000
AXNT20 KNHC 270509
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
105 AM EST SAT JAN 27 2007

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...
CENTRAL AMERICA...THE GULF OF MEXICO...THE CARIBBEAN SEA...
NORTHEASTERN SECTIONS OF SOUTH AMERICA...AND THE 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0445 UTC.

...THE ITCZ...
ITCZ AXIS CENTERED ALONG 7N10W 3N24W 1N37W CROSSING THE EQUATOR 
NEAR 46W. CLUSTERS OF SCATTERED MODERATE CONVECTION ARE FROM 
2N-6N BETWEEN 21W-44W. 

...DISCUSSION...
GULF OF MEXICO...
SURFACE HIGH PRESSURE DOMINATES MUCH OF THE GULF TONIGHT WITH A 
1016 MB LOW DEVELOPING ALONG THE COAST OF TEXAS AND A DOUBLE 
1024 MB HIGHS CENTERED OVER THE SE US/FAR W ATLC. THE HIGH 
PRESSURE CONTINUES TO SHIFT E EXTENDING INTO THE W ATLC W OF 
70W. A LINGERING SURFACE TROUGH EXTENDS FROM THE BAY OF CAMPECHE 
ALONG 19N93 TO 24N97W. UPPER LEVEL RIDGE ALSO DOMINATES THE GULF 
EXTENDING FROM THE CARIBBEAN OVER THE E GULF AND INTO THE FAR W 
ATLC. TROPICAL MOISTURE FROM THE E PACIFIC REGION IS STREAMING 
ACROSS MEXICO INTO THE W GULF BRINGING BROKEN/OVERCAST DEEP 
LAYER CLOUDINESS OVER W GULF W OF 88W WITH LIGHT RAIN/DRIZZLE 
WITH MODERATE EASTERLY WINDS. CLEAR SKIES...WITH VERY DRY 
MID/UPPER AIR IN PLACE...IS OVER THE REMAINDER OF THE GULF. 
SURFACE LOW IS EXPECTED TO MOVE INTO THE NE GULF LATER TODAY 
BRINGING ANOTHER COLD FRONT THROUGH THE GULF THROUGH THE 
WEEKEND. 
 
CARIBBEAN SEA...
REMNANT FRONTAL BOUNDARY EXTENDS ACROSS E CUBA TO NE HONDURAS 
WITH BROKEN LOW/MID CLOUDS AND ISOLATED SHOWERS OVER THE NW 
CARIBBEAN. MODERATE EASTERLY TRADE WINDS ARE ACROSS THE 
AREA. VERY DRY MID/UPPER AIR CONTINUES OVER THE AREA WITH AN 
UPPER RIDGE AXIS EXTENDING FROM OVER SOUTH AMERICA ACROSS CUBA 
INTO THE E GULF OF MEXICO. ISOLATED LOW LEVEL SHOWERS DOT THE NE 
CARIBBEAN N OF 15N E OF 73W TO ACROSS THE LEEWARD ISLANDS. 
FRONT WILL CONTINUE TO WEAKEN IN THE NW CARIBBEAN LATER TODAY 
BEFORE ANOTHER FRONT MOVES INTO THE FAR NW BY LATE IN THE 
WEEKEND. MODERATE TRADES WILL PERSIST ACROSS THE AREA. 

ATLANTIC OCEAN...
SURFACE HIGH PRESSURE IS BUILDING INTO THE SW ATLC BEHIND THE 
STRONG COLD FRONT THAT ENTERS THE REGION NEAR 32N49W EXTENDING 
SW TO THE TURKS AND CAICOS ISLANDS WITH A REMNANT FRONTAL 
BOUNDARY CONTINUING INTO THE NW CARIBBEAN. A GALE WARNING IS IN 
EFFECT FOR BOTH PRE-FRONTAL AND POST-FRONTAL WINDS IN THE N 
PORTION OF THE AREA...SEE HIGH SEAS FORECAST UNDER HEADER 
MIAHSFAT2 FOR MORE DETAILS. BROKEN/OVERCAST LOW/MID CLOUDS WITH 
ISOLATED SHOWERS ARE WITHIN 150 NM NW OF THE FRONT. SCATTERED/ 
BROKEN COLD AIR STRATOCUMULUS CLOUDS ARE ELSEWHERE BEHIND THE 
FRONT TO 80W. THE FRONT IS ASSOCIATED WITH STRONG DEEP LAYERED 
LOW NEAR THE CANADIAN MARITIMES WITH THE UPPER TROUGH EXTENDING 
S OVER THE W ATLC N OF 26N W OF 55W. A WEAK 1019 MB SURFACE HIGH 
IS OVER THE CENTRAL ATLC NEAR 23N43W. UPPER RIDGE IS OVER THE 
CENTRAL ATLC BETWEEN 32W-55W. A SECOND DEEP LAYERED LOW IS OVER 
THE E ATLC W OF THE CANARY ISLANDS NEAR 27N23W. ASSOCIATED 1005 
MB SURFACE LOW IS CENTERED NEAR 28N22W WITH A SURFACE TROUGH 
EXTENDING E ALONG 26N19W THEN SW TO 20N34W AND IS EXPECTED TO 
CONTINUE MOVING SE LATER TODAY THEN WEAKEN STEADILY THROUGH SUN. 
SHOWERS/SCATTERED THUNDERSTORMS ARE FROM 22N-32N E OF 23W TO 
INLAND OVER NW AFRICA WHICH INCLUDES THE CANARY ISLANDS. 

$$
WALLACE