000
AXPZ20 KNHC 241548
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1323 UTC Tue Oct 24 2017

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
1415 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Storm Warning:
Gale force winds today are forecast to further increase to storm
force tonight as a reinforcing cold airmass builds north of the 
area, with seas building to near 24 ft by midweek. The storm 
force winds should diminish Wednesday evening, with gale force 
winds persisting into Thursday. Winds may once again increase to 
gale force this weekend.

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

The monsoon trough extends across central America near 12N86W to
09N98W to 09N120W to 09N140W. Scattered moderate isolated strong
convection are from 05N to 10N E of 89W. Widely scattered 
moderate convection is N of 07N between 89W and 100W, and from
08N to 13N between 118W and 136W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Please see the special features section above for information on
a developing storm event in the Gulf of Tehuantepec.

Northwest swell with wave heights of 8 to 9 ft will prevail off 
Baja California Norte today before subsiding below 8 ft. Gentle 
breezes associated with a weak pressure pattern along with slight
to moderate seas will prevail by late week. 

High pressure over the Great Basin region of the western United 
States is maintaining fresh to strong winds over the northern  
Gulf of California. These winds are expected to continue through 
Wednesday, before diminishing as the area of high pressure shifts
eastward and the pressure gradient weakens. 

OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR...
   
Gentle to moderate winds will prevail N of the monsoon trough, 
with fresh to strong winds S of the monsoon trough. The fresh to 
strong winds will support building seas of 8 to 10 ft SW of 
western Panama and Costa Rica Wednesday through Saturday. NW 
swell originating from the Gulf of Tehuantepec will propagate 
into the offshore waters of Guatemala and El Salvador today 
through Friday. Broad low pressure may develop along the monsoon
trough by the end of the week, drifting to the NW, helping to 
reinforce the seas greater than 8 ft. 

REMAINDER OF THE AREA...

NW swell with seas in the 8 to 10 ft range continues across much
of the forecast waters north of 05N and west of 110W. The swell 
will decay through midweek with seas less than 8 ft expected by 
Wednesday evening W of 110W. Tranquil marine conditions are then 
expected over these waters through early Friday, when a fresh 
set of NW swell will move into the northwest waters. Seas will 
rapidly build and peak near 14 ft near 30N140W Friday night 
before beginning to subside. E of 110W, large swell from the 
Gulf of Tehuantepec event will propagate over the waters N of 03N
tonight through Friday night. 

$$
Latto