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Eastern North Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 130304
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
053 UTC Wed Dec 13 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 0000 UTC surface analysis and satellite imagery through
0300 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: High pressure over eastern
Mexico is helping produce a tight pressure gradient across the 
Isthmus of Tehuantepec in southern Mexico. This gradient is
supporting gale force over the Gulf of Tehuantepec. The area of 
high pressure will shift eastward and weaken. This will loosen 
the pressure gradient over the area and help to diminish winds 
below gale force by Wednesday night, and further to 20 kt or less
Thursday.

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

The monsoon trough extends from 08N82W to 05N92W. The ITCZ 
continues from 05N92W to 10N127W to 09N140W. Scattered moderate 
and isolated strong convection are noted from 09N to 14N between 
120W and 136W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gulf of Tehuantepec: Please see Special Features section above 
for details on the ongoing gale event. Another, brief, gale force
gap wind event is possible Friday night into Saturday morning. 

Fresh to strong winds across the N Gulf of California will 
persist tonight before diminishing Wednesday. Winds will once 
again strengthen Thu night through Sat. Gentle to moderate winds
will prevail elsewhere over the offshore Pacific waters, with 
seas in the 4-6 ft range.

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

Strong winds will prevail across the Gulf of Papagayo through 
midweek before diminishing. Winds will once again strengthen Sat 
night. Moderate to fresh N winds will funnel through the Gulf of 
Panama Thu and Fri.

REMAINDER OF THE AREA...

The pressure gradient between high pressure centered north of 
the area and lower pressure in the vicinity of the ITCZ is
maintaining an area of fresh to strong winds from 14N to 17N 
between 130W and 135W. The area of high pressure will weaken over
the next 24 hours which will help loosen the pressure gradient 
and diminish winds to 20 kt or less by Wednesday. NW swell covers
much of the forecast waters west of 120W and north of 04N. A 
fresh set of NW swell has reached the NW waters. Seas associated 
to this swell will peak near 13 ft Wed night and Thu morning 
before starting to subside. 

$$
AL

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Page last modified: Wednesday, 13-Dec-2017 03:04:52 UTC