000
AXPZ20 KNHC 181558
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1605 UTC Sun Apr 18 2021

Tropical Weather Discussion for the eastern Pacific Ocean from
the Equator to 32N, east of 140W. The following information is
based on satellite imagery, weather observations, radar, and
meteorological analysis.

Based on 1200 UTC surface analysis and satellite imagery through
1510 UTC.

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

The monsoon trough extends from 08N78W to 09N100W to 06N117W. 
The ITCZ axis extends from 06N117W to 04N140W. Scattered moderate
convection is from 01N to 13N E of 100W and within 180 nm N of
the monsoon trough and ITCZ W of 100W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A surface high pressure is anchored by a 1025 mb high near 
31N132W and lower pressure continues along western Mexico and 
the Gulf of California. The pressure gradient between these two 
features conitnue to support moderate to fresh NW winds across 
the Baja California offshore waters this morning with seas to 6 
ft. Winds are expected to decrease to gentle to moderate NW 
winds this afternoon and then remain at that speed through the 
middle of the week. Seas will increase briefly to 8 ft NW of 
Punta Eugenia by early Wed as the tail of a cold front moves
across the northern Baja peninsula.

Fresh to locally strong NW winds are along the northern Gulf of 
California, N of 27N, and will continue through early this evening.
Light to gentle variable winds will then prevail through Tue. 
Winds in the northern gulf are forecast to shift S to SW and
increase to fresh to strong Tue afternoon ahead of a cold front
that will push south across the Gulf of California on Wed. These
strong winds will then continue through Thu with seas building 
to 5 ft.

Fresh winds will pulse over the Gulf of Tehuantepec tonight into
Mon with seas building to 6 ft. A second weak gap wind event is
forecast to begin Wed and continue through Thu morning with seas
building to 8 ft. 

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

Fresh to strong winds will pulse nightly across the Gulf of 
Papagayo on Wed night through Fri night. Seas will be 4 to 6 ft,
building to 8 ft by Thu night. Across the rest of the area, 
light to gentle winds will prevail with 4 to 6 ft seas through 
midweek. Enhanced long-period SW swell is forecast to reach the
Equatorial offshores today with seas increasing to 8 ft by 
midweek. The swell will reach the Central America offshores by 
Mon. Meanwhile, widespread convection will increase in coverage 
today which will impact the Central America and Colombia 
offshores. Coverage of the convective activity is expected to 
decrease by Sun night but still continue into Mon.

REMAINDER OF THE AREA...

The pressure gradient between a 1025 mb high near 31N131W and 
lower pressures across the ITCZ supports moderate to fresh NE to 
E winds between the ITCZ and 20N, W of 120W with seas to 8 ft. 
Gentle to moderate NE to E trade winds with seas to 7 ft are 
elsewhere between the ITCZ/monsoon trough to 20N between 110W and
125W. The high pressure will continue to build Sun through early
next week, supporting fresh to locally strong winds through Tue 
mainly W of 125W. Seas are expected to build up to 10 ft, 
enhanced by mixed SW and NW swell.

$$
Ramos