Weather Summary for Mexico and Central America
August 13, 2026, 11:54 am (UTC: -05:00)
Subject: Weather Summary for Mexico and Central America
**OUTSIDE BAJA FORECAST**
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This forecast has not been reviewed. It was generated from an automatic model.
.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM HERNAN NEAR 18.0N 131.9W 1004 MB AT 1500 UTC AUG
13 MOVING WSW OR 245 DEG AT 3 KT. MAXIMUM SUSTAINED WINDS 40 KT
GUSTS 50 KT. TROPICAL STORM FORCE WINDS WITHIN 60 NM NE
QUADRANT...0 NM SE QUADRANT...50 NM SW QUADRANT...AND 80 NM NW
QUADRANT. SEAS 4 M OR GREATER WITHIN 0 NM E SEMICIRCLE AND 60
NM W SEMICIRCLE WITH SEAS TO 4 M. ELSEWHERE WITHIN 19N130W TO
22N132W TO 21N134W TO 18N135W TO 15N133W TO 16N131W TO 19N130W
WINDS 20 TO 33 KT. SEAS 2.5 TO 4.0 M.
.24 HOUR FORECAST TROPICAL STORM HERNAN NEAR 17.1N 132.1W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE
WINDS WITHIN 30 NM NE AND SW QUADRANTS...40 NM NW QUADRANT AND 0
NM SE QUADRANT. SEAS 4 M OR GREATER WITHIN 45 NM OF
CENTER...EXCEPT 0 NM SE QUADRANT WITH SEAS TO 4.0 M. ELSEWHERE
WITHIN 18N133W TO 17N134W TO 17N133W TO 17N132W TO 18N133W WINDS
20 TO 33 KT. SEAS 3.0 TO 4.0 M. REMAINDER AREA WITHIN 21N132W TO
20N137W TO 18N136W TO 16N133W TO 19N133W TO 19N131W TO 21N132W
WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN MIXED SWELL.
.36 HOUR FORECAST POST-TROPICAL REMNANT LOW HERNAN NEAR 16.5N
132.7W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW HERNAN NEAR 15.9N
133.9W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. WITHIN 22N132W
TO 19N137W TO 17N137W TO 15N135W TO 16N133W TO 18N132W TO
22N132W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.0 M.
SHORT-TERM ENSENADA - CEDROS
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - NW 9-11, Seas SW 2.4-4.4 ft @ 15sec
TONITE - NW 9-11, Seas SSW 1.9-4.7 ft @ 19sec
FRIDAY - NW 10-13, Seas SSW 2-5 ft @ 17sec
FRIDAY NIGHT - NNW 10-13, Seas SSW 3.3-5.2 ft @ 17sec
SHORT-TERM CEDROS - SAN LAZAROS
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - NW 10-12, Seas SSW 2.7-5 ft @ 19sec
TONITE - NW 10-12, Seas SSW 2.7-5.1 ft @ 19sec
FRIDAY - NW 11-14, Seas SSW 3.4-5.6 ft @ 17sec
FRIDAY NIGHT - NW 12-15, Seas SSW 3.5-5.8 ft @ 16sec
SHORT-TERM SAN LAZAROS - CABO FALSO
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - NW 14-17, Seas SW 2.8-4.6 ft @ 15sec
TONITE - NW 13-16, Seas SSW 2.3-4.7 ft @ 19sec
FRIDAY - NW 14-18, Seas SSW 2.9-5.2 ft @ 18sec
FRIDAY NIGHT - NW 13-16, Seas SSW 2.5-5.1 ft @ 16sec
LONG-TERM OUTSIDE OF THE BAJA
SATURDAY - Northern 1/3 NW 13-16, Seas SSW 3.5-5.1 ft @ 16sec, Middle 2/3 NW 13-16, Seas SSW 3.6-5.5 ft @ 15sec, Southern 1/3 NW 13-16, Seas SSW 2.5-5.1 ft @ 16sec
SUNDAY - Northern 1/3 NNW 14-17, Seas SSW 3.8-5.1 ft @ 14sec, Middle 2/3 NW 13-16, Seas SSW 4.6-5.9 ft @ 14sec, Southern 1/3 NW 12-15, Seas SSW 2.5-4.7 ft @ 15sec
MONDAY - Northern 1/3 NNW 14-18, Seas SSW 4.5-5.6 ft @ 14sec, Middle 2/3 NNW 12-15, Seas SSW 4.2-5.7 ft @ 14sec, Southern 1/3 NW 10-13, Seas SSW 0-4.5 ft @ 14sec
TUESDAY - Northern 1/3 NNW 14-17, Seas SSW 4.9-5.8 ft @ 14sec, Middle 2/3 NW 9-11, Seas SSW 3.7-5.3 ft @ 15sec, Southern 1/3 WNW 9-11, Seas SSW 0-4.4 ft @ 15sec
WEDNESDAY - Northern 1/3 NNW 9-11, Seas SSW 3.3-4.4 ft @ 14sec, Middle 2/3 NNW 6-8, Seas SSW 2.6-4.1 ft @ 15sec, Southern 1/3 W 10-12, Seas SSW 1.9-3.8 ft @ 15sec
**SEA OF CORTEZ FORECAST**
FRESH TO LOCALLY STRONG WINDS PREVAIL OVER THE GULF OF
TEHUANTEPEC. FRESH SW GAP WINDS ARE IMPACTING THE NORTHERN GULF
OF CALIFORNIA. GENTLE TO MODERATE WINDS ARE FOUND ELSEWHERE.
