Tropical Weather Discussion

axpz20 knhc 270402

Tropical weather discussion
NWS National Hurricane Center Miami FL
402 UTC Fri Apr 27 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 0000 UTC surface analysis and satellite imagery through
0330 UTC.

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

A surface trough extends from 08n84w to 08n100w. The 
intertropical convergence zone continues from 08n100w to beyond 
06n140w. Scattered moderate convection is from 03n to 08n 
between 85w and 95w and from 05n to 12n between 115w and 130w.


Offshore waters within 250 nm of Mexico...

Moderate NW winds off the coast of Baja California will increase
to fresh through the morning as ridging builds west of the area 
and a trough forms over the Colorado River valley through the 
northern Gulf of California. A recent altimeter pass showed seas 
to 8 ft between the revillagigedo islands and Cabo San Lazaro, 
likely with a component of NW swell. NW winds off Baja California
norte will increase late Fri through Sat night as an upper trough
moves across the region allowing the surface low pressure to
deepen. Seas will build north of Cabo San Lazaro with the
increase winds, reaching 8 to 10 ft, but subside farther south.
Winds and seas diminish through early next week as the trough
shifts eastward and high pressure builds into the region.

Pulses of strong westerly gap winds are possible over the 
northern Gulf of California as the trough shifts eastward late
sun into Tue. 

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 beginning 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 32n130w to 27n135w. A ridge is building behind this
trough as the trough weakens, reaching from 1026 mb high pressure
near 36n146w to the revillagigedo islands. Moderate to fresh 
northeast trade winds and 7-9 ft seas are observed across the 
tropical waters W of 115w between 08n 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. 
Winds and seas will decrease early next week as the high center 
shifts northward. 



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