000
AXNT20 KNHC 091055
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT THU JUL 09 2009

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...METEOROLOGICAL ANALYSIS...WEATHER
OBSERVATIONS...AND RADAR.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1015 UTC.

...TROPICAL WAVES...

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 50W TO THE SOUTH OF 17N 
MOVING WESTWARD 15 TO 20 KT. SCATTERED MODERATE SHOWERS TO 
ISOLATED STRONG ITCZ PRECIPITATION FROM 8N TO 12N BETWEEN 49W 
AND 58W.

A TROPICAL WAVE IS IN THE SOUTHWESTERN GULF OF MEXICO ALONG
94W/95W CROSSING THE ISTHMUS OF TEHUANTEPEC AND GOING INTO THE 
EASTERN PACIFIC OCEAN. POSSIBLE SHOWERS FROM 14N TO 20N BETWEEN 
93W AND 98W.

...THE ITCZ...

FROM AFRICA NEAR 10N14W TO 8N30W TO 8N48W...INTO NORTHEASTERN
VENEZUELA NEAR 8N63W. ISOLATED MODERATE SHOWERS WITHIN 240 NM
ON EITHER SIDE OF THE ITCZ TO THE EAST OF 20W...WITHIN 150 NM
ON EITHER SIDE OF THE ITCZ BETWEEN 20W AND 30W...AND FROM
2N TO 7N BETWEEN 30W AND 50W.

...DISCUSSION...

THE GULF OF MEXICO AND INTERIOR MEXICO...
AN UPPER LEVEL TROUGH IS DIGGING INTO THE EAST CENTRAL GULF 
WATERS BRINGING ISOLATED MODERATE SHOWERS TO THAT AREA.
A SEPARATE UPPER LEVEL CYCLONIC CENTER ALONG THE MEXICO COAST
NEAR 19N96W IN THE SOUTHWESTERN CORNER HAS HARDLY ANY 
PRECIPITATION WITH IT. THE CONVECTIVE PRECIPITATION FROM SIX
HOURS AGO THAT WAS COVERING THE AREA FROM HONDURAS TO GUATEMALA 
AND THE YUCATAN PENINSULA HAS WEAKENED A LOT EVEN THOUGH
SOMETHING STILL LINGERS. THE EARLIER NORTHWESTERN MEXICO
PRECIPITATION ALSO HAS DISSIPATED.

THE CARIBBEAN SEA AND THE ATLANTIC OCEAN TO THE SOUTH OF 26N
TO THE WEST OF 50W...
SOME LINGERING SHOWERS REMAIN FROM THE WATERS TO THE EAST OF
THE GULF OF HONDURAS...HONDURAS/BELIZE...AND GUATEMALA.
ONE UPPER LEVEL TROUGH PASSES FROM 25N72W IN THE ATLANTIC OCEAN
INTO THE SOUTHWESTERN CORNER OF THE AREA...WITH NO 
PRECIPITATION. A SECOND UPPER LEVEL TROUGH PASSES GOES FROM
23N61W IN THE ATLANTIC OCEAN TO COASTAL VENEZUELA. A SURFACE
TROUGH GOES FROM 25N50W TO 24N57W TO PUERTO RICO. SHOWERS ARE 
WITHIN 15 NM TO 30 NM ON EITHER SIDE OF THIS TROUGH...AND
ABOUT 75 NM TO THE SOUTH OF THE EASTERN DOMINICAN REPUBLIC
AND WESTERN PUERTO RICO.

THE REST OF THE ATLANTIC OCEAN...
AN UPPER LEVEL TROUGH EXTENDS FROM A CYCLONIC CIRCULATION CENTER 
NEAR 32N20W TO A SECOND CYCLONIC CENTER NEAR 28N27W TO 16N32W. 
NO DEEP CONVECTIVE PRECIPITATION ACCOMPANIES THIS TROUGH.

$$
MT