930
AXNT20 KNHC 200013
TWDAT
TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
0015 UTC FRI DEC 20 2024
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 31N. THE FOLLOWING INFORMATION IS BASED ON SATELLITE
IMAGERY, WEATHER OBSERVATIONS, RADAR AND METEOROLOGICAL ANALYSIS.
BASED ON 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
2230 UTC.
.MONSOON TROUGH/ITCZ
THE MONSOON TROUGH ENTERS THE ATLANTIC NEAR 03N10E AND EXTENDS TO
04N02W. THE ITCZ CONTINUES FROM 04N02W TO 05N14W TO 00N50W.
SCATTERED MODERATE CONVECTION IS OBSERVED FROM 03N TO 06N BETWEEN
28W AND 45W.
..GULF OF MEXICO
A COLD FRONT EXTENDS FROM JUST N OF TAMPA BAY TO JUST SOUTH OF
TAMPICO, MEXICO. A SURFACE TROUGH EXTENDS JUST OFFSHORE THE
MEXICAN COAST FROM S OF TAMPICO MEXICO TO THE CENTRAL BAY OF
CAMPECHE. NO SIGNIFICANT CONVECTION IS NOTED IN ASSOCIATION WITH
THESE FEATURES. MAINLY MODERATE NE TO N WINDS ENCOMPASS THE BASIN
ON BOTH SIDES OF THE COLD FRONT. SEAS ARE 2 TO 5 FT, HIGHEST IN
THE WESTERN GULF.
FOR THE FORECAST, THE AFOREMENTIONED COLD FRONT WILL PROGRESS
SOUTHEASTWARD TONIGHT BEFORE WEAKENING ON FRI ACROSS THE SOUTHERN
GULF THEN DISSIPATING ACROSS THE YUCATAN CHANNEL ON SAT. FRESH N
TO NE WINDS WILL OCCUR ALONG AND BEHIND OF THE FRONT TONIGHT. A
REINFORCING COLD FRONT WILL ENTER THE NORTHERN GULF OF MEXICO FRI
EVENING AND PROGRESS SOUTHWARD THROUGH THE WEEKEND BEFORE
DISSIPATING OVER THE SOUTHEASTERN GULF SUN. FRESH TO LOCALLY
STRONG N WINDS AND A MODEST INCREASE IN SEAS WILL OCCUR BEHIND
THIS FRONT FRI NIGHT IN THE NORTHERN GULF. MODERATE NE WINDS WILL
THEN PREVAIL ACROSS THE BASIN ON SAT. LOOKING AHEAD, HIGH PRESSURE
BUILDING ACROSS THE BASIN BEHIND THIS SECOND FRONT WILL SHIFT
SLOWLY EASTWARD ACROSS THE EASTERN UNITED STATES LATE SAT THROUGH
MON, LEADING TO MODERATE NE TO E WINDS ACROSS MOST OF THE GULF OF
MEXICO INTO EARLY NEXT WEEK.
..CARIBBEAN SEA
A SURFACE THROUGH THAT EXTENDS FROM BELIZE EASTWARD JUST OFFSHORE
THE HONDURAS COAST IS INDUCING SCATTERED MODERATE CONVECTION.
THE EASTERN EXTENSION OF THE EAST PACIFIC MONSOON TROUGH ALSO
EXTENDS ACROSS THE SW CARIBBEAN AND IS SUPPORTING SCATTERED
MODERATE CONVECTION NEAR THE COASTS OF NICARAGUA AND COSTA RICA. A
TIGHT PRESSURE GRADIENT BETWEEN THESE FEATURES AND HIGH PRESSURE
IN THE CENTRAL ATLANTIC IS SUPPORTING FRESH E TO NE WINDS FROM
THE SOUTHWESTERN THROUGH EASTERN CARIBBEAN, WITH LOCALLY STRONG
ENE WINDS OFF THE COAST OF COLOMBIA AND IN THE GULF OF VENEZUELA.
GENTLE TO MODERATE NE WINDS ARE OCCURRING IN THE NORTHWESTERN
BASIN. MODERATE SEAS ARE NOTED ACROSS MUCH OF THE BASIN, WITH THE
EXCEPTION OF THE NW CARIBBEAN WHERE SEAS OF 2 TO 4 FT ARE NOTED.
LONG PERIOD NORTHERLY SWELL IS ENTERING THE NE CARIBBEAN THROUGH
ATLANTIC PASSAGES, LEADING TO LOCALIZED SEAS OF 8 TO 9 FT.
