475
AXNT20 KNHC 171713
TWDAT
TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
1815 UTC WED JUN 17 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1700 UTC.
..SPECIAL FEATURES
NEWLY FORMED TROPICAL STORM ARTHUR IS CENTERED NEAR 28.6N 95.8W AT
17/1500 UTC OR 27 NM ENE OF PORT OCONNOR TEXAS, MOVING NE AT 8 KT.
ESTIMATED MINIMUM CENTRAL PRESSURE IS 1001 MB. MAXIMUM SUSTAINED
WIND SPEED IS 35 KT WITH GUSTS TO 45 KT. NUMEROUS MODERATE TO
SCATTERED STRONG THUNDERSTORMS ARE ACTIVE AROUND 150 NM TO THE
SOUTHEAST OF ARTHUR, AND SCATTERED SHOWERS AND THUNDERSTORMS ARE
ACTIVE ELSEWHERE WITHIN 90 NM TO 270 NM IN THE SOUTHEAST
SEMICIRCLE OF ARTHUR. ROUGH SEAS ARE NOTED WITHIN 180 NM IN THE
SOUTHEAST QUADRANT OF ARTHUR, WITH MAXIMUM SEAS TO 11 FT. THE
STRONGEST WINDS AND ROUGHER SEAS ARE EXPECTED TO REMAIN OFFSHORE
TO THE SOUTHEAST OF ARTHUR AS IT MOVES ALONG THE TEXAS COAST
THROUGH THE AFTERNOON. WINDS AND SEAS WILL DIMINISH OVER THE
NORTHWEST GULF STARTING THIS EVENING AS THE CENTER OF ARTHUR MOVE
INLAND NEAR THE SABINE PASS. HOWEVER, STRONG ONSHORE FLOW AND POOR
MARINE CONDITIONS WILL PERSIST OFF SOUTHWEST LOUISIANA INTO THE
OVERNIGHT HOURS.
PLEASE READ THE LATEST HIGH SEAS FORECAST ISSUED BY THE NATIONAL
HURRICANE CENTER AT WEBSITE-
HTTPS://WWW.NHC.NOAA.GOV/TEXT/MIAHSFAT2.SHTML AND THE LATEST
ARTHUR NHC FORECAST/ADVISORY AND PUBLIC ADVISORY AT
WWW.HURRICANES.GOV FOR MORE DETAILS.
..TROPICAL WAVES
A NEW TROPICAL WAVE IS ALONG THE WEST COAST OF AFRICA, ALONG 16W,
SOUTH OF 17N, MOVING WEST AROUND 10 KT. SCATTERED MODERATE TO
STRONG CONVECTION IS NOTED FROM 05N TO 08N BETWEEN 14W AND 18W.
AN EASTERN ATLANTIC TROPICAL WAVE IS ALONG 35W, SOUTH OF 17N,
MOVING WESTWARD AT 15 KT. NO SIGNIFICANT CONVECTION IS EVIDENT
NEAR THIS TROPICAL WAVE AT THIS TIME.
AN ATLANTIC TROPICAL WAVE IS ALONG 58W, SOUTH OF 17N, MOVING
WESTWARD AT 15-20 KT. NO SIGNIFICANT CONVECTION IS EVIDENT
NEAR THIS TROPICAL WAVE AT THIS TIME.
A CENTRAL CARIBBEAN TROPICAL WAVE IS ALONG 75W, SOUTH OF 17N,
MOVING WESTWARD AT 15-20 KT. SCATTERED MODERATE CONVECTION IS
ACTIVE FROM 15N TO 17N BETWEEN 75W AND 78W.
..MONSOON TROUGH/ITCZ
THE MONSOON TROUGH REMAINS OVER LAND AT THIS TIME. SEGMENTS OF THE
ITCZ EXTEND FROM 06N19W TO 07N33W, AND FROM 06N37W TO 03N51W.
SCATTERED MODERATE CONVECTION IS ACTIVE FROM 03N TO 06N BETWEEN
20W AND 30W, AND FROM 05N TO 07N BETWEEN 37W AND 42W.
..GULF OF AMERICA
PLEASE REFER TO THE SPECIAL FEATURES SECTION ABOVE FOR DETAILS ON
NEWLY FORMED TROPICAL STORM ARTHUR ALONG THE MIDDLE TEXAS COAST.
OUTSIDE OF THE CONDITIONS CONCERNING TROPICAL STORM ARTHUR
DISCUSSED ABOVE IN THE THE SPECIAL FEATURES SECTION, THE REMAINDER
OF THE GULF IS UNDER THE INFLUENCE OF THE SUBTROPICAL RIDGE THAT
EXTENDS FROM THE WESTERN ATLANTIC, ACROSS FLORIDA INTO THE CENTRAL
GULF. THIS PATTERN IS SUPPORTING FRESH TO STRONG SE TO S WINDS
ACROSS THE CENTRAL GULF, WHERE SEAS ARE ESTIMATED TO BE 5-7 FT.
GENTLE TO MODERATE SE TO S WINDS PERSIST ELSEWHERE WITH 2-4 FT
SEAS.
FOR THE FORECAST, ARTHUR WILL WEAKEN TO A TROPICAL DEPRESSION NEAR 30.0N 94.2W
THIS EVENING, BECOME A REMNANT LOW AND MOVE TO 31.9N 91.6W THU MORNING,
AND DISSIPATE THU EVENING. SWELLS GENERATED BY ARTHUR ARE LIKELY
TO CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS ALONG
THE NORTHWESTERN GULF COAST FOR THE NEXT COUPLE OF DAYS.
