605
AXPZ20 KNHC 110256
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0405 UTC Thu Dec 11 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
0000 UTC.

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

The monsoon trough extends from 1006 mb low pressure over the
Gulf of Panama near 08N79.5W to 06.5N84.5W to 10N102W to 07N110W
to 09.5N118W. The ITCZ continues from 09.5N118W to 11N128.5W to
beyond 08N140W. Scattered moderate and isolated strong
convection is noted from 09N to 12N between 105W and 108W, and
from 07N to 17N between 108W and 140W.

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

Fresh to strong gap winds are over and downstream the Gulf of
Tehuantepec, with seas in the immediate Gulf 4-5 ft, but remnant
6-8 ft seas decaying all the way SW to 12N100W. Elsewhere, a
ridge extends from high pressure located N of the area to across
the offshore forecast waters of Baja California. The pressure
gradient between this ridge and a trough over western Mexico is
supporting gentle to moderate winds over the Gulf of California,
as well as near Cabo Corrientes. Light to gentle winds and
moderate seas in long period NW swell are noted across the
remainder of the Mexican offshore waters, with slight to moderate
seas in the Gulf of California and nearshore SW Mexico.

For the forecast, fresh to strong northerly gap winds will
prevail in the Gulf of Tehuantepec through Fri morning, then
moderate to fresh through Sat morning. Winds over Tehuantepec
will strengthen again on Sat afternoon and night, possibly
reaching gale-force Sun night through at least Mon night. Mainly
gentle to moderate winds and moderate seas will prevail
elsewhere, locally fresh near Cabo Corrientes and in the Gulf of
California through the end of the week.

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

Moderate to locally fresh winds are over and downstream the Gulf
of Papagayo. Light to gentle winds are elsewhere N of 05N, except
moderate in the Gulf of Panama. Gentle to locally moderate
southerly winds prevail S of 05N. Seas are mainly moderate in
mixed SW and NW swell, with exception of slight seas nearshore
from Colombia northward to Costa Rica, as well as near the
Galapagos Islands.

For the forecast, moderate N winds will pulse in the Gulf of
Panama. Otherwise, mainly gentle winds will prevail N of the
monsoon trough over the next several days, except pulsing to
moderate to fresh in the Gulf of Papagayo, locally strong at
times. Gentle to moderate winds will prevail S of monsoon trough.
Moderate seas in mixed SW and NW swell are expected over the
regional waters through the weekend and into early next week.
Seas may build offshore Guatemala by early next week due to a
possible Gulf of Tehuantepec gap wind event.

...REMAINDER OF THE AREA...

High pressure dominates the waters N of the ITCZ and monsoon
trough. The pressure gradient between this area of high pressure
and lower pressure in the vicinity of the ITCZ and monsoon trough
is supporting moderate to fresh winds N of the ITCZ to 21N and
west of 120W. Seas are in the 5 to 7 ft range over these waters.
Gentle to moderate winds, and seas of 4 to 7 ft, prevail
elsewhere over the discussion waters, except near 30N140W where
new NW swell is arriving and building seas to around 8 ft.

For the forecast, the new set of NW long period swell is
forecast to spread SE of 30N140W tonight, building seas to 8-9
ft over these waters before subsiding by the end of the week. The
pressure gradient may tighten by the end of the weekend with
trades just N of the monsoon trough and ITCZ freshening into
early next week.

$$
Lewitsky