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Atlantic Tropical Weather Discussion



000
AXNT20 KNHC 191119
TWDAT 

TROPICAL WEATHER DISCUSSION 
NWS NATIONAL HURRICANE CENTER MIAMI FL 
705 AM EST FRI DEC 19 2014

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.

...THE ITCZ/THE MONSOON TROUGH...                                

THE MONSOON TROUGH CROSSES THE AFRICAN COAST NEAR 09N14W AND 
CONTINUES OVER THE EASTERN ATLANTIC TO NEAR 07N16W WHERE THE 
ITCZ BEGINS AND CONTINUES ALONG 06N32W TO THE NORTHERN COAST OF 
BRAZIL NEAR 02N50W. SCATTERED MODERATE CONVECTION IS FROM 02N-
08N E OF 38W.

...DISCUSSION...

GULF OF MEXICO... 

AN UPPER-LEVEL SW TO W FLOW PREVAILS ACROSS THE BASIN ADVECTING 
MOISTURE FROM THE ITCZ IN THE EPAC MAINLY TO THE NORTHERN GULF 
WATERS. LOW-LEVEL MOISTURE CONVERGENCE ALONG WITH MOISTURE ALOFT 
SUPPORT SCATTERED MODERATE CONVECTION AND N OF 24N...W OF 87W. A 
1014 MB SURFACE LOW IS OVER E CENTRAL MEXICO NEAR 22N98W. TO THE 
N...A STATIONARY FRONT EXTENDS ALONG 28N96W TO 28N94W TO 27N92W. 
A SURFACE RIDGE COVERING THE CENTRAL AND EASTERN U.S. ANCHORED 
BY A 1027 MB HIGH CENTERED OVER W ILLINOIS EXTENDS SE INTO THE 
NE GULF WATERS. RETURN FLOW OF 5-15 KT ASSOCIATED WITH THIS 
RIDGE CONTINUES TO ADVECT DRY COOL AIR ACROSS THE REMAINDER 
BASIN...SUPPORTING FAIR WEATHER AND CLEAR SKIES. OVER THE NEXT 
48 HOURS...THE NEXT COLD FRONT WILL DEVELOP AND ENTER THE W GULF 
WATERS ENHANCING CONVECTION. 

CARIBBEAN SEA...   

A SURFACE TROUGH OVER THE WESTERN BASIN EXTENDING FROM 20N85W TO 
16N84W TO 11N83W. A HIGH LOW-LEVEL MOISTURE PLUME EXTENDS ACROSS 
THE NW BASIN W OF 79W...WHICH ALONG THE SURFACE TROUGH ENHANCES 
SCATTERED MODERATE CONVECTION FROM 15N-20N BETWEEN 80W-87W. A 
SMALL UPPER-LEVEL TROUGH EXTENDS FROM THE ATLANTIC INTO THE 
EASTERN CARIBBEAN MAINLY E OF 67W AFFECTING THE LEEWARD ISLANDS 
AND PUERTO RICO. THIS TROUGH ALONG WITH LOW LEVEL MOISTURE IS 
PRODUCING ISOLATED CONVECTION ACROSS THESE ISLANDS AND THEIR 
ADJACENT WATERS. FAIR WEATHER PREVAILS ELSEWHERE ACROSS THE 
BASIN SUPPORTED BY DRY AIR SUBSIDENCE FROM ALOFT. TRADES OF 10-
15 KT DOMINATE ACROSS THE BASIN. THE SURFACE TROUGH IS FORECAST 
TO DISSIPATE LATER TODAY...HOWEVER LINGERING MOISTURE ASSOCIATED 
WITH IT MAY STILL ENHANCE ISOLATED CONVECTION OVER THE NW BASIN 
THROUGH LATE SATURDAY.

HISPANIOLA...                   

DRY AIR PREVAILS ACROSS THE ISLAND PROMOTING FAIR WEATHER 
CONDITIONS. SIMILAR PATTERN IS EXPECTED TO CONTINUE OVER THE 
NEXT 24 HOURS. MOISTURE IS EXPECTED TO INCREASE BY SATURDAY 
INCREASING THE CHANCE OF SHOWERS FOR THE WEEKEND.

ATLANTIC OCEAN...   

A PAIR OF COLD FRONTS ARE MOVING ACROSS THE W ATLANTIC. THE 
FIRST FRONT EXTENDS FROM 31N72W TO 37N57W THEN INTO THE N 
ATLANTIC WITH NO SIGNIFICANT CONVECTION ASSOCIATED TO IT. TO THE 
E...ANOTHER COLD FRONT EXTENDS FROM 25N75W TO 32N58W TO 43N50W. 
SCATTERED MODERATE CONVECTION REMAINS N OF 34N BETWEEN 46W-53W. 
FURTHER E...AN UPPER-LEVEL TROUGH WITH AXIS ALONG 48W SUPPORTS A 
1014 MB SURFACE LOW CENTERED NEAR 26N44W AND ITS ASSOCIATED COLD 
FRONT THAT EXTENDS FROM THE LOW CENTER TO 21N46W. A STATIONARY 
FRONT EXTENDS N FROM THIS LOW ALSO TO 44N28W. SCATTERED MODERATE 
CONVECTION IS OBSERVED FROM 19N-36N BETWEEN 36W-47W. A 1034 MB 
HIGH CONTINUES NEAR 39N19W SUPPORTING FAIR WEATHER ACROSS THE E 
ATLANTIC. OVER THE NEXT 48 HOURS...EXPECT FOR THE FRONT ACROSS 
THE W ATLANTIC TO MOVE E WHILE WEAKENING. THE LOW OVER THE 
CENTRAL ATLANTIC WILL MOVE N ENHANCING CONVECTION WHILE THE 
FRONTS ASSOCIATED TO IT WILL WEAKEN. 

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

$$
ERA



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Page last modified: Friday, 19-Dec-2014 11:19:54 UTC