Weather Summary for Mexico and Central America



September 21, 2017, 8:30 pm (UTC: -07:00)
Subject: Weather Summary for Mexico and Central America

**OUTSIDE BAJA FORECAST**

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WARNINGS
.NONE.
SHORT-TERM ENSENADA - CEDROS
TODAY - NW 8-11, Seas NW 6-10 feet @ 13sec
TONITE - NNW 10-14, Seas NW 6-9 feet @ 12sec
FRIDAY - NW 14-20, Seas NW 6-10 feet @ 11sec
FRIDAY NIGHT - NW 14-19, Seas NW 6-10 feet @ 10sec

SHORT-TERM CEDROS - SAN LAZAROS
TODAY - NW 7-9, Seas NW 4-7 feet @ 14sec
TONITE - WNW 9-12, Seas NW 4-7 feet @ 13sec
FRIDAY - NW 11-16, Seas WNW 4-7 feet @ 12sec
FRIDAY NIGHT - NW 14-19, Seas WNW 5-8 feet @ 11sec

SHORT-TERM SAN LAZAROS - CABO FALSO
TODAY - WNW 13-18, Seas SSE 4-7 feet @ 10sec
TONITE - WNW 13-18, Seas SSE 4-7 feet @ 9sec
FRIDAY - NW 14-19, Seas SSE 4-7 feet @ 9sec
FRIDAY NIGHT - NW 13-18, Seas SSE 4-7 feet @ 9sec

LONG-TERM OUTSIDE OF THE BAJA
SATURDAY - Northern 1/3 NW 14-20, Seas NW 6-10 feet @ 10sec, Middle 2/3 NW 15-20, Seas WNW 5-9 feet @ 10sec, Southern 1/3 NW 16-22, Seas SSE 5-8 feet @ 9sec
SUNDAY - Northern 1/3 NW 12-17, Seas NW 6-9 feet @ 10sec, Middle 2/3 NW 15-21, Seas WNW 6-10 feet @ 8sec, Southern 1/3 WNW 16-22, Seas WNW 5-9 feet @ 5sec
MONDAY - Northern 1/3 NNW 12-17, Seas WNW 5-8 feet @ 9sec, Middle 2/3 NW 11-15, Seas WNW 5-8 feet @ 10sec, Southern 1/3 NW 14-20, Seas SSW 5-9 feet @ 10sec
TUESDAY - Northern 1/3 NNW 10-14, Seas WNW 4-7 feet @ 9sec, Middle 2/3 NW 7-9, Seas WSW 4-6 feet @ 9sec, Southern 1/3 WNW 9-13, Seas S 4-7 feet @ 10sec
WEDNESDAY - Northern 1/3 NW 10-14, Seas W 4-6 feet @ 10sec, Middle 2/3 NW 7-10, Seas S 3-6 feet @ 10sec, Southern 1/3 WNW 8-11, Seas SSE 3-5 feet @ 10sec


**SEA OF CORTEZ FORECAST**

.GULF OF CALIFORNIA N OF 29.5N SW WINDS 20 TO 25 KT. SEAS LESS
THAN 8 FT.
.12 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.


A WEAK SURFACE RIDGE EXTENDS ESE ACROSS THE NORTHERN PORTIONS
OF THE DISCUSSION AREA TO THE CENTRAL PART OF BAJA CALIFORNIA
NEAR 26N. AN APPROACHING COLD FRONT MOVING SOUTH INTO THE FAR
NORTHERN WATERS EXTENDS FROM 30N119W TO 29N124W TO 30N133W. THE
PRESSURE GRADIENT BETWEEN HIGH PRESSURE BEHIND THE FRONT AND
TROUGHING ACROSS NORTHERN MEXICO IS PRODUCING FRESH TO STRONG SW
WINDS IN THE NORTHERN PART OF THE GULF OF CALIFORNIA, EXPECTED
TO PERSIST THROUGH EARLY FRI MORNING, WITH SEAS BUILDING TO 5-7
FT NORTH OF 29N. AS THE HIGH PRESSURE BEHIND THE DISSIPATING
FRONT BUILDS SE INTO THE AREA DURING THE NEXT COUPLE OF DAYS,
NWLY WINDS WILL FRESHEN SLIGHTLY WEST OF BAJA CALIFORNIA NORTE,
WHILE LITTLE EFFECTS WILL BE SEEN SOUTH OF 29N IN THE GULF OF
CALIFORNIA. ELSEWHERE, THE POSSIBLE DEVELOPMENT OF LOW PRESSURE
ALONG THE SOUTHERN COAST OF MEXICO WILL INCREASE WINDS AND SEAS
BETWEEN 100W AND 107W THE NEXT FEW DAYS.
SHORT-TERM SEA OF CORTEZ NORTHERN HALF (north of 27N)
TODAY - SW 9-12, Seas WSW 1-3 feet @ 3sec
TONITE - WSW 15-20, Seas WSW 2-4 feet @ 3sec
FRIDAY - WSW 11-15, Seas W 2-4 feet @ 4sec
FRIDAY NIGHT - WSW 12-17, Seas NW 1-3 feet @ 5sec

