Mazatlan to Banderas Bay Forecast
August 24, 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.
...HURRICANE WARNING...
.TROPICAL STORM ISELLE NEAR 17.1N 115.3W 999 MB AT 0300 UTC AUG
24 MOVING NW OR 310 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 45 KT
GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 100 NM E
SEMICIRCLE...110 NM SW QUADRANT AND 0 NM NW QUADRANT. SEAS 4 M
OR GREATER WITHIN 210 NM NE QUADRANT...150 NM SE QUADRANT...75 NM
SW QUADRANT...AND 90 NM NW QUADRANT WITH SEAS TO 5.5 M. WITHIN
21N111W TO 22N114W TO 18N119W TO 13N118W TO 13N114W TO 17N110W TO
21N111W WINDS 20 TO 33 KT. SEAS 2.5 TO 4.5 M.
.24 HOUR FORECAST TROPICAL STORM ISELLE NEAR 19.4N 117.8W.
MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE
WINDS WITHIN 110 NM NE QUADRANT...130 NM SE QUADRANT...90 NM SW
QUADRANT...AND 60 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 180 NM
E SEMICIRCLE...120 NM SW QUADRANT AND 90 NM NW QUADRANT WITH SEAS TO
6.0 M. WITHIN 21N112W TO 25N114W TO 24N118W TO 21N122W TO
18N123W TO 15N115W TO 21N112W SE WINDS 20 TO 33 KT. SEAS 2.5 TO
4.5 M. WITHIN 14N116W TO 16N116W TO 15N120W TO 14N121W TO 11N120W
TO 11N117W TO 14N116W S TO SW WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0
M.
.36 HOUR FORECAST HURRICANE ISELLE NEAR 20.4N 119.6W. MAXIMUM
SUSTAINED WINDS 65 KT GUSTS 80 KT.
.48 HOUR FORECAST TROPICAL STORM ISELLE NEAR 21.0N 121.4W.
MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE
WINDS WITHIN 120 NM NE QUADRANT...100 NM SE QUADRANT...60 NM SW
QUADRANT...AND 70 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 210
NM E SEMICIRCLE...AND 120 NM W SEMICIRCLE OF CENTER WITH SEAS TO
7.0 M. WITHIN 23N115W TO 26N117W TO 26N124W TO 21N126W TO
16N120W TO 17N116W TO 23N115W E TO SE WINDS 20 TO 33 KT. SEAS
2.5 TO 4.5 M. WITHIN 12N123W TO 11N125W TO 10N124W TO 10N123W TO
11N122W TO 12N123W SW WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M.
TROPICAL STORM ISELLE IS NEAR 17.1N 115.3W AT 8 PM PDT, AND IS
MOVING NORTHWEST AT 10 KT. MAXIMUM SUSTAINED WINDS ARE 45 KT WITH
GUSTS TO 55 KT, AND THE MINIMUM CENTRAL PRESSURE IS 999 MB. A
RIDGE CONTINUES TO DOMINATE THE OFFSHORE FORECAST WATERS OF BAJA
CALIFORNIA NORTE SUPPORTING GENTLE TO MODERATE NW WINDS AND
MODERATE SEAS. STRONG WINDS AND ROUGH SEAS ASSOCIATED WITH THE
OUTER PERIPHERY OF T.S. ISELLE ARE AFFECTING THE REVILLAGIGEDO
ISLANDS, PARTICULARLY CLARION ISLAND. MODERATE TO FRESH SE TO S
WINDS ARE IN THE GULF OF CALIFORNIA N OF 25N WITH SLIGHT SEAS.
FRESH TO STRONG N GAP WINDS PERSIST ACROSS THE GULF OF
TEHUANTEPEC AND DOWNWIND TO ABOUT 14.5N. SEAS ARE 6 TO 8 FT WITH
THESE WINDS.
TROPICAL STORM ISELLE IS CENTERED NEAR 17.1N 115.3W AT 24/0300
UTC, MOVING NORTHWEST AT 10 KT. ESTIMATED MINIMUM CENTRAL
PRESSURE IS 999 MB. MAXIMUM SUSTAINED WIND SPEED IS 45 KT WITH
GUSTS TO 55 KT. PEAK SEAS ARE 17 FT. NUMEROUS MODERATE TO STRONG
CONVECTION IS NOTED FROM 11N TO 20N BETWEEN 112W AND 120W.
ISELLE IS MOVING TOWARD THE NORTHWEST NEAR 12 KT AND THIS MOTION
IS EXPECTED TO CONTINUE THROUGH MONDAY, FOLLOWED BY A GRADUAL
TURN TOWARD THE WEST-NORTHWEST ON TUESDAY. SOME STRENGTHENING IS
FORECAST DURING THE NEXT DAY OR TWO, AND ISELLE COULD BECOME A
STRONG TROPICAL STORM MONDAY NIGHT OR EARLY TUESDAY. SWELLS
GENERATED BY ISELLE WILL AFFECT THE WEST COAST OF THE BAJA
CALIFORNIA PENINSULA BEGINNING MONDAY. THESE SWELLS ARE LIKELY TO
CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS. PLEASE
CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE.
