000
AXPZ20 KNHC 091542
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1542 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 1200 UTC surface analysis and satellite imagery through
1530 UTC.

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

A surface trough extends from 09N83W to 08N110W. The
intertropical convergence zone continues from 08N110W to 05N140W.
Scattered moderate convection is noted from 09N to 11N between
105W and 135W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

NW swell, with seas in excess of 8 ft, will prevail off mainly 
Baja California Norte through tonight before subsiding. A weak
frontal boundary will move into Baja California Norte Tue night
then weaken to a stalling trough reaching 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 high pressure of 1023 mb centered north of the area
near 37N128W is maintaining mainly light to gentle winds north 
of 15N, with moderate to occasionally fresh trades farther south.
A cold front will move into the waters north of 25N today, 
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