Eastern North Pacific Tropical Weather Discussion

378 
AXPZ20 KNHC 192015
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 UTC Tue May 19 2026

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 1800 UTC surface analysis and satellite imagery through
1930 UTC.

...TROPICAL WAVES...

A tropical wave is near 88W, extending north of 04N into
El Salvador and Honduras, and is moving west at 5 kt. It is 
enhancing convection near the monsoon trough described in the 
section below.

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

The monsoon trough extends from 10.5N75W to 04.5N78W to 08N88W. 
The ITCZ extends from 08N91.5W to 08.5N104W to 06N120W to 
07.5N131W to beyond 07.5N140W. Scattered moderate isolated 
strong convection is noted from 04N to 10N E of 94W, and from 
03N to 13N between 100W and 135W.

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

Gentle NW to N breezes continue to cover most of the Mexican 
offshore waters this afternoon, as a surface trough from just W 
of Isla Guadalupe along 120W extending SW to near 25N122W is 
partially blocking a broad ridge to the W of the region. South of
the trough, the ridge extends modestly into Baja Sur, with gentle
to moderate northerly winds prevailing across the waters south 
of Cabo San Lazaro to the Revillagigedo Islands, where winds veer
from the N-NE. Light to gentle breezes are noted inside the Gulf
of California. Large N to NW moving through the regional waters 
is gradually subsiding, but still producing seas of 7-9 ft off of
Baja California and spreading southward to the Revillagigedos. 
Light to gentle wind and seas of 4-6 ft primarily in NW swell are
elsewhere across the Mexican waters between Tehuantepec and the 
Revillagigedo Islands.

For the forecast, large NW swell will gradually subside across
the waters off of Baja California and through the Revillagigedo 
Islands tonight through Wed, subsiding below 8 ft by Wed evening.  
Moderate NW swell will then dominate the area waters into the
weekend. A ridge extending across the region along roughly 21N 
will support mostly gentle to moderate NW winds across the
area waters, with fresh winds possible near the coast of Cabo 
San Lucas each afternoon and evening.
 
....OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA,
AND WITHIN 750 NM OF ECUADOR...

Fresh NE to E gap winds with 5-8 ft seas prevail across the 
Papagayo region and extend offshore to near 90W this afternoon.
Moderate easterly winds then extend beyond 90W to well south of
Tehuantepec. Gentle to moderate breezes with 3-5 ft seas in SW 
swell are noted elsewhere. Scattered showers and thunderstorms 
are active along the coastal waters and over interior portions of
Costa Rica, Panama, and NW Colombia, behind a tropical wave 
moving through the region.

For the forecast, fresh to occasionally strong winds will pulse 
across the Papagayo region, mainly in the overnight and early 
morning hours through Thu morning, then diminish through Sat. 
Elsewhere, gentle to moderate winds along with moderate seas in 
southerly swell are expected through the end of the week.

...REMAINDER OF THE AREA...

A broad surface ridge extends southward from a 1034 mb high near
38N141W southward to the ITCZ, and southeastward around a low
level trough just W of Isla Guadalupe, to near the Revillagigedo
Islands. This ridge is supporting moderate to fresh N to NE 
winds north of 09N and west of 122W. Large to moderate N to NE 
swell continues to move through the regional waters generally N 
of 10N this afternoon, producing seas in this area from 7 to 11 
ft to the W of 110W. For the waters north of the ITCZ east of 
120W, gentle to moderate NE to E winds with 6 to 9 ft seas in 
mixed moderate swells prevail. Gentle to moderate SE to S winds 
and seas at 5 to 8 ft in mixed moderate swells prevail south of 
the ITCZ. Active convection is along the ITCZ between 100W and 
125W.

For the forecast, the aforementioned ridge will continue to 
gradually weaken while shifting southwestward through the end of
the week. This will allow winds and seas north of the ITCZ to 
steadily subside from east to west through midweek, becoming 
gentle to moderate winds with 6 to 7 ft seas by Fri. Winds south
of the ITCZ will also becoming gentle by Fri with seas remaining
at 5 to 7 ft in mixed swell.

$$
Stripling