041
AXNT20 KNHC 150950
TWDAT
TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1215 UTC TUE SEP 15 2026
TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA, CENTRAL AMERICA
GULF OF AMERICA, 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
0925 UTC.
..TROPICAL WAVES
A SHARP TROPICAL WAVE IS ALONG 55W, SOUTH OF 21N, MOVING WESTWARD
AT 10-15 KT. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS
OBSERVED FROM 10N TO 21N AND BETWEEN 47W AND 57W.
..MONSOON TROUGH/ITCZ
THE MONSOON TROUGH ENTERS THE ATLANTIC ALONG THE COAST OF GUINEA
NEAR 11N15W AND CONTINUES TO 08N36W. THE ITCZ EXTENDS FROM 08N37W
TO 11N54W. SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS
NOTED FROM 04N TO 17N AND EAST OF 25W.
..GULF OF AMERICA
A FEW SHOWERS AND ISOLATED THUNDERSTORMS ARE OCCURRING IN THE
EASTERN GULF WATERS AND OFF VERACRUZ. A WEAK HIGH PRESSURE OVER
THE NE GULF SUPPORTS MODERATE TO FRESH SE-E WINDS AND MODERATE
SEAS IN THE BAY OF CAMPECHE AND IN THE WESTERN GULF, WEST OF 95W.
ELSEWHERE, LIGHT TO GENTLE WINDS AND SLIGHT SEAS PREVAIL.
FOR THE FORECAST, A STRONG HIGH PRESSURE OVER THE EASTERN UNITED
STATES WILL BUILD SOUTHWARD BEHIND A WEAKENING COLD FRONT THAT
WILL SPREAD ACROSS THE EASTERN GULF WATERS. THE TIGHTER PRESSURE
GRADIENT WILL SUPPORT FRESH TO LOCALLY STRONG NE-E WINDS AND ROUGH
SEAS STARTING IN THE NE GULF TONIGHT AND SPREADING OVER THE
NORTHERN GULF WATERS THROUGH THU NIGHT. ELSEWHERE, A DIURNAL
TROUGH WILL MOVE WESTWARD OFFSHORE THE YUCATAN PENINSULA EACH
EVENING THROUGH THU NIGHT, BRINGING NIGHTLY PULSES OF FRESH TO
LOCALLY STRONG NE WINDS. CONDITIONS WILL IMPROVE ACROSS THE BASIN
FRI, ALLOWING FOR MODERATE OR WEAKER WINDS AND SLIGHT TO MODERATE
SEAS DURING THE WEEKEND.
..CARIBBEAN SEA
THE INTERACTION BETWEEN AN LARGE UPPER-LEVEL LOW PRESSURE SYSTEM
OVER THE NORTH-CENTRAL CARIBBEAN AND TROPICAL MOISTURE SUPPORT
NUMEROUS SHOWERS AND THUNDERSTORMS OVER THE SW CARIBBEAN. THIS
ENVIRONMENT IS ALSO GENERATING A FEW SHOWERS IN THE EASTERN
CARIBBEAN, BRINGING SOME RAIN TO PUERTO RICO AND THE VIRGIN
ISLANDS.
HIGH PRESSURE NORTH OF THE AREA SUSTAINS FRESH TO NEAR GALE-FORCE
EASTERLY TRADE WINDS AND MODERATE TO ROUGH SEAS ACROSS MUCH OF
THE CENTRAL CARIBBEAN. MODERATE TO FRESH NE-E WINDS AND MODERATE
SEAS ARE OCCURRING IN THE EASTERN CARIBBEAN, WINDWARD PASSAGE AND
LEE OF CUBA. ELSEWHERE, MODERATE OR WEAKER WINDS AND MODERATE SEAS
PREVAIL.