FOR THE FORECAST, FRESH TRADE WINDS WILL CONTINUE ACROSS THE
EASTERN, CENTRAL AND SOUTHWESTERN CARIBBEAN, AS WELL AS ATLANTIC
PASSAGES THROUGH FRI MORNING, AS A STRONG PRESSURE GRADIENT
BETWEEN HIGH PRESSURE IN THE NORTH CENTRAL ATLANTIC AND THE
COLOMBIAN LOW PREVAILS. WINDS WILL PULSE TO STRONG SPEEDS OFFSHORE
OF COLOMBIA AND VENEZUELA TONIGHT. ELSEWHERE, GENTLE TO MODERATE
NE WINDS ARE EXPECTED IN THE NORTHWESTERN BASIN TONIGHT. HIGH
PRESSURE BUILDING OVER THE GULF OF MEXICO FRI THROUGH THIS WEEKEND
WILL LEAD TO GENERALLY MODERATE TO LOCALLY FRESH E TO NE WINDS
ACROSS THE BASIN THROUGH THE WEEKEND, EXCEPT FOR N TO NE WINDS
ACROSS NORTHWEST PORTIONS. LOOKING AHEAD, THE HIGH PRESSURE WILL
SHIFT SLOWLY EASTWARD AND INTO THE WESTERN ATLANTIC EARLY NEXT
WEEK TO PROMOTE FRESH TO LOCALLY STRONG NE TO E WINDS ACROSS MUCH
OF THE CARIBBEAN.
..ATLANTIC OCEAN
FRESH EASTERLY TRADEWINDS DOMINATE WATERS S OF 25N, WITH SOME
STRONG EASTERLY WINDS FROM 20N TO 25N BETWEEN 50W AND 60W
RESULTING FROM THE PRESSURE GRADIENT BETWEEN HIGH PRESSURE N OF
THE AREA AND THE LOWER PRESSURE OF THE TROPICS. A MIXTURE OF WIND
WAVES AND SLOWLY DECAYING NORTHERLY SWELL IS LEADING TO WIDESPREAD
SEAS OF 5 TO 8 IN THE TRADEWIND BELT, WITH A ZONE OF 8 TO 11 FT
SEAS IN THE REGION OF STRONG EASTERLIES AS WELL AS ATLANTIC WATERS
APPROACHING THE ANTILLES W OF 50W.
A 1016 MB LOW PRESSURE CENTER NEAR 31N40W IS INDUCING GALES N OF
THE AREA, WITH A TRAILING STATIONARY FRONT ALONG 40W TO ABOUT 24N.
SCATTERED MODERATE CONVECTION IS NOTED AHEAD OF THE FRONT TO ABOUT
30W, WHERE STRONG SE WINDS ARE ALSO OCCURRING. SEAS OF 8 TO 11 FT
AREA ASSOCIATED WITH THIS SYSTEM AND EXTEND EASTWARD TO THE CANARY
ISLANDS. VERY ROUGH SEAS, PEAKING NEAR 14 FT ARE BEING GENERATED
BY THE GALES TO THE NORTH, AND ARE IMPACTING WATERS N OF 29N
BETWEEN 40W AND 45W. TO THE WEST, A SURFACE TROUGH, AHEAD OF A
COLD FRONT WEST OF THE AREA, EXTENDS SOUTHWARD TO THE NW BAHAMAS.
SCATTERED MODERATE CONVECTION IS NOTED WITHIN ABOUT 60 NM EITHER
SIDE OF THIS TROUGH AXIS.
FOR THE FORECAST W OF 55W, A BROAD FETCH OF FRESH NE TO E WINDS
WILL CONTINUE TONIGHT NORTH OF 15N AND BETWEEN THE SE BAHAMAS AND
55W, AS A TIGHT PRESSURE GRADIENT PREVAILS BETWEEN HIGH PRESSURE
IN THE NORTH-CENTRAL ATLANTIC AND THE COLOMBIAN LOW. VERY ROUGH
SEAS TO 11 FT WILL OCCUR THROUGH EARLY TONIGHT FROM 18N TO 24N
EAST OF 68W. ROUGH SEAS NORTH OF 15N THIS EVENING WILL BEGIN TO
SLOWLY SUBSIDE FROM NORTH TO SOUTH LATE TONIGHT THROUGH EARLY SAT.
SOUTH OF 15N, MODERATE TO LOCALLY FRESH TRADES AND ROUGH SEAS
WILL DIMINISH TO MODERATE SPEEDS ON FRI. A COLD FRONT WILL STALL
OFF THE COAST OF THE SOUTHEASTERN UNITED STATES TONIGHT, THEN
ENTER THE NW ZONES OFF OF FLORIDA ON FRI, AND REACH FROM 31N68W TO
WESTERN CUBA BY SAT MORNING, THEN WEAKEN FROM 31N59W TO NEAR THE
WINDWARD PASSAGE SUN MORNING. FRESH TO STRONG W TO NW WINDS WILL
OCCUR BEHIND THE FRONT N OF 28N. LOOKING AHEAD, WIDESPREAD FRESH
TO LOCALLY STRONG NE WINDS AND ROUGH SEAS WILL REDEVELOP ACROSS
AREAS NORTH OF 20N SUN NIGHT THROUGH EARLY NEXT WEEK AS STRONG
HIGH PRESSURE BUILDS ACROSS THE REGION BEHIND THE WEAKENING FRONT.
KONARIK
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