Mazatlan to Banderas Bay Forecast
August 26, 2026, 8:01 am (UTC: -05:00)
Subject: Mazatlan to Banderas Bay Forecast
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This forecast has not been reviewed. It was generated from an automatic model.
.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM ISELLE NEAR 21.8N 123.5W 996 MB AT 0900 UTC AUG
26 MOVING WNW OR 295 DEG AT 8 KT. MAXIMUM SUSTAINED WINDS 45 KT
GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 200 NM NE
QUADRANT...170 NM SE QUADRANT...60 NM SW QUADRANT...AND 120 NM
NW QUADRANT. SEAS 4 M OR GREATER WITHIN 180 NM OF CENTER EXCEPT
120 NM SW QUADRANT WITH SEAS TO 7.0 M. ELSEWHERE WITHIN 30N119W
TO 27N128W TO 21N131W TO 17N125W TO 18N118W TO 22N116W TO 30N119W
WINDS 20 TO 33 KT. SEAS 2.5 TO 4.5 M. REMAINDER OF AREA WITHIN
24N120W TO 25N125W TO 23N126W TO 20N125W TO 20N121W TO 20N119W TO
24N120W WINDS 20 KT OR LESS. SEAS 2.5 TO 5.5 M IN MIXED SWELL.
.24 HOUR FORECAST POST-TROPICAL ISELLE NEAR 22.8N 126.4W. MAXIMUM
SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE WINDS
WITHIN 70 NM NE QUADRANT...60 NM SE QUADRANT...0 NM SW
QUADRANT...AND 50 NM NW QUADRANT. SEAS 4 M OR GREATER
WITHIN 105 NM NW SEMICIRCLE AND 60 NM SE QUADRANT WITH SEAS TO
4.5 M. ELSEWHERE WITHIN 24N125W TO 25N126W TO 24N130W TO 22N129W
TO 24N127W TO 22N125W TO 24N125W WINDS 20 TO 33 KT. SEAS 2.5 TO
4.5 M. REMAINDER OF AREA WITHIN 26N123W TO 30N129W TO 23N134W TO
19N131W TO 19N128W TO 23N122W TO 26N123W WINDS 20 KT OR LESS.
SEAS 2.5 TO 4.5 M IN MIXED SWELL.
.36 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 23.5N
128.3W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 23.8N
130.2W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. ELSEWHERE
WITHIN 26N128W TO 29N130W TO 26N134W TO 24N134W TO 22N132W TO
24N129W TO 26N128W NE WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M.
TROPICAL STORM ISELLE IS NEAR 21.8N 123.5W AT 2 AM PDT, AND IS
MOVING WEST-NORTHWEST AT 8 KT. MAXIMUM SUSTAINED WINDS ARE 45 KT
WITH GUSTS TO 55 KT, AND THE MINIMUM CENTRAL PRESSURE IS 996 MB.
THE PROXIMITY OF ISELLE CONTINUES TO DISRUPT THE RIDGE TO ITS
NORTHWEST, AND INTO THE BAJA CALIFORNIA PENINSULA OFFSHORE
WATERS. THE GRADIENT OF THE PRESSURE BETWEEN THE RIDGE ASSOCIATED
WITH A 1022 MB HIGH NEAR 35N130W AND LOW PRESSURE OVER ARIZONA IS
SUPPORTING GENTLE TO MODERATE NW WINDS ACROSS THE BAJA CALIFORNIA
OFFSHORE WATERS N OF CABO SAN LAZARO AS A SCATTEROMETER PASS
INDICATED. SEAS ARE 4 TO 8 FT IN S-SW SWELL ACROSS THE BAJA
CALIFORNIA OFFSHORE WATERS AND 4 TO 5 FT ACROSS THE SW MEXICAN
OFFSHORES WHERE WINDS ARE LIGHT TO GENTLE. IN THE GULF OF
CALIFORNIA, LIGHT WINDS MAINTAIN SLIGHT SEAS. OTHERWISE, FRESH
TO STRONG N TO NE GAP WINDS PERSIST ACROSS THE GULF OF
TEHUANTEPEC AND DOWNWIND TO ABOUT 14N WITH 5 TO 8 FT SEAS.
