387 
AXPZ20 KNHC 170228
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0405 UTC Sat May 17 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
0200 UTC.

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

The monsoon trough extends from 10N84W to 06N128W. The ITCZ 
continues from 06N128W to beyond 05N140W. Scattered moderate 
convection is noted from 04N to 11N and E of 134W.

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

A surface ridge dominates the offshore forecast waters of Baja 
California extending SE to near the Revillagigedo Islands. This 
system supports gentle to moderate NW winds off the Baja California
peninsula, with moderate seas. Gentle to moderate winds are also
noted in the southern Gulf of California. Elsewhere across the 
Mexican offshore waters, including the remainder of the Gulf of 
California, light and variable winds prevail. Moderate seas are 
noted elsewhere except for slight seas in the Gulf of California.

For the forecast, a ridge will continue to dominate the weather 
pattern across the offshore waters of Baja California through the
upcoming weekend, supporting moderate to fresh NW winds and 
moderate to rough seas. Moderate or weaker winds and moderate 
seas, primarily in SW swell, will prevail elsewhere. A low pres 
is forecast to develop over the northern Gulf of California by 
tonight producing fresh to strong S to SW winds through Sat 
night. Rough seas generated by fresh to strong northerly winds 
offshore California will reach the waters N of Punta Eugenia Sun 
night into Mon. Building seas to around 10 ft are expected. This 
swell event will continue to propagate southward, mainly across 
the waters N of 25N between 118W and 130W by Mon night. 

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

Recent satellite derived wind data depicts gentle to moderate 
east winds across the Papagayo region and the coast of Nicaragua 
and downwind to 89W. There is also a pulse of moderate SW winds
in the Gulf of Panama. Light to gentle winds are noted elsewhere
N of the monsoon trough while gentle to moderate S winds are 
noted south of the it. Winds and seas are higher near 
thunderstorms along the monsoon trough.

For the forecast, abundant moisture drawn in by a very moist and
unstable southerly wind flow is expected to persist across the 
offshore waters of Costa Rica, Panama and Colombia through the 
upcoming weekend, supporting the development of showers and 
thunderstorms over this area. Gentle to moderate winds will 
prevail across the region through Sun, then diminish on Mon. 
Slight to moderate seas, primarily in SW swell, are expected. 

...REMAINDER OF THE AREA....

High pressure of 1031 mb is located NW of area near 33N145W. Its
associated ridge dominates the waters north of the ITCZ and west
of 110W. The pressure gradient between the ridge and lower 
pressure in the vicinity of the ITCZ is supporting moderate to 
fresh winds N of the ITCZ and W of 125W. Rough seas are within 
these winds. Gentle to moderate winds and moderate seas are noted
elsewhere in a mix of swell.

For the forecast, the pressure gradient will continue to support
moderate to fresh NE winds north of the ITCZ and west of 125W 
through early next week. The NW swell will combine with wind
waves to keep and area of rough seas over the west-central 
waters this upcoming weekend, particularly from 10N to 20N west 
of 130W. A new swell event will reach the N waters Sun night 
into Mon, building seas to around 10 ft N of 25N between 118W 
and 130W by Mon night.

$$
ERA