MODERATE SEAS ARE OVER THE OPEN WATERS OFF MEXICO, WITH SLIGHT TO
MODERATE SEAS OVER THE GULF OF CALIFORNIA.
SHORT-TERM SEA OF CORTEZ NORTHERN HALF (north of 27N)
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - W 10-13, Seas SW 2.1-3.5 ft @ 15sec
TONITE - N 8-10, Seas SSW 0-3.8 ft @ 19sec
FRIDAY - W 12-15, Seas SW 2.2-4 ft @ 17sec
FRIDAY NIGHT - NNW 12-15, Seas SW 0-4.1 ft @ 16sec
SHORT-TERM SEA OF CORTEZ SOUTHERN HALF (south of 27N)
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - NE 4-5, Seas SSW 0-3.5 ft @ 15sec
TONITE - WNW 4-5, Seas SSW 0-4 ft @ 19sec
FRIDAY - WNW 4-5, Seas SSW 0-4 ft @ 19sec
FRIDAY NIGHT - W 6-7, Seas SSW 0-4.4 ft @ 17sec
LONG-TERM SEA OF CORTEZ
SATURDAY - Northern Half N 13-16, Seas SW 0-3.9 ft @ 16sec, Southern Half W 6-7, Seas SSW 0-4.4 ft @ 17sec
SUNDAY - Northern Half NNW 16-20, Seas SW 0-3.7 ft @ 15sec, Southern Half WNW 6-7, Seas SSW 0-3.8 ft @ 14sec
MONDAY - Northern Half N 15-19, Seas SW 0-4 ft @ 14sec, Southern Half SSW 6-8, Seas SSW 0-3.8 ft @ 14sec
TUESDAY - Northern Half N 10-12, Seas SSW 0-3.6 ft @ 15sec, Southern Half SW 6-8, Seas SSW 0-3.8 ft @ 15sec
WEDNESDAY - Northern Half SW 7-9, Seas SSW 0-2.6 ft @ 15sec, Southern Half WSW 9-11, Seas SSW 0-3.4 ft @ 14sec
**SEA OF CORTEZ SOUTHERN CROSSING FORECAST**
SHORT-TERM SOUTHERN CROSSING (along 23N)
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - NE 4-5, Seas SSW 0-3.5 ft @ 15sec
TONITE - WNW 4-5, Seas SSW 0-4 ft @ 19sec
FRIDAY - WNW 4-5, Seas SSW 0-4 ft @ 19sec
FRIDAY NIGHT - W 6-7, Seas SSW 0-4.4 ft @ 17sec
LONG-TERM SOUTHERN CROSSING
SATURDAY - W 6-7, Seas SSW 0-4.4 ft @ 17sec
SUNDAY - WNW 6-7, Seas SSW 0-3.8 ft @ 14sec
MONDAY - SSW 6-8, Seas SSW 0-3.8 ft @ 14sec
TUESDAY - SW 6-8, Seas SSW 0-3.8 ft @ 15sec
WEDNESDAY - WSW 9-11, Seas SSW 0-3.4 ft @ 14sec
**MAZATLAN TO BANDERAS BAY FORECAST**
SHORT-TERM MAZATLAN TO BAHIA BANDERAS
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - WNW 7-9, Seas SW 0-3.3 ft @ 15sec
TONITE - NW 3-4, Seas SSW 0-3.5 ft @ 19sec
FRIDAY - WNW 6-8, Seas SSW 0-3.9 ft @ 17sec
FRIDAY NIGHT - N 6-8, Seas SSW 0-4 ft @ 16sec
LONG-TERM MAZATLAN TO BAHIA BANDERAS
SATURDAY - WNW 7-9, Seas SSW 0-3.8 ft @ 16sec
SUNDAY - NW 7-9, Seas SSW 0-3.4 ft @ 14sec
