Tropical Weather Discussion

axpz20 knhc 261545

Tropical weather discussion
NWS National Hurricane Center Miami FL
1515 UTC Thu Apr 26 2018

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
1445 UTC.

...Intertropical convergence zone/monsoon trough... 

A surface trough extends from 11n86w to 08n100w. The 
intertropical convergence zone continues from 08n100w to 09n115w
to beyond 05n140w. Scattered moderate and isolated strong
convection is from 04n to 10n between 80w and 87w. Scattered 
moderate convection is from 04n to 11n between 115w and 129w. 
Isolated moderate convection is from 03n to 08n between 95w and 
107w and from 04n to 06n between 132w and 139w. 


Offshore waters within 250 nm of Mexico...

A ridge is building NW of the area in the wake of a dissipated 
cold front. This will bring about fresh NW winds in the offshore
waters by late today. Seas will build to 8 ft tonight off Baja 
California sur south of Cabo San Lazaro toward the revillagigedo 
islands in a combination of the 15 to 20 kt NW flow and longer 
period NW swell propagating through the region. The fresh NW 
winds will expand W of Baja California Fri into Sat and will
become locally strong as troughing forms over the Colorado River
Valley North of the region. The large area of fresh to 
occasionally strong NW winds will allow 8 to 10 ft seas off the 
Baja California coast through sun. Winds and seas will slowly
subside early next week over this area.

Light to gentle W to NW winds are expected in the Gulf of 
California through Sat. Fresh to locally strong winds will be
possible over the northern Gulf sun through Tue due to troughing
over the area. 

Farther south, fresh to strong northerly winds are possible in 
the Gulf of Tehuantepec this weekend, particularly during Sat 
morning as high pressure builds over the western Gulf of Mexico. 

Elsewhere, mainly light to gentle winds are expected through 
sun with 4 to 6 ft seas.

Offshore waters within 250 nm of Central America, Colombia, and 
within 750 nm of Ecuador... 

Fresh northeast nocturnal winds are expected in and downstream 
of the Gulf of papagayo through tonight, resuming on Sun night. 
Gentle to moderate offshore flow will prevail elsewhere N of 09n,
and light to gentle SW winds are expected S of 09n with seas of 
4 to 6 ft.

Remainder of the area... 

A surface trough, the remnants of a dissipated cold front,
extends from 30n136w to 28n139w. A ridge will build behind this
trough through the weekend. Moderate to fresh northeast trade 
winds and 7-9 ft seas are observed across the tropical waters W
of 115w between 07n and 20n, south of the subtropical ridge and 
north of the the ITCZ. These winds will increase to fresh to 
locally strong as the pressure increases north of this region 
into the upcoming weekend. This will also result in an increase 
of the areal coverage of seas of 8-9 ft.



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