Mazatlan to Banderas Bay Forecast
August 25, 2026, 8:01 pm (UTC: -05:00)
Subject: Mazatlan to Banderas Bay Forecast
Questions/Comments visit https://svsarana.com
This forecast has not been reviewed. It was generated from an automatic model.
.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM ISELLE NEAR 21.0N 121.8W 994 MB AT 2100 UTC AUG
25 MOVING WNW OR 285 DEG AT 8 KT. MAXIMUM SUSTAINED WINDS 50 KT
GUSTS 60 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 210 NM NE QUADRANT...200
NM SE QUADRANT...120 NM SW QUADRANT...AND 180 NM NW QUADRANT
WITH SEAS TO 8.5 M. ELSEWHERE WITHIN 24N119W TO 25N122W TO 23N125W
TO 20N124W TO 20N120W TO 19N117W TO 24N119W WINDS 20 TO 33 KT.
SEAS 3.0 TO 4.5 M. REMAINDER OF AREA WITHIN 25N115W TO 28N116W
TO 27N122W TO 24N126W TO 20N126W TO 15N117W TO 25N115W WINDS 20
KT OR LESS. SEAS 2.5 TO 3.5 M IN SE TO S SWELL.
.24 HOUR FORECAST TROPICAL STORM ISELLE NEAR 21.8N 124.7W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE
WINDS WITHIN 100 NM NE QUADRANT...60 NM SE QUADRANT...20 NM SW
QUADRANT...AND 70 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 150
NM N SEMICIRCLE...0 NM N SEMICIRCLE WITH SEAS TO 6.0 M. ELSEWHERE
WITHIN 25N123W TO 25N126W TO 24N127W TO 22N127W TO 21N124W TO
22N122W TO 25N123W WINDS 20 TO 33 KT. SEAS 3.0 TO 5.0 M.
REMAINDER OF AREA WITHIN 26N120W TO 27N125W TO 25N130W TO 20N130W
TO 19N126W TO 20N120W TO 26N120W WINDS 20 KT OR LESS. SEAS 2.5
TO 3.5 M IN E TO SE SWELL.
.36 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 22.4N
126.6W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS TO 4.5 M.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW ISELLE NEAR 23.0N
128.7W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WITHIN 24N128W
TO 26N131W TO 24N131W TO 23N131W TO 24N130W TO 23N128W TO
24N128W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE WITHIN
27N127W TO 27N129W TO 26N132W TO 22N132W TO 22N129W TO 24N126W TO
27N127W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN E TO SE SWELL.
...GALE WARNING...
.REMNANTS OF JULIO NEAR 21.0N 119.5W 1003 MB AT 2100 UTC AUG 25
MOVING N OR 350 DEG AT 22 KT. MAXIMUM SUSTAINED WINDS 40 KT
GUSTS 50 KT. GALE FORCE WINDS WITHIN 0 NM W SEMICIRCLE...80 NM
NE QUADRANT AND 60 NM SE QUADRANT. SEAS 4 M OR GREATER WITHIN 0
NM W SEMICIRCLE...90 NM NE QUADRANT AND 120 NM SE QUADRANT WITH
SEAS TO 4.5 M.
.06 HOUR FORECAST REMNANTS OF JULIO AND ASSOCIATED CONDITIONS TO
BECOME ABSORBED INTO EASTERN SEMICIRCLE OF ISELLE.
.12 HOUR FORECAST DISSIPATED JULIO NEAR 22.5N 121.0W.
TROPICAL STORM ISELLE CONTINUES TO MOVE AWAY FROM THE MEXICAN
OFFSHORE WATERS, LOCATED NEAR 21.0N 121.8W AT 2 PM PDT, MOVING
WEST- NORTHWEST AT 8 KT. MAXIMUM SUSTAINED WINDS ARE 50 KT WITH
GUSTS TO 60 KT, AND THE MINIMUM CENTRAL PRESSURE IS 994 MB. THE
REMNANTS OF FORMER TROPICAL STORM JULIO ARE RACING NORTHWARD AND
GRADUALLY MERGING INTO THE EASTEN SIDE OF ISELLE, LOCATED NEAR
21.0N 119.5W AT 2 PM PDT. WINDS TO 40 KT ARE WITHIN 80 NM ACROSS
THE EASTERN SEMICIRCLE AND GRADUALLY SHIFTING AWAY FROM THE
REVILLAGIGEDO ISLANDS THIS AFTERNOON. THE PROXIMITY OF ISELLE
CONTINUES TO DISRUPT THE RIDGE TO ITS NORTH, AND INTO THE BAJA
OFFSHORE WATERS. THIS IS MAINTAINING LIGHT TO GENTLE WINDS
ACROSS THE BAJA CALIFORNIA WATERS AND MOSTLY NE TO E WINDS
ACROSS THE SW MEXICAN OFFSHORE WATERS W OF PUERTO ANGEL. SEAS
ARE 7 TO 13 FT IN S-SW SWELL FROM ISELLE ACROSS THE BAJA SUR
WATERS, AND 5 TO 8 FT IN BUILDING S-SW SWELL ACROSS THE BAJA
NORTE WATERS. SEAS ARE 4 TO 5 FT ELSEWHERE ACROSS THE REMAINDER
OF THE MEXICAN OFFSHORE WATERS. WINDS AND SEAS ARE GRADUALLY
DIMINISHING ACROSS THE REVILLAGIGEDO ISLANDS AND AREA WATERS AS
ISELLE GRADUALLY MOVES AWAY FROM THAT AREA, AS SEAS ARE SUBSIDING
TO 7 TO 10 FT THERE. LIGHT AND VARIABLE WINDS GENERALLY DOMINATE
THE GULF OF CALIFORNIA. A LARGE CLUSTER OF STRONG THUNDERSTORMS
OVERS THE ENTRANCE TO THE GULF, SUPPORTED BY AN UPPER LEVEL LOW
PRESSURE SYSTEM, HAS SHIFTED NORTHWESTWARD INTO THE SOUTHERN GULF
AND ACROSS BAJA SUR IN RECENT HOURS, AND DIMINISHED CONSIDERABLY.