SHORT-TERM SEA OF CORTEZ SOUTHERN HALF (south of 27N)
TODAY - WNW 5-7, Seas SSE 2-4 feet @ 9sec
TONITE - WSW 7-10, Seas SSE 2-4 feet @ 9sec
FRIDAY - WSW 4-6, Seas SSE 2-4 feet @ 9sec
FRIDAY NIGHT - SSW 5-6, Seas SSE 3-5 feet @ 8sec

LONG-TERM SEA OF CORTEZ
SATURDAY - Northern Half WSW 12-17, Seas NW 1-3 feet @ 5sec, Southern Half NW 7-10, Seas S 3-5 feet @ 8sec
SUNDAY - Northern Half NNW 15-21, Seas NW 3-5 feet @ 4sec, Southern Half NW 11-15, Seas S 3-6 feet @ 11sec
MONDAY - Northern Half N 17-23, Seas NNW 4-7 feet @ 5sec, Southern Half NW 10-14, Seas S 3-6 feet @ 10sec
TUESDAY - Northern Half NW 11-16, Seas NW 2-4 feet @ 5sec, Southern Half NW 10-13, Seas SSE 3-6 feet @ 10sec
WEDNESDAY - Northern Half NW 11-15, Seas NW 1-3 feet @ 3sec, Southern Half WNW 8-12, Seas SSE 3-6 feet @ 10sec


**SEA OF CORTEZ SOUTHERN CROSSING FORECAST**
SHORT-TERM SOUTHERN CROSSING (along 23N)
TODAY - WNW 5-7, Seas SSE 2-4 feet @ 9sec
TONITE - WSW 7-10, Seas SSE 2-4 feet @ 9sec
FRIDAY - WSW 4-6, Seas SSE 2-4 feet @ 9sec
FRIDAY NIGHT - SSW 5-6, Seas SSE 3-5 feet @ 8sec

LONG-TERM SOUTHERN CROSSING
SATURDAY - NW 7-10, Seas S 3-5 feet @ 8sec
SUNDAY - NW 11-15, Seas S 3-6 feet @ 11sec
MONDAY - NW 10-14, Seas S 3-6 feet @ 10sec
TUESDAY - NW 10-13, Seas SSE 3-6 feet @ 10sec
WEDNESDAY - WNW 8-12, Seas SSE 3-6 feet @ 10sec


**MAZATLAN TO BANDERAS BAY FORECAST**
SHORT-TERM MAZATLAN TO BAHIA BANDERAS
TODAY - WNW 10-13, Seas SW 2-4 feet @ 13sec
TONITE - WNW 4-5, Seas SW 2-4 feet @ 13sec
FRIDAY - NW 5-8, Seas S 2-4 feet @ 8sec
FRIDAY NIGHT - ENE 1-1, Seas S 2-4 feet @ 8sec

LONG-TERM MAZATLAN TO BAHIA BANDERAS
SATURDAY - NW 7-10, Seas S 2-4 feet @ 13sec
SUNDAY - NW 9-12, Seas S 3-5 feet @ 11sec
MONDAY - NW 11-15, Seas S 3-6 feet @ 11sec
TUESDAY - W 16-21, Seas W 4-7 feet @ 5sec
WEDNESDAY - WSW 15-20, Seas SSW 4-6 feet @ 12sec


**CABO CORRIENTES FORECAST**
SHORT-TERM CABO CORRIENTES TO MANZANILLO
TODAY - WNW 8-11, Seas SSW 3-5 feet @ 9sec
TONITE - NW 3-5, Seas S 3-5 feet @ 9sec
FRIDAY - NNW 6-9, Seas S 3-5 feet @ 8sec
FRIDAY NIGHT - NNE 7-10, Seas S 3-5 feet @ 8sec

LONG-TERM CABO CORRIENTES TO MANZANILLO
SATURDAY - NNE 7-10, Seas S 3-5 feet @ 8sec
SUNDAY - NW 10-14, Seas S 4-7 feet @ 11sec
MONDAY - WNW 13-18, Seas S 5-8 feet @ 11sec
TUESDAY - W 9-13, Seas SSW 4-7 feet @ 12sec
WEDNESDAY - WSW 9-12, Seas SSW 3-6 feet @ 12sec


**MEXICAN RIVIERA FORECAST**
SHORT-TERM MEXICAN RIVIERA MANZANILLO TO BAHIAS DE HUATULCO
TODAY - ESE 10-14, Seas S 5-9 feet @ 8sec
TONITE - ESE 12-16, Seas S 5-8 feet @ 8sec
FRIDAY - ESE 19-26, Seas SSW 6-10 feet @ 8sec
FRIDAY NIGHT - SSE 8-11, Seas SSW 5-8 feet @ 7sec