TROPICAL STORM ISELLE IS CENTERED NEAR 21.8N 123.5W AT 26/0900
UTC, MOVING WEST-NORTHWEST AT 8 KT. ESTIMATED MINIMUM CENTRAL
PRESSURE IS 996 MB. MAXIMUM SUSTAINED WIND SPEED IS 45 KT WITH
GUSTS TO 55 KT. PEAK SEAS ARE ESTIMATED NEAR 20 FT. CONVECTION
FROM ISELLE IS SHEARED TO THE NE QUADRANT AND EXTENDS FROM 21N TO
27N BETWEEN 118W AND 123W. ISELLE IS MOVING TOWARD THE WEST-
NORTHWEST NEAR 9 KT, AND THIS GENERAL MOTION IS EXPECTED TO
CONTINUE OVER THE NEXT FEW DAYS. STEADY WEAKENING IS EXPECTED,
AND ISELLE IS FORECAST TO BECOME A POST-TROPICAL REMNANT LOW BY
EARLY THURSDAY. SWELLS GENERATED BY ISELLE WILL CONTINUE TO
AFFECT THE WEST COAST OF THE BAJA CALIFORNIA PENINSULA FOR A
COUPLE MORE DAYS. THESE SWELLS ARE LIKELY TO CAUSE LIFE-
THREATENING SURF AND RIP CURRENT CONDITIONS. PLEASE CONSULT
PRODUCTS FROM YOUR LOCAL WEATHER OFFICE.
INVEST AREA EP93, IS LOCATED WELL TO THE SOUTH OF SOUTHWESTERN
MEXICO NEAR 09N107W, AND IS PRODUCING A LARGE AREA OF HEAVY
SHOWERS AND THUNDERSTORMS. SCATTERED MODERATE TO STRONG
CONVECTION IS ONGOING FROM 03N TO 16N BETWEEN 89W AND 116W.
ENVIRONMENTAL CONDITIONS ARE EXPECTED TO SUPPORT GRADUAL
DEVELOPMENT OF THIS SYSTEM, AND A TROPICAL DEPRESSION IS LIKELY
TO FORM DURING THE NEXT COUPLE OF DAYS WHILE IT MOVES WEST-
NORTHWESTWARD AT 10 TO 15 KT, WELL OFFSHORE OF MEXICO. THERE IS
A HIGH CHANCE OF TROPICAL CYCLONE DEVELOPMENT WITHIN THE NEXT 2
AND 7 DAYS.
FOR THE FORECAST, ISELLE WILL MOVE TO 22.2N 124.6W THIS
AFTERNOON, BECOME POST-TROPICAL AND MOVE TO 22.8N 126.4W THU
MORNING, WEAKEN TO A REMNANT LOW NEAR 23.5N 128.3W THU AFTERNOON,
23.8N 130.2W FRI MORNING, 24.3N 132.1W FRI AFTERNOON, AND
DISSIPATE SAT MORNING. ROUGH SEAS TO 9 FT FROM ISELLE AFFECTING
THE OUTER BAJA CALIFORNIA NORTE OFFSHORE WATERS WILL SUBSIDE
LATER TODAY AS ISELLE CONTINUES TO MOVE NW AWAY OF THE AREA.
ELSEWHERE, FRESH NORTHERLY GAP WINDS WILL CONTINUE TO PULSE TO
STRONG SPEEDS ACROSS TEHUANTEPEC REGION DURING THE OVERNIGHT AND
EARLY MORNING HOURS THROUGH THE WEEKEND, WITH SEAS OCCASIONALLY
BUILDING TO 8 FT. LOOKING AHEAD, INVEST EP93 HAS THE POTENTIAL
TO DEVELOP INTO A TROPICAL DEPRESSION DURING THE NEXT COUPLE OF
DAYS WHILE IT MOVES GENERALLY WNW AT 10 TO 15 KT, WELL OFFSHORE
OF MEXICO. THIS SYSTEM WILL LIKELY FOLLOW A SIMILAR TRAJECTORY AS
ISELLE, FRI THROUGH THE WEEKEND, AND IMPACT THE OUTER OFFSHORE
WATERS NEAR THE REVILLAGIGEDO ISLANDS WITH STRONG WINDS AND ROUGH
TO VERY ROUGH SEAS.
SHORT-TERM MAZATLAN TO BAHIA BANDERAS
DATA NOTE - Using cached forecast from 6 hours ago.
TODAY - ENE 12-15, Seas SW 0-3.2 ft @ 16sec
TONITE - S 6-8, Seas SSW 0-3 ft @ 19sec
THURSDAY - NW 8-10, Seas SSW 0-3.4 ft @ 18sec
THURSDAY NIGHT - W 3-4, Seas SSW 0-3.4 ft @ 17sec
LONG-TERM MAZATLAN TO BAHIA BANDERAS
FRIDAY - W 6-7, Seas SSW 1.2-4.1 ft @ 18sec
SATURDAY - W 10-12, Seas SSW 0-5.5 ft @ 15sec
SUNDAY - WNW 10-12, Seas SSW 0-4.4 ft @ 14sec
MONDAY - NW 6-7, Seas SSW 0-4.1 ft @ 14sec
TUESDAY - SSW 9-11, Seas SW 0.8-3.4 ft @ 12sec