MONDAY - WSW 8-10, Seas SSW 0-3.4 ft @ 14sec
TUESDAY - WNW 8-10, Seas SSW 0.7-2.7 ft @ 16sec
WEDNESDAY - WNW 8-10, Seas SSW 0.4-2.7 ft @ 15sec
**CABO CORRIENTES FORECAST**
SHORT-TERM CABO CORRIENTES TO MANZANILLO
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - N 7-9, Seas SW 0-3.7 ft @ 15sec
TONITE - N 6-8, Seas SSW 0-4.5 ft @ 18sec
FRIDAY - NW 7-9, Seas SSW 0-4.9 ft @ 17sec
FRIDAY NIGHT - NNE 6-8, Seas SSW 0-4.9 ft @ 16sec
LONG-TERM CABO CORRIENTES TO MANZANILLO
SATURDAY - NNE 6-8, Seas SSW 0-4.9 ft @ 16sec
SUNDAY - NW 7-9, Seas SSW 0-4.2 ft @ 14sec
MONDAY - SSW 15-19, Seas SSW 0-4.2 ft @ 14sec
TUESDAY - WNW 8-10, Seas SSW 0-3.7 ft @ 16sec
WEDNESDAY - NW 8-10, Seas SSW 0-3.5 ft @ 15sec
**MEXICAN RIVIERA FORECAST**
SHORT-TERM MEXICAN RIVIERA MANZANILLO TO BAHIAS DE HUATULCO
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - W 9-11, Seas SW 0-4.5 ft @ 16sec
TONITE - WNW 4-5, Seas SW 0-5 ft @ 19sec
FRIDAY - SW 6-8, Seas SW 0-5.7 ft @ 17sec
FRIDAY NIGHT - NW 6-7, Seas SW 0-5.7 ft @ 16sec
LONG-TERM MEXICAN RIVIERA MANZANILLO TO BAHIAS DE HUATULCO
SATURDAY - E 13-16, Seas SW 0-5.6 ft @ 16sec
SUNDAY - WNW 10-12, Seas SW 0-4.9 ft @ 14sec
MONDAY - W 11-14, Seas SW 0-4.8 ft @ 14sec
TUESDAY - W 7-9, Seas SSW 0-4.1 ft @ 16sec
WEDNESDAY - W 7-9, Seas SSW 1.2-4.3 ft @ 15sec
**TEHUANTEPEC FORECAST**
.42 HOUR FORECAST WITHIN 16N94W TO 16N95W TO 16N96W TO 14N96W TO
14N95W TO 15N94W TO 16N94W...INCLUDING THE GULF OF
TEHUANTEPEC... N WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST WITHIN 16N94W TO 16N95W TO 13N96W TO 13N95W TO
15N94W TO 16N94W...INCLUDING THE GULF OF TEHUANTEPEC... N WINDS
20 TO 25 KT. SEAS LESS THAN 2.5 M.
FRESH TO LOCALLY STRONG WINDS PREVAIL OVER THE GULF OF
TEHUANTEPEC. FRESH SW GAP WINDS ARE IMPACTING THE NORTHERN GULF
OF CALIFORNIA. GENTLE TO MODERATE WINDS ARE FOUND ELSEWHERE.
MODERATE SEAS ARE OVER THE OPEN WATERS OFF MEXICO, WITH SLIGHT TO
MODERATE SEAS OVER THE GULF OF CALIFORNIA.
FOR THE FORECAST, PULSES OF FRESH TO STRONG GAP WINDS ACROSS THE
GULF OF TEHUANTEPEC WILL DIMINISH THROUGH TONIGHT, THEN RETURN
FRI THROUGH MON. A MODERATE PRESSURE GRADIENT WILL PROMOTE MOSTLY
GENTLE TO MODERATE WINDS ACROSS THE REMAINDER OFFSHORE WATERS OF
MEXICO ALONG WITH MODERATE SEAS.