OTHERWISE, A TIGHTENING PRESSURE GRADIENT WILL DEVELOP OVER THE
BASIN AND SUSTAIN FRESH TO STRONG SOUTHERLY WINDS OVER THE WESTERN
AND CENTRAL GULF LATE TODAY THROUGH THU NIGHT, AND MODERATE TO
FRESH WINDS OVER THE EASTERN GULF. WINDS AND SEAS WILL BEGIN TO
DIMINISH LATE FRI THROUGH THE WEEKEND AS WEAK HIGH PRESSURE
SETTLES OVER THE EASTERN GULF.
..CARIBBEAN SEA
THE BROAD SUBTROPICAL RIDGE OVER THE WESTERN ATLANTIC IS
MAINTAINING FRESH TO STRONG EASTERLY TRADE WINDS AND MODERATE TO
ROUGH SEAS IN THE CENTRAL CARIBBEAN. FRESH SE WINDS AND 5-6 FT
SEAS ARE NOTED OVER THE GULF OF HONDURAS. MODERATE E TO SE WINDS
AND 4-5 FT SEAS ARE NOTED ELSEWHERE. TRADE WIND CONVERGENCE IS
SUPPORTING SCATTERED SHOWERS AND THUNDERSTORMS OVER THE FAR
SOUTHWEST CARIBBEAN, OFF PANAMA, COSTA RICA, AND SOUTHEAST
NICARAGUA.
FOR THE FORECAST, THE WESTERN ATLANTIC RIDGE WILL REMAIN IN PLACE NORTH
OF THE AREA ALONG 27N-28N THROUGH EARLY SAT BEFORE WEAKENING SAT
NIGHT THROUGH MON, AS A FRONTAL SYSTEM MOVES SLOWLY OFFSHORE OF
THE SE U.S. COAST. THE PRESSURE GRADIENT SOUTH OF THE RIDGE WILL
SUSTAIN FRESH TO STRONG TRADE WINDS AND MODERATE TO ROUGH SEAS
IN THE SOUTH-CENTRAL CARIBBEAN THROUGH THE FORECAST PERIOD, WITH
HIGHEST WINDS AND SEAS EXPECTED OFF THE COAST OF COLOMBIA. PULSING
WINDS AT FRESH TO STRONG SPEEDS AND MODERATE TO ROUGH SEAS ARE
EXPECTED IN THE GULF OF HONDURAS NIGHTLY THROUGH SAT, PULSING
BRIEFLY TO NEAR GALE-FORCE TONIGHT AND THU NIGHT. MODERATE TO
FRESH E TO SE WINDS ARE EXPECTED ELSEWHERE ACROSS THE NORTHWESTERN
CARIBBEAN THROUGH SUN. ACTIVE SHOWERS AND THUNDERSTORMS ARE
EXPECTED ACROSS SW PORTIONS WED THROUGH FRI AS AN UPPER-LEVEL
TROUGH DIGS INTO THE AREA.
..ATLANTIC OCEAN
THE BERMUDA-AZORES SUBTROPICAL RIDGE IS THE DOMINANT FEATURE OF
INTEREST ACROSS THE TROPICAL ATLANTIC, AND IS INTERRUPTED ONLY BY
A FRONTAL TROUGH EXTENDING INTO THE REGION FROM THE WESTERN AZORES
TO 22N48W. THIS PATTERN IS SUPPORTING MODERATE SOUTHERN FLOW AND
4-5 FT SEAS OVER WEST OF 70W, GENTLE BREEZES AND 3-4 FT SEAS NORTH
OF 22N ALONG THE RIDGE AXIS, AND MODERATE TO FRESH TRADE WINDS AND
5-6 FT SEAS SOUTH OF 22N.
FOR THE FORECAST WEST OF 55W, THE ATLANTIC SUBTROPICAL RIDGE WILL DOMINATE
THE FORECAST AREA THROUGH FRI, THEN BEGIN TO WEAKEN FRI NIGHT
THROUGH THE WEEKEND AS A WEAK COLD FRONT MOVES SLOWLY OFFSHORE OF
THE SE U.S COAST. THE RELATED PRESSURE GRADIENT WILL MAINTAIN
MODERATE TO LOCALLY FRESH TRADE WINDS SOUTH OF 22N THROUGH FRI,
DIMINISHING SLIGHTLY FRI NIGHT THROUGH SAT. MODERATE TO LOCALLY
FRESH SW WINDS OFFSHORE OF NORTHEAST FLORIDA TO NEAR 72W WILL
EXPAND EASTWARD TO NEAR 65W THROUGH TONIGHT, AS A WEAK FRONTAL
SYSTEM MOVES ACROSS THE SOUTHEASTERN U.S. THE FRONT IS EXPECTED TO
MOVE SLOWLY OFFSHORE EARLY SAT AND STALL OFFSHORE NORTHEAST
FLORIDA BY SUN. EXPECT FRESH TO STRONG WINDS EACH AFTERNOON
THROUGH LATE EVENING ACROSS ATLANTIC WATERS NEAR PUERTO RICO AND
HISPANIOLA.
CHRISTENSEN
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