000
AXNT20 KNHC 301746
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
105 PM EST TUE NOV 30 2010

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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
1715 UTC.

...ITCZ...
 
THE ITCZ AXIS IS ANALYZED ALONG 8N12W 5N20W 8N30W 10N46W TO 
INLAND OVER SOUTH AMERICA NEAR 9N62W. CLUSTERS OF SCATTERED 
MODERATE/STRONG CONVECTION ARE FROM 3N-8N BETWEEN 13W-21W. 
CLUSTERS OF SCATTERED MODERATE/ISOLATED STRONG CONVECTION ARE 
FROM 3N-10N BETWEEN 21W-38W...FROM 10N-13N BETWEEN 41W-47W...AND 
FROM 7N-11N BETWEEN 50W-61W. 

...DISCUSSION...

GULF OF MEXICO...
BROAD UPPER TROUGH IS OVER THE CENTRAL PLAIN STATES ACROSS THE 
MISSISSIPPI VALLEY TO THE APPALACHIAN MOUNTAINS ALSO COVERING 
THE NW GULF WATERS FROM PENSACOLA FLORIDA TO TUXPAN MEXICO 
SUPPORTING A STRONG COLD FRONT THAT AT 30/1500 UTC ENTERS THE 
GULF NEAR BILOXI MISSISSIPPI EXTENDING ALONG 26N93W TO INLAND 
OVER MEXICO N OF VERACRUZ NEAR 20N97W THEN CONTINUING AS A 
STATIONARY FRONT ALONG THE E SLOPES OF THE SIERRA MADRE 
MOUNTAINS WITH SCATTERED SHOWERS/ISOLATED THUNDERSTORMS WITHIN 
30/45 NM OF LINE FROM 25N93W TO INLAND OVER ALABAMA NEAR MOBILE. 
A JET STREAM IS INLAND OVER THE SE U.S. FROM ACROSS TEXAS TO THE 
CENTRAL MISSISSIPPI VALLEY AND COVERS THE NW GULF WITH WINDS OF 
85 TO 105 KT N OF LINE FROM JUST S OF BROWNSVILLE TEXAS TO 
PENSACOLA FLORIDA. THE SURFACE RIDGE ANCHORED IN THE W ATLC IS 
RETREATING EASTWARD AHEAD OF THE FRONT COVERING THE FAR E GULF E 
OF 85W WITH RETURN SOUTHERLY SURFACE FLOW E OF THE FRONT. AN 
UPPER RIDGE THAT COVERS THE CARIBBEAN SEA COVERS THE REMAINDER 
OF THE GULF WITH STRONG SUBSIDENCE AND DRY STABLE AIR S OF THE 
JET STREAM WINDS LEAVING THE SE GULF UNDER FAIR CONDITIONS THIS 
AFTERNOON. SHOWERS/THUNDERSTORMS WILL CONTINUE TO MOVE E ACROSS 
THE REMAINDER OF THE GULF AS THE COLD FRONT MOVES SE THEN EXITS 
THE GULF WED EVENING. 

CARIBBEAN SEA...
UPPER RIDE DOMINATES THE CARIBBEAN ANCHORED OFF THE COAST OF 
COLOMBIA NEAR 13N74W. A BROAD AREA OF LOW PRESSURE COVERS THE SW 
CARIBBEAN AND IS ROUGHLY CENTERED NEAR A 1007 MB LOW NEAR 
10N80W. THE ITCZ AXIS EXTENDS ACROSS THE NORTH PORTION OF SOUTH 
AMERICA COUPLED WITH THE SURFACE LOW PRESSURE AND THE PERSISTENT 
AVAILABLE MOISTURE CONTINUES TO GENERATE SCATTERED SHOWERS/ 
ISOLATED THUNDERSTORMS S OF LINE FROM COLOMBIA NEAR 11N75W TO 
NICARAGUA NEAR 13N84W TO INLAND OVER PANAMA AND COSTA RICA. 
SIMILAR ACTIVITY IS S OF 12N TO INLAND OVER VENEZUELA BETWEEN 
62W-AND THE GULF OF VENEZUELA. THE N CARIBBEAN IS DOMINATED BY 
STRONG SUBSIDENCE AND DRY STABLE AIR ALOFT N OF 14N LEAVING THE 
AREA WITH FAIR CONDITIONS THIS AFTERNOON. 
 
ATLANTIC OCEAN...
THE UPPER RIDGE IN THE CARIBBEAN SEA EXTENDS A RIDGE AXIS N 
ACROSS CUBA AND THE FLORIDA PENINSULA COVERING THE FAR W ATLC W 
OF 72W. BROAD UPPER TROUGH COVERS THE REMAINDER OF THE W ATLC 
INTO THE CENTRAL ATLC N OF 21N BETWEEN 38W-72W SUPPORTING A 
COLD FRONT THAT ENTERS THE E/CENTRAL ATLC NEAR 32N42W EXTENDING 
ALONG 26N50W TO 22N58W WHERE IT DISSIPATES TO JUST E OF THE 
TURKS AND CAICOS NEAR 21N71W. SCATTERED SHOWERS ARE WITHIN 60 NM 
E OF THE COLD FRONT WITH ISOLATED SHOWERS WITHIN 90 NM EITHER 
SIDE OF THE DISSIPATING FRONT. A SURFACE RIDGE COVERS THE W ATLC 
N OF 20N W OF THE FRONT AND IS BRIDGING THE FRONT W OF 60W. A 
WEAK SWIRL OF LOW CLOUDS REMAINS IN THE E ATLC WITH A 1010 MB 
LOW CENTERED NEAR 23N39W. A STATIONARY FRONT ENTERS THE FAR NE 
ATLC OVER THE CANARY ISLANDS TO A WEAK 1011 MB LOW NEAR 25N23W. 
NEITHER FEATURE IS PRODUCING ANY SIGNIFICANT WEATHER. 

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

$$
PAW