FOR THE FORECAST, TIGHT PRESSURE GRADIENT BETWEEN THE SUBTROPICAL
RIDGE LOCATED NORTH OF THE ISLANDS AND LOWER PRESSURES IN
COLOMBIA WILL SUPPORT FRESH TO LOCALLY NEAR GALE-FORCE EASTERLY
TRADE WINDS AND MODERATE TO ROUGH SEAS ACROSS MUCH OF THE
CENTRAL CARIBBEAN, WITH MODERATE TO FRESH TRADES ELSEWHERE FROM
11N TO 18N. THESE CONDITIONS WILL PERSIST THROUGH THE WORKWEEK.
ELSEWHERE, MODERATE OR LIGHTER WINDS AND SLIGHT TO MODERATE SEAS
ARE EXPECTED, EXCEPT MODERATE TO FRESH MAINLY IN THE EVENINGS
NEAR THE WINDWARD PASSAGE AND LEE OF CUBA THROUGH MIDWEEK. WINDS
MAY DIMINISH ACROSS THE BASIN BY THE END OF THE WEEK INTO THE
UPCOMING WEEKEND AS THE PRESSURES GRADIENT RELAXES, WITH SEAS
ALSO SLIGHTLY SUBSIDING.
..ATLANTIC OCEAN
A PRE-FRONTAL TROUGH IS NOTED AHEAD OF AN APPROACHING COLD FRONT
TO THE NW WATERS PRODUCING SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS NORTH OF 28N AND BETWEEN 67W AND 75W. MEANWHILE, A
LARGE UPPER-LEVEL LOW OVER AND EAST OF THE SE BAHAMAS IS
SUPPORTING SCATTERED SHOWERS SOUTH OF 25N AND BETWEEN 61W AND 75W.
HIGH PRESSURE DOMINATES THE REST OF THE SW NORTH ATLANTIC,
SUSTAINING MODERATE OR WEAKER WINDS AND SLIGHT TO MODERATE.
ANOTHER UPPER-LEVEL LOW OVER THE CENTRAL ATLANTIC INTERACTS WITH A
SURFACE TROUGH ANALYZED ALONG 51W AND NORTH OF 24N, PRODUCING
NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS NORTH OF 26N AND
BETWEEN 45W AND 61W. ENVIRONMENTAL CONDITIONS ARE FORECAST TO
BECOME MORE CONDUCIVE FOR DEVELOPMENT IN A FEW DAYS, AND A
TROPICAL DEPRESSION COULD FORM LATE THIS WEEK AS THE SYSTEM MOVES
SLOWLY WEST-NORTHWESTWARD OVER THE SUBTROPICAL ATLANTIC. THE
SYSTEM HAS A MEDIUM CHANCE OF FORMATION OVER THE NEXT 7 DAYS. A
STRONG SUBTROPICAL RIDGE CENTERED NORTH OF THE AZORES EXTENDS
SOUTHWARD INTO THE CENTRAL AND EASTERN ATLANTIC, SUPPORTING
MODERATE TO FRESH EASTERLY WINDS AND MODERATE SEAS BETWEEN 30W AND
60W. MODERATE OR WEAKER WINDS AND MODERATE SEAS ARE PREVALENT
ELSEWHERE.
FOR THE FORECAST WEST OF 55W, A COLD FRONT IS APPROACHING THE
WATERS OFF NE FLORIDA AND THEN WILL BECOME STATIONARY FROM
BERMUDA TO THE NW BAHAMAS INTO WED. A TIGHT PRESSURE GRADIENT
BETWEEN THE BUILDING RIDGE OVER THE EASTERN UNITED STATES AND THE
FRONT WILL RESULT IN FRESH TO LOCALLY STRONG NE WINDS AND SEAS TO
BUILD TO ROUGH N OF THE BAHAMAS AND W OF 70W THROUGH EARLY THU.
CONDITIONS WILL IMPROVE LATER THU INTO FRI. DURING THE MIDDLE TO
LATER PORTION OF THE WEEK, A TROUGH OF LOW PRESSURE IS FORECAST TO
MOVE WEST- NORTHWESTWARD INTO THE NE PORTION OF THE WATERS,
BRINGING THUNDERSTORMS WHILE ALSO WEAKENING THE HIGH AND PRESSURE
GRADIENT.
DELGADO
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page