OTHERWISE, FRESH TO STRONG N TO NE GAP WINDS PERSIST ACROSS THE
GULF OF TEHUANTEPEC AND DOWNWIND TO ABOUT 14N WITH 6 TO 8 FT
SEAS.
TROPICAL STORM ISELLE IS CENTERED NEAR 21.0N 121.8W AT 2100 UTC,
MOVING WEST-NORTHWEST AT 8 KT. ESTIMATED MINIMUM CENTRAL
PRESSURE IS 994 MB. MAXIMUM SUSTAINED WIND SPEED IS 50 KT WITH
GUSTS TO 60 KT. PEAK SEAS ARE ESTIMATED NEAR 28 FT. NUMEROUS
MODERATE ISOLATED STRONG CONVECTION IS NOTED FROM 21.5N TO 24.5N
BETWEEN 119W AND 122W, WHILE SCATTERED MODERATE CONVECTION
EXTENDS ELSEWHERE FROM 20N TO 25N BETWEEN 118W AND 122W. THIS
CURRENT WEST- NORTHWEST MOTION IS EXPECTED TO CONTINUE THROUGH
WED, WHILE ISELLE GRADUALLY WEAKENS DUE TO CONTINUED WESTERLY
UPPER LEVEL WIND SHEAR AND COOLER SSTS. ISELLE IS FORECAST TO
BECOME A POST- TROPICAL REMNANT LOW BY THU. S-SW SWELL GENERATED
BY ISELLE IS AFFECTING THE OFFSHORE WATERS AND WEST COAST OF THE
BAJA CALIFORNIA PENINSULA, AND WILL CONTINUE THROUGH WED MORNING
BEFORE SUBSIDING QUICKLY. THESE SWELLS ARE LIKELY TO CAUSE LARGE
AND POWERFUL SURF AND LIFE- THREATENING RIP CURRENT CONDITIONS.
PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE.
THE REMNANTS OF TROPICAL STORM JULIO ARE CENTERED NEAR 21.0N
119.5W AT 2100 UTC, MOVING NORTH AT 22 KT. ESTIMATED MINIMUM
CENTRAL PRESSURE IS 1003 MB. MAXIMUM SUSTAINED WIND SPEED IS 40
KT WITH GUSTS TO 50 KT. PEAK SEAS ARE ESTIMATED AT 16 FT WITHIN
120 NM ACROSS THE E SEMICIRCLE. NUMEROUS MODERATE ISOLATED
STRONG CONVECTION IS NOTED IN A NARROW BAND FROM 13N TO 20.5N
BETWEEN 117.5W AND 122W, TO THE SOUTH OF THE REMNANTS OF JULIO.
THIS SYSTEM IS EXPOSED TO THE NORTH OF THE AREA OF STRONG
CONVECTION, AND NO LONGER HAS A CLOSED CYCLONIC CIRCULATION, AND
THUS IS NO LONGER A TROPICAL CYCLONE. RECENT SATELLITE
SCATTEROMETER DATA SHOWED WINDS TO 40 KT ACROSS THE EASTERN
SEMICIRCLE OF THE REMNANT LOW OF JULIO. A GALE WARNING IS NOW IN
EFFECT FOR THIS AREA OF WINDS THROUGH THIS EVENING, BEFORE THE
REMNANTS BECOME ABSORBED WITHIN THE OUTER EASTERN CIRCULATION OF
ISELLE THIS EVENING THROUGH TONIGHT.
SHORT-TERM MAZATLAN TO BAHIA BANDERAS
DATA NOTE - Using cached forecast from 6 hours ago.
TODAY - NW 5-6, Seas SW 0-3.4 ft @ 16sec
TONITE - SE 4-5, Seas SW 0-3.1 ft @ 16sec
WEDNESDAY - WNW 7-9, Seas SW 0-3 ft @ 15sec
WEDNESDAY NIGHT - N 6-7, Seas SSW 0-3 ft @ 19sec
LONG-TERM MAZATLAN TO BAHIA BANDERAS
THURSDAY - WNW 10-12, Seas SSW 1.5-3.5 ft @ 18sec
FRIDAY - W 9-11, Seas SSW 0-4.1 ft @ 18sec
SATURDAY - WNW 9-11, Seas SSW 0-5.3 ft @ 15sec
SUNDAY - W 8-10, Seas SSW 1.1-3.5 ft @ 14sec
MONDAY - S 6-8, Seas SSW 0-3 ft @ 13sec