE SHEAR AXIS AND 9 FOOT SEA HEIGHTS. ELSEWHERE TO THE
NORTH AND NORTHEAST OF A LINE FROM 27N35W TO 22N43W TO 22N55W
TO 28N53W TO 31N65W WINDS 20 KT OR LESS. SEAS TO 9 FT. EXPECT
20 KNOT WINDS OR LESS AND 8 FOOT SEA HEIGHTS TO THE SOUTH
OF 10N BETWEEN 45W AND 58W.

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

$$
MT


This weather bulletin was brought to you by:
www.nashvilleweather.net