000
AXPZ20 KNHC 092126
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2126 UTC Mon Apr 9 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 1800 UTC surface analysis and satellite imagery through
2115 UTC.

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

A surface trough extends from 10N84W to 03.5N100W to 09N113W. 
The intertropical convergence zone continues from 09N113W to 
05N140W. Scattered moderate convection from 04N to 07N between
82W and 88W. Scattered moderate convection also noted from 10N to
12N between 110W and 115W, and from 10N to 12N between 125W and
130W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Recent altimeter satellite passes indicate seas 8 to 11 ft in NW
swell and will prevail off mainly Baja California Norte through 
tonight before subsiding early Tue. A weak frontal boundary will
move into Baja California Norte Tue night then weaken to a 
trough stalling from northern Gulf of California to past Punta 
Eugenia by late Wed. High pressure building west of this boundary
along with deepening low pressure over the Great Basin and 
central Rockies will support fresh to strong NW winds off the 
coast of Baja California Norte Thu night into Fri. Large NW swell
to 13 ft will accompany the winds, with seas to 8 ft reaching 
the Revillagigedo Islands by Sat. Looking ahead, strong winds are
possible across the length of the Gulf of California as high 
pressure builds over the Great Basin Fri night into Sat.

Farther south, fresh to strong winds with 8 to 11 ft seas will 
develop in the Gulf of Tehuantepec Wed and Wed night.

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 2-4 ft range will prevail, except south of 05N where 
southerly swell will keep seas in the 3 to 5 ft range. 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 the subtropical ridge north of 25N is maintaining 
mainly light to gentle winds north of 15N, with moderate to 
occasionally fresh trades farther south. A cold front is starting
to move into the waters north of 25N. The front will be accompanied
by large NW swell with seas peaking in the 10 to 15 ft range 
over the waters north of 25N and west of 130W Tue. NW swell of 8 
to 11 ft will cover the region north of 15N and west of 130W 
through mid week, then propagate eastward covering the region 
north of a line from Baja California Norte to 08N140W by late 
this week with 8 to 12 ft swell. Looking ahead, another NW swell 
group will move into the waters north of 25N west of 130W Sat 
reinforcing the previous swell group. 

$$
Christensen