SHORT-TERM TEHUANTEPEC
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - N 8-10, Seas SW 0-4.1 ft @ 15sec
TONITE - N 10-12, Seas SW 0-4.8 ft @ 19sec
FRIDAY - N 10-12, Seas SW 0-4.8 ft @ 19sec
FRIDAY NIGHT - NE 4-5, Seas SW 0-5.7 ft @ 17sec
LONG-TERM TEHUANTEPEC
SATURDAY - NNW 21-26, Seas SW 2.7-6.1 ft @ 16sec
SUNDAY - N 20-25, Seas SW 0-5.2 ft @ 14sec
MONDAY - NNW 21-26, Seas SW 0-4.9 ft @ 14sec
TUESDAY - NNE 10-12, Seas SW 0-5.2 ft @ 15sec
WEDNESDAY - SE 9-11, Seas SW 0-5.5 ft @ 16sec
**GAP WINDS FORECAST**
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N84W TO 08N92W TO 08N101W. ITCZ FROM
08N101W TO 10N121W. SCATTERED MODERATE ISOLATED STRONG FROM 04N
TO 10N BETWEEN 85W AND 101W...AND FROM 03N TO 13N BETWEEN 102W
AND 134W.
THE AXIS OF A TROPICAL WAVE IS NEAR 94W NORTH OF 02N, MOVING
WEST AT 10 TO 15 KT. NEARBY CONVECTION IS DISCUSSED IN THE
ITCZ/MONSOON TROUGH SECTION BELOW.
THE AXIS OF A TROPICAL WAVE IS NEAR 125W FROM 02N TO 18N, MOVING
WESTWARD AT 10 TO 15 KT. NEARBY CONVECTION IS DISCUSSED IN THE
ITCZ/MONSOON TROUGH SECTION BELOW.
THE MONSOON TROUGH EXTENDS FROM 09N84W TO 08N92W TO 08N101W. THE
ITCZ EXTENDS FROM 08N101W TO 10N121W. SCATTERED MODERATE TO
ISOLATED STRONG CONVECTION IS FROM 04N TO 10N BETWEEN 85W AND
101W, AND FROM 03N TO 13N BETWEEN 102W AND 134W.
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
FRESH TO LOCALLY STRONG WINDS PREVAIL OVER THE GULF OF
TEHUANTEPEC. FRESH SW GAP WINDS ARE IMPACTING THE NORTHERN GULF
OF CALIFORNIA. GENTLE TO MODERATE WINDS ARE FOUND ELSEWHERE.
MODERATE SEAS ARE OVER THE OPEN WATERS OFF MEXICO, WITH SLIGHT TO
MODERATE SEAS OVER THE GULF OF CALIFORNIA.
FOR THE FORECAST, PULSES OF FRESH TO STRONG GAP WINDS ACROSS THE
GULF OF TEHUANTEPEC WILL DIMINISH THROUGH TONIGHT, THEN RETURN
FRI THROUGH MON. A MODERATE PRESSURE GRADIENT WILL PROMOTE MOSTLY
GENTLE TO MODERATE WINDS ACROSS THE REMAINDER OFFSHORE WATERS OF
MEXICO ALONG WITH MODERATE SEAS.
FRESH TO STRONG E GAP WINDS AND MODERATE SEAS PERSIST ACROSS AND
DOWNSTREAM THE GULF OF PAPAGAYO. GENTLE TO MODERATE WINDS AND
MODERATE SEAS IN SW SWELL PREVAIL ELSEWHERE.
FOR THE FORECAST, MODERATE TO FRESH NE TO E GAP WINDS AND
OCCASIONALLY ROUGH SEAS WILL PULSE ACROSS THE PAPAGAYO REGION.
GENTLE TO MODERATE WINDS WILL PREVAIL BETWEEN THE GALAPAGOS
ISLANDS AND ECUADOR, WITH LARGE SOUTHERLY SWELL MOVING INTO THE
REGION STARTING THU NIGHT. LIGHT TO GENTLE WINDS AND MODERATE
SEAS IN SW SWELL ARE EXPECTED ELSEWHERE.
.WITHIN 11N86W TO 12N87W TO 12N89W TO 10N90W TO 09N89W TO 10N86W
TO 11N86W...INCLUDING THE GULF OF PAPAGAYO... NE TO E WINDS 20
TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST WITHIN 11N86W TO 12N87W TO 11N89W TO 10N89W TO
09N87W TO 10N86W TO 11N86W...INCLUDING THE GULF OF PAPAGAYO...
