[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 231150
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT TUE APR 23 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
1015 UTC.

...ITCZ/MONSOON TROUGH...

THE MONSOON TROUGH PASSES THROUGH COASTAL SIERRA LEONE NEAR
8N13W...TO 5N15W. THE ITCZ CONTINUES FROM 5N15W TO 4N16W 2N30W
AND 2N39W. CONVECTIVE PRECIPITATION...SCATTERED TO NUMEROUS
STRONG TO THE EAST OF 10W TO THE SOUTH OF 6N BETWEEN 22W AND
30W...AND TO THE SOUTH OF 6N BETWEEN 50W AND 52W. ISOLATED
MODERATE TO LOCALLY STRONG TO THE SOUTH OF 7N BETWEEN 30W AND
40W.

...DISCUSSION...

GULF OF MEXICO...
MIDDLE LEVEL TO UPPER LEVEL TROUGH NORTHWESTERLY WIND FLOW
COVERS THE AREA. AN EASTERN PACIFIC OCEAN MIDDLE LEVEL TO UPPER
LEVEL RIDGE IS ALONG 14N94W 18N105W 25N110W. THE NORTHWESTERLY
WIND FLOW MOVES FROM MEXICO INTO AND ACROSS THE GULF OF MEXICO.

THE NORTHWESTERLY WIND FLOW IS MOVING TOWARD THE BASE OF THE
32N76W 27N76W 25N72W MIDDLE LEVEL TO UPPER LEVEL TROUGH.

COMPARATIVELY DRIER AIR IN SUBSIDENCE IS TO THE NORTH OF 26N97W
22N87W IN THE YUCATAN CHANNEL. BROKEN TO OVERCAST LOW CLOUD
CEILINGS ARE IN THE GULF OF MEXICO TO THE NORTH OF 26N TO THE
EAST OF 86W.

LOW CLOUD CEILINGS COVER THE TEXAS COASTAL PLAINS FROM THE DEEP
SOUTH TO THE BEAUMONT/PORT ARTHUR AREA OF THE UPPER TEXAS GULF
COAST. LOW CLOUD CEILINGS COVER MUCH OF THE COASTAL PLAINS AND
SOUTHERN SECTIONS OF LOUISIANA. LOW CLOUDS...FOG...AND A
VISIBILITY OF 0.5 OF A MILE ARE IN PASCAGOULA MISSISSIPPI. LOW
CLOUD CEILINGS COVER THE FLORIDA GULF COASTAL PLAINS.

FOR THE OFFSHORE OIL PLATFORM SITES THAT ARE TO THE NORTH OF 27N
TO THE WEST OF 88W...

ICAO STATION KHQI IS REPORTING A VISIBILITY OF 1 MILE OR LESS
WITH FOG. SCATTERED LOW CLOUDS ARE TO THE WEST OF 92W. A LOW
LEVEL CLOUD CEILING IS AT THE ICAO STATION KMYT AND ICAO STATION
KEIR.

CARIBBEAN SEA...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 16N58W...
INTO THE CARIBBEAN SEA NEAR 15N65W AND 14N72W. RAINSHOWERS ARE
POSSIBLE BETWEEN 60W AND 70W.

MIDDLE LEVEL TO UPPER LEVEL NORTHWESTERLY WIND FLOW MOVES FROM
THE GULF OF MEXICO INTO AND ACROSS THE CARIBBEAN SEA. THE WIND
FLOW REMAINS NORTHWESTERLY EVERYWHERE ELSE...AND IT EVENTUALLY
MERGES WITH THE WIND FLOW THAT IS AROUND THE 16N58W 15N65W
14N72W TROUGH.

UPPER LEVEL SOUTHWESTERLY WIND FLOW FROM SOUTH AMERICA IS TO THE
SOUTH OF 15N60W 13N70W 12N78W.

RAINSHOWERS ARE POSSIBLE ELSEWHERE TO THE NORTH OF 12N BETWEEN
70W AND 80W.

THE MONSOON TROUGH IS ALONG 7N74W IN COLOMBIA...BEYOND 7N83W IN
THE EASTERN PACIFIC OCEAN. CONVECTIVE PRECIPITATION...NUMEROUS
STRONG WITHIN A 30 NM RADIUS OF 3N78W...IN COLOMBIA AND
VENEZUELA FROM 5N TO 7N BETWEEN 71W AND 72W...WIDELY SCATTERED
MODERATE TO ISOLATED STRONG FROM 2N TO 7N TO THE EAST OF 86W IN
THE EASTERN PACIFIC OCEAN...AND FROM 3N TO 8N BETWEEN 72W AND
77W IN COLOMBIA.

ATLANTIC OCEAN...
A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N76W TO
27N76W AND 25N72W. A SURFACE TROUGH PASSES THROUGH 32N74W TO THE
ABACO ISLANDS IN THE NORTHERN BAHAMAS...TO CUBA NEAR 23N82W.
CONVECTIVE PRECIPITATION...WIDELY SCATTERED TO SCATTERED
MODERATE AND ISOLATED STRONG TO THE NORTH OF 19N BETWEEN 68W AND
77W...FROM THE WINDWARD PASSAGE...TO THE ATLANTIC OCEAN ON THE
SOUTHERN SIDE OF THE CENTRAL BAHAMAS...INTO THE OPEN WATERS OF
THE ATLANTIC OCEAN.

A SURFACE RIDGE PASSES THROUGH 32N58W TO 25N60W TO 20N61W...JUST
OUTSIDE THE NORTHEASTERN CORNER OF THE CARIBBEAN SEA.

A MIDDLE LEVEL TO UPPER LEVEL TROUGH EXTENDS FROM A 34N33W
CYCLONIC CIRCULATION CENTER... PASSING THROUGH 32N34W...TO A
SECOND CYCLONIC CIRCULATION CENTER THAT IS NEAR 29N39W... TO
21N47W AND 16N58W...INTO THE CARIBBEAN SEA NEAR 15N65W AND
14N72W. A SURFACE TROUGH EXTENDS FROM A 1007 MB LOW PRESSURE
CENTER THAT IS NEAR 33N33W...TO 27N36W 24N40W AND 23N43W.
CONVECTIVE PRECIPITATION...SCATTERED MODERATE TO ISOLATED STRONG
TO THE NORTH OF 28N BETWEEN 27W AND 34W. RAINSHOWERS ARE
POSSIBLE ELSEWHERE TO THE NORTH AND NORTHWEST OF THE LINE THAT
PASSES THROUGH 32N25W 24N33W TO 20N40W AND 20N70W.

AN EASTERN ATLANTIC OCEAN SURFACE RIDGE PASSES THROUGH 32N20W TO
25N25W...TO A 1016 MB HIGH PRESSURE CENTER THAT IS NEAR
18N32W...TO 10N45W.

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

$$
MT


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