CENTRAL EAST PACIFIC (EP91): DISORGANIZED SHOWERS AND
THUNDERSTORMS ARE PERSISTING WITH A BROAD AREA OF LOW PRESSURE
LOCATED WELL TO THE SOUTH-SOUTHWEST OF THE SOUTHERN TIP OF THE
BAJA CALIFORNIA PENINSULA. ENVIRONMENTAL CONDITIONS COULD SUPPORT
THE DEVELOPMENT OF A SHORT-LIVED TROPICAL DEPRESSION DURING THE
NEXT DAY OR SO BEFORE IT BECOMES ABSORBED BY TROPICAL STORM
ISELLE.THIS SYSTEM HAS A MEDIUM CHANCE FOR TROPICAL CYCLONE
FORMATION THROUGH 48 HRS, AND ALSO THROUGH 7 DAYS.
FOR THE FORECAST, ISELLE WILL MOVE TO 18.1N 116.4W MON MORNING,
19.4N 117.8W MON EVENING, STRENGTHEN TO A HURRICANE NEAR 20.4N
119.6W TUE MORNING, WEAKEN TO A TROPICAL STORM NEAR 21.0N 121.4W
TUE EVENING, 21.5N 123.1W WED MORNING, AND 21.9N 125.1W WED
EVENING. ISELLE WILL CHANGE LITTLE IN INTENSITY AS IT MOVES NEAR
22.8N 128.8W LATE THU. A RIDGE WILL PERSIST BETWEEN BAJA
CALIFORNIA AND ISELLE THROUGH ABOUT MIDWEEK SUPPORTING GENTLE TO
MODERATE NW TO N WINDS NORTH OF CABO SAN LAZARO. STRONGER WINDS
AND HIGHER SEAS ARE EXPECTED ACROSS THE FORECAST ZONE BETWEEN
CABO SAN LAZARO AND CABO SAN LUCAS, INCLUDING THE REVILLAGIGEDO
ISLANDS, DUE TO THE PROXIMITY OF ISELLE. THE FORECAST CALLS FOR
STORM CONDITIONS IN THE REVILLAGIGEDO ISLANDS TONIGHT, AND STORM
CONDITIONS POSSIBLE IN THE REVILLAGIGEDO ISLANDS AND THE FORECAST
ZONE BETWEEN CABO SAN LAZARO AND CABO SAN LUCAS ON MON. FRESH
NORTHERLY GAP WINDS WILL CONTINUE TO PULSE TO STRONG SPEEDS
ACROSS TEHUANTEPEC REGION MAINLY DURING THE OVERNIGHT AND EARLY
MORNING HOURS THROUGH THE NEXT SEVERAL DAYS, WITH SEAS
OCCASIONALLY BUILDING TO 8 FT.
HIGH PRESSURE OF 1022 MB LOCATED N OF THE AREA EXTENDS A RIDGE
SOUTHEASTWARD INTO THE NORTHERN FORECAST WATERS TO OFFSHORE OF
BAJA CALIFORNIA NORTE. UNDER THE INFLUENCE OF THIS SYSTEM, AND
OUTSIDE OF ISELLE, MODERATE TO LOCALLY FRESH N TO NE WINDS ARE
OBSERVED N OF 15N AND W OF 120W. FRESH NE TO E WINDS ARE SEEN
FROM 10N TO 15N W OF 125W. MODERATE OR WEAKER WINDS AND MODERATE
SEAS IN MIXED SWELL PREVAIL ELSEWHERE.
FOR THE FORECAST, AN AREA OF LOW PRESSURE IS EXPECTED TO DEVELOP
WELL SOUTH OF THE SOUTHERN TIP OF THE BAJA CALIFORNIA PENINSULA
TOWARD THE MIDDLE PORTION OF THE WEEK. SOME SLOW DEVELOPMENT IS
EXPECTED THEREAFTER, AND A TROPICAL DEPRESSION IS LIKELY TO FORM
LATER THIS WEEK OR OVER THE WEEKEND WHILE THE SYSTEM MOVES
GENERALLY WEST-NORTHWESTWARD.
SHORT-TERM MAZATLAN TO BAHIA BANDERAS
DATA NOTE - Using cached forecast from 6 hours ago.
TODAY - NW 10-12, Seas SSW 1.1-4.1 ft @ 17sec
TONITE - N 7-9, Seas SSW 0-4.1 ft @ 18sec
TUESDAY - S 14-18, Seas SSW 0-4 ft @ 16sec
TUESDAY NIGHT - ESE 8-10, Seas SW 0-3.1 ft @ 16sec
LONG-TERM MAZATLAN TO BAHIA BANDERAS
WEDNESDAY - ESE 8-10, Seas SW 0-3.1 ft @ 16sec
THURSDAY - NNE 8-10, Seas SSW 1.2-3.2 ft @ 18sec
FRIDAY - WSW 6-7, Seas SSW 0-4.3 ft @ 18sec
SATURDAY - NW 6-8, Seas SSW 0-4.4 ft @ 17sec
SUNDAY - NNW 8-10, Seas SSW 1-4.7 ft @ 15sec