877 
AXPZ20 KNHC 180355
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0405 UTC Fri Apr 18 2025

Tropical Weather Discussion for the eastern Pacific Ocean from
03.4S to 30N, east of 120W including the Gulf of California, and
from the Equator to 30N, between 120W and 140W. The following
information is based on satellite imagery, weather observations,
radar, and meteorological analysis.

Based on 0000 UTC surface analysis and satellite imagery through
0330 UTC.

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...

A trough extends from a 1007 mb low over northwestern Colombia to
07N77W to 08N83W to 05N93W. The ITCZ continues from 05N93W to
06N127W. A second ITCZ is noted from 01S120W to beyond 05S140W.
Scattered moderate convection is occurring within 120 NM of the
trough axis, and from 03N to 10N between 103W and 133W. 

...OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A trough has been analyzed from 30N121W to 25N125W, and ridging
extends over the the waters offshore of Baja California. Farther
east, troughing prevails over the Gulf of California. The
pressure gradient between these features supports moderate to
locally fresh NW winds through the Gulf of California and 
offshore of Baja California, and locally strong winds in the 
northern Gulf. Farther south, gentle to locally moderate winds 
prevail offshore of southern and southwestern Mexico. Seas of 3 
to 6 ft are noted over much of the Mexico offshore waters, with 1
to 4 ft seas observed through the Gulf of California. 

For the forecast, fresh to strong W to NW winds will pulse in 
the central and northern Gulf of California through Fri morning 
as a strengthening pressure gradient develops between troughing 
over the region and high pressure to the west. A second surge of 
fresh to locally strong winds are expected Fri night into early 
Sat, with diminishing winds expected thereafter. Elsewhere, 
locally fresh NW winds will pulse offshore of Baja California 
Sur each night and morning through Sun, and offshore of Jalisco 
this weekend. Otherwise, prevailing ridging over the eastern 
Pacific will support moderate winds and moderate seas offshore 
of Baja California and southwestern Mexico into early next week. 

...OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, 
AND WITHIN 750 NM OF ECUADOR...

Recent scatterometer satellite data depicts strong E winds in 
the Gulf of Papagayo as a strong pressure gradient prevails 
between a 1007 mb low centered over northwestern Colombia and a 
1021 mb high in the northeastern Gulf of America. Locally rough 
seas to 8 ft in E swell are noted in this region. Moderate to 
locally fresh E winds extend beyond the Papagayo region, 
impacting areas well offshore of Guatemala and El Salvador. 
Elsewhere, fresh N winds are occurring through the Gulf of 
Panama. Otherwise, gentle to locally moderate winds and seas of 4
to 6 ft in S swell, as noted on recent altimeter satellite data,
are occurring through the remainder of the regional waters. 

The Santa Maria Volcano located in southwestern Guatemala near 
14.8N91.6W is presently undergoing continuous volcanic ash 
emissions. The volcanic ash near the volcano is moving to the 
southwest. Latest GOES-E satellite imagery shows resultant hazy 
skies near and along the coast of Guatemala. Reduced visibility 
is possible near the coast. Mariners are encouraged to be aware 
of the latest updates on the status of the volcano. 

For the forecast, strong E to NE winds will pulse in the Gulf of
Papagayo through this weekend as a strong pressure gradient 
prevails between the Colombian low and ridging over the eastern 
Gulf of America and western Atlantic. Winds may reach near-gale 
force at times tonight and again Fri night, and locally rough 
seas in E swell will accompany these winds. Winds are expected to
diminish slightly early next week. Elsewhere, pulsing fresh to 
locally strong N winds will occur each night and morning in the 
Gulf of Panama through Sat. Looking ahead, a new long-period S 
to SW swell will propagate through the regional waters early next
week.

...REMAINDER OF THE AREA....

A trough has been analyzed over the north-central waters from 
30N121W to 25N125W, and moderate NW to W winds are noted near 
this feature. Otherwise, a 1031 mb centered north of the area 
near 40N140W extends ridging through much of the eastern Pacific
waters north of the ITCZ. Widespread moderate N to NE winds are 
occurring along the periphery of the ridge, with locally fresh NE
winds noted from 10N to 22N west of 130W. Locally rough seas in 
a short-period, wind-generated E swell are noted from 05N to 13N 
west of 120W. Elsewhere, seas of 4 to 7 ft prevail north of the 
ITCZ. Farther south, a long-period southern Hemisphere swell is 
promoting locally rough seas to 8 ft just south of the equator 
and west of 105W. Moderate SE winds prevail in this region. 

For the forecast, ridging will continue to dominate the eastern
Pacific waters over the coming days, supporting moderate N to E
winds north of the ITCZ into early next week. Pulsing fresh NE
winds are expected overnight through Sun between 05N and 20N,
west of 115W. A short-period, wind-generated E swell will promote
rough seas in this region through early next week. Farther south,
rough seas in S swell south of the equator will subside through
Sat morning. Looking ahead, new N swell will lead to rough seas
in the northern waters, north of 25N, by early next week. 

$$
ADAMS