Tropical Weather Discussion
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000
AXPZ20 KNHC 142135
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1957 UTC Thu Dec 14 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 1800 UTC surface analysis and satellite imagery through
2100 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: A brief gale force gap wind
event is expected in the gulf late Friday night through Sat
morning.

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

The ITCZ extends from 07N81W to 06N103W to 11N122W, then resumes
near 11N127W to beyond 10N140W. Scattered moderate convection is
noted from 09N to 11N between 112W and 120W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gulf of California: Winds will strengthen to 25 kt over the
northern Gulf of California tonight through early Sat.

A set of NW swell will propagate across the northern waters
beginning on Friday and persisting into Saturday night. A cold
front will push into Baja California Norte Sat and Sun, with
strong NW winds and large seas developing west of the front,
mainly north of 27N. Gentle to moderate winds will prevail
elsewhere in the offshore waters of Mexico, with seas in the 4-6
ft range.

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

Fresh to strong winds across the Gulf of Papagayo will diminish
tonight, then strengthen again Sat night. Fresh N winds will
funnel into the Gulf of Panama through Fri.

REMAINDER OF THE AREA...

High pressure of 1029 mb centered north of the area near 37N132W
extends a ridge southeast to near 22N112W. The pressure gradient
between this area of high pressure and lower pressure in the
vicinity of the ITCZ is supporting moderate to fresh winds north
of the ITCZ to 22N and west of 120W. NE swell propagating through
the area is supporting seas 8 ft or greater over much of the area
west of 120W. Seas associated with a fresh set of NW swell over
the NW waters is peaking near 14 ft this afternoon. Seas will
slowly subside as the swell propagates southeast the next few
days. A cold front will move into the far northern waters
Saturday. This will usher in another set of northerly swell into
the area, with seas peaking near 14 ft Saturday night near
30N122W.

$$
AL



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