NE TO E WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST WITHIN 11N86W TO 12N86W TO 11N88W TO 10N88W TO
10N87W TO 10N86W TO 11N86W...INCLUDING THE GULF OF PAPAGAYO...
NE WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
FRESH TO STRONG E GAP WINDS AND MODERATE SEAS PERSIST ACROSS AND
DOWNSTREAM THE GULF OF PAPAGAYO. GENTLE TO MODERATE WINDS AND
MODERATE SEAS IN SW SWELL PREVAIL ELSEWHERE.
SHORT-TERM GAP WINDS (Near 11N 86W)
DATA NOTE - Extended sea states: Open-Meteo NCEP GFS-Wave.
TODAY - E 17-21, Seas SW 1.8-4.5 ft @ 20sec
TONITE - ENE 19-24, Seas SW 2.2-4.8 ft @ 19sec
FRIDAY - ENE 19-24, Seas SW 2.2-4.8 ft @ 19sec
FRIDAY NIGHT - ENE 18-22, Seas SW 3-5.4 ft @ 17sec
LONG-TERM GAP WINDS (Near 11N 86W)
SATURDAY - ENE 20-25, Seas SW 2.7-5.8 ft @ 16sec
SUNDAY - ENE 22-28, Seas SW 3.3-5.6 ft @ 15sec
MONDAY - NE 21-26, Seas SW 2.7-5.1 ft @ 14sec
TUESDAY - ENE 21-26, Seas SW 2.8-5.1 ft @ 14sec
WEDNESDAY - ENE 16-20, Seas SW 2-4.1 ft @ 15sec
** TSUNAMI INFO **
tsunami
See https://www.tsunami.gov/events/xml/PHEBAtom.xml PTCW - Tsunami warnings and info for Pacific Ocean (1.5 days old)
Updated 12 Aug 2026 03:51:02 GMT (1.5 days old)
AT LOIHI SEAMOUNT SOUTH OF THE BIG ISLAND
https://www.tsunami.gov/events/PHEB/2026/08/12/26224050/1/WEHW42/WEHW42.txt
ZCZC
WEHW42 PHEB 120351
TIBHWX
HIZ001-003-006>007-009-016>018-023-026-029>035-037>050-051>054-
120551-
TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER HONOLULU HI
551 PM HST TUE AUG 11 2026
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - LOCAL TSUNAMI INFORMATION STATEMENT
THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0549 PM HST 11 AUG 2026
COORDINATES - 18.8 NORTH 155.2 WEST
LOCATION - AT LOIHI SEAMOUNT SOUTH OF THE BIG ISLAND
MAGNITUDE - 5.1
EVALUATION
NO TSUNAMI IS EXPECTED. REPEAT. NO TSUNAMI IS EXPECTED.
HOWEVER...SOME AREAS MAY HAVE EXPERIENCED STRONG SHAKING.
THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.
$$
NNNN
See https://www.tsunami.gov/events/xml/PAAQAtom.xml NWS West Coast/Alaska Tsunami Center Bulletins (0.1 days old)
Updated 13 Aug 2026 15:34:56 GMT (0.1 days old)
70 miles SW of Sacramento, California
https://www.tsunami.gov/events/PAAQ/2026/08/13/tjpse5/1/WEAK53/WEAK53.txt
WEAK53 PAAQ 131534
TIBAK1
Tsunami Information Statement Number 1
NWS National Tsunami Warning Center Palmer AK
834 AM PDT Thu Aug 13 2026
...THIS IS A TSUNAMI INFORMATION STATEMENT...
EVALUATION
----------
* There is NO tsunami danger from this earthquake.
PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------
* The following parameters are based on a rapid preliminary
assessment of the earthquake and changes may occur.
* Magnitude 4.0
* Origin Time 0730 AKDT Aug 13 2026
0830 PDT Aug 13 2026
1530 UTC Aug 13 2026
* Coordinates 37.8 North 122.2 West
* Depth 6 miles
* Location 70 miles SW of Sacramento, California
10 miles E of San Francisco, California
ADDITIONAL INFORMATION AND NEXT UPDATE
--------------------------------------
* Further information will be issued by the United States
Geological Survey (earthquake.usgs.gov) or the appropriate
regional seismic network.
* This will be the only U.S. National Tsunami Warning Center
message issued for this event unless additional information
becomes available.
$$