Tropical Weather Discussion
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000
AXPZ20 KNHC 170304
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
041 UTC Sun Dec 17 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.

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

The ITCZ extends from 07N92W to 07N101W to 10N124W to beyond
09N140W. Scattered moderate and isolated strong convection is
noted within 60 nm N of the ITCZ between 102W and 105W and within
60 nm S of the ITCZ between 110W and 115W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gulf of Tehuantepec: Strong winds over the Gulf of Tehuantepec
will diminish tonight. Starting