Tehuantepec Forecast

September 18, 2026, 8:00 pm (UTC: -05:00)
Subject: Tehuantepec Forecast

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This forecast has not been reviewed. It was generated from an automatic model.

WARNINGS
.NONE.

.WITHIN 16N94W TO 16N95W TO 15N97W TO 13N97W TO 14N95W TO 15N94W
TO 16N94W...INCLUDING THE GULF OF TEHUANTEPEC...N TO NE WINDS 20
TO 30 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

THE PRESSURE GRADIENT BETWEEN A RIDGE OVER THE GULF OF AMERICA
AND THE EASTERN EXTENSION OF THE PACIFIC MONSOON IS SUPPORTING
STRONG TO NEAR-GALE FORCE NORTH TO NORTHEAST GAP WINDS ACROSS
THE GULF OF TEHUANTEPEC AS WAS EVIDENT IN SATELLITE
SCATTEROMETER FROM THROUGHOUT THE DAY. SEAS WITH THESE WINDS ARE
6 TO 8 FT. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE
OVER MOST OF THE OFFSHORE WATERS, ESPECIALLY EAST OF ABOUT 101W.
THE NORTHERN PORTION OF TROPICAL WAVE EXTENDS ALONG 104W,
NORTHWARD TO NEAR 17N. THE GRADIENT RELATED TO HIGH PRESSURE WEST
OF THE BAJA CALIFORNIA OFFSHORES IS SUPPORTING MODERATE TO FRESH
NORTHWEST WINDS N OF CABO SAN LAZARO. MODERATE OR WEAKER WINDS
ARE ELSEWHERE ALONG WITH MODERATE SEAS, EXCEPT FOR SLIGHT SEAS IN
THE GULF OF CALIFORNIA.
FOR THE FORECAST, WINDS WILL PULSE TO FRESH TO STRONG SPEEDS IN
THE GULF OF TEHUANTEPEC TONIGHT BECOMING MODERATE NORTH TO
NORTHEAST WINDS SAT AFTERNOON. FRESH TO STRONG NORTHWEST WINDS
OFFSHORE BAJA CALIFORNIA WILL DIMINISH SAT AFTERNOON. NORTHWEST
WINDS OVER THESE WATERS ARE EXPECTED TO BRIEFLY REACH FRESH
SPEEDS MON NIGHT INTO TUE. OTHERWISE, THE ENVIRONMENTAL
CONDITIONS OF THE TROPICAL WAVE THAT EXTENDS FROM 6N105W TO
06N106W, WITH LOW PRESSURE OF 1010 MB, INVEST EP99, NEAR 07N106W
ARE CONDUCIVE FOR DEVELOPMENT, AND A TROPICAL DEPRESSION IS
LIKELY TO FORM LATE THIS WEEKEND OR EARLY NEXT WEEK WHILE IT
GRADUALLY MOVES NORTH-NORTHWESTWARD AND NORTHWARD OFF THE COAST
OF SOUTHWESTERN MEXICO. REGARDLESS OF DEVELOPMENT, THIS SYSTEM IS
FORECAST TO BRING FRESH TO STRONG WINDS AND MODERATE TO ROUGH
SEAS TO THE MICHOACAN AND JALISCO OFFSHORES TUE NIGHT INTO THE
MIDDLE PART OF NEXT WEEK.

SHORT-TERM TEHUANTEPEC
TODAY - NW 7-9, Seas SE 0-2.2 ft @ 7sec
TONITE - NNW 9-11, Seas SSE 1.7-2.3 ft @ 6sec
SATURDAY - W 10-12, Seas SSE 1-1.7 ft @ 7sec
SATURDAY NIGHT - W 17-21, Seas W 1.9-2.3 ft @ 3sec

LONG-TERM TEHUANTEPEC
SUNDAY - W 17-21, Seas W 1.9-2.3 ft @ 3sec
MONDAY - W 10-13, Seas S 1.4-2.1 ft @ 7sec
TUESDAY - W 9-11, Seas SSW 1.3-3.4 ft @ 7sec
WEDNESDAY - WNW 13-16, Seas WSW 3.1-8 ft @ 13sec
THURSDAY - NNW 18-22, Seas WSW 4.7-8.4 ft @ 13sec