000
AXPZ20 KNHC 100901
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
552 UTC Tue Apr 10 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 0600 UTC surface analysis and satellite imagery through
0900 UTC.

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

A surface trough extends from 08N81W to 05N106W. The ITCZ 
extends from 09N114W to 09N127W to 07N140W. Scattered moderate 
isolated strong convection is noted within 120 nm either side of 
the surface trough between 81W and 89W. Scattered moderate 
convection is noted from 10N to 12N between 103W and 118W. 
Scattered moderate convection is noted within 60 nm N of the 
ITCZ between 120W and 125W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

NW swell off Baja California will subside below 8 ft today. 
Another round of strong NW winds and large NW swell are expected 
starting Thu. Farther south, fresh to strong winds are expected 
in the Gulf of Tehuantepec late tonight. Strong winds are 
possible across the length of the Gulf of California as high 
pressure builds over the Great Basin Fri night into Sat. 

Looking ahead, another Gulf of Tehuantepec gale force gap wind 
event is possible Sunday into early next week.

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

Light to gentle winds are expected through the forecast period. 
Seas in the 2 to 4 ft range will prevail, except south of 05N 
where southerly swell will maintain seas of 3 to 5 ft. Fresh gap 
winds are possible in the Gulf of Papagayo by mid week. 

REMAINDER OF THE AREA... 

The pressure gradient between lower pressure in the vicinity of
the ITCZ and high pressure of 1022 mb centered near 27N129W is 
producing mainly gentle to moderate trades north of the ITCZ to 
20N. Light to gentle winds prevail over much of the forecast 
waters N of 20N, except west of a cold front from 30N134W to 
26N140W, where moderate northerly winds prevail. Though winds 
associated to this front will remain below 25 kt, the front has 
ushered in a set of NW swell. The swell will propagate 
southeastward the next several days, with seas greater than 8 ft 
covering the waters north of a line from Baja California Norte to
08N140W by Thu. A second NW swell will move into the northern 
waters Thu night into Fri, bringing seas to near 13 ft over the 
waters north of 20N and west of 120W. Yet another NW swell will 
move into the NW waters Sat, with seas once again reaching near 
13 ft over the far NW waters.

$$
AL