LONG-TERM MEXICAN RIVIERA MANZANILLO TO BAHIAS DE HUATULCO
SATURDAY - SE 9-12, Seas SSW 5-8 feet @ 7sec
SUNDAY - ENE 9-12, Seas SW 5-9 feet @ 7sec
MONDAY - WNW 12-16, Seas SSW 5-8 feet @ 8sec
TUESDAY - WNW 9-13, Seas SSW 5-8 feet @ 8sec
WEDNESDAY - WNW 13-17, Seas SW 4-7 feet @ 20sec


**TEHUANTEPEC FORECAST**
SHORT-TERM TEHUANTEPEC
TODAY - SSW 9-13, Seas SSW 4-7 feet @ 7sec
TONITE - WSW 4-6, Seas SW 4-7 feet @ 7sec
FRIDAY - N 6-8, Seas SW 4-7 feet @ 7sec
FRIDAY NIGHT - WNW 7-9, Seas SW 5-8 feet @ 8sec

LONG-TERM TEHUANTEPEC
SATURDAY - WNW 7-9, Seas SW 5-8 feet @ 8sec
SUNDAY - SSW 9-12, Seas S 5-8 feet @ 11sec
MONDAY - SW 12-17, Seas WSW 6-9 feet @ 8sec
TUESDAY - W 13-18, Seas SW 6-9 feet @ 8sec
WEDNESDAY - WSW 16-22, Seas SW 7-11 feet @ 8sec


**GAP WINDS FORECAST**

INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N74W TO 09N87W TO LOW PRES NEAR 17.5N104W
1008 MB TO 13N107W TO LOW PRES NEAR 10N137W 1010 MB TO BEYOND
11N140W. SCATTERED MODERATE TO STRONG WITHIN 90 NM N AND 120 NM
S OF TROUGH BETWEEN 80W AND 90W...WITHIN 90 NM N AND 180 NM S OF
TROUGH BETWEEN 96W AND 140W.

..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
THE MONSOON TROUGH STRETCHES ACROSS THE ENTIRE BASIN FROM PANAMA
NEAR 09N74W TO 09N87W TO LOW PRES NEAR 17.5N104W 1008 MB TO
13N107W TO LOW PRES NEAR 10N137W 1010 MB TO BEYOND 11N140W.
SCATTERED MODERATE TO STRONG CONVECTION IS WITHIN 90 NM N AND
120 NM S OF THE TROUGH BETWEEN 80W AND 90W...AND WITHIN 90 NM N
AND 180 NM S OF THE TROUGH BETWEEN 96W AND 140W.

AN ACTIVE MONSOON TROUGH ALONG THE COAST OF CENTRAL AMERICA FROM
GUATEMALA TO PANAMA WILL HELP MAINTAIN ACTIVE CONVECTION ACROSS
COASTAL WATERS THE NEXT FEW DAYS. EXPECT SW WINDS SOUTH OF THE
TROUGH TO STRENGTHEN GRADUALLY TO 20-25 KNOTS THROUGH SATURDAY.
FURTHER SOUTH, GENTLE TO MODERATE SOUTHERLY WINDS ARE EXPECTED
TO PERSIST SOUTH OF 05N THROUGH THE WEEKEND.
NW SWELL ASSOCIATED WITH STRONG N-NW WINDS NORTH OF THE AREA IS
PRODUCING COMBINED SEAS OF 8-10 FT NORTH OF 20N BETWEEN 117W AND
135W, AND IS EXPECTED TO CONTRACT AND SHIFT EASTWARD THROUGH
FRIDAY. ANOTHER WEAKER ROUND OF NW SWELL ASSOCIATED WITH A COLD
FRONT WEST OF CALIFORNIA IS EXPECTED TO ARRIVE FRI NIGHT. HIGH
PRESSURE CENTERED WELL N OF THE AREA AND LOWER PRESSURE
ASSOCIATED WITH THE MONSOON TROUGH WILL MAINTAIN MODERATE TRADE
WINDS WEST OF 120W THROUGH THE WEEKEND.
SHORT-TERM GAP WINDS (Near 11N 86W)
TODAY - WSW 2-3, Seas SSW 3-6 feet @ 13sec
TONITE - ESE 3-4, Seas SSW 3-6 feet @ 13sec
FRIDAY - ESE 7-9, Seas SSW 3-6 feet @ 16sec
FRIDAY NIGHT - SSE 6-9, Seas SW 4-7 feet @ 7sec

LONG-TERM GAP WINDS (Near 11N 86W)
SATURDAY - SE 10-14, Seas SW 5-8 feet @ 7sec
SUNDAY - SE 11-15, Seas WSW 5-8 feet @ 7sec
MONDAY - W 11-16, Seas WSW 6-10 feet @ 8sec
TUESDAY - W 14-19, Seas WSW 7-11 feet @ 8sec
WEDNESDAY - WSW 6-8, Seas W 4-7 feet @ 8sec