000
AXPZ20 KNHC 182142
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 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 1800 UTC surface analysis and satellite imagery through
2120 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 00N to 13N E of 95W and within 210 nm N of 
the monsoon trough and ITCZ W of 95W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A surface high pressure is anchored by a 1028 mb high near 
31N134W and lower pressure continues along western Mexico and 
the Gulf of California. The pressure gradient between these two 
features continue to support moderate to locally fresh NW winds 
across the Baja California offshore waters this afternoon with 
seas to 6 ft. Winds are expected to decrease to gentle to 
moderate NW winds early on Mon 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 again 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 tonight but still continue into Mon.

REMAINDER OF THE AREA...

The pressure gradient between a 1025 mb high near 31N132W 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
120W. The high pressure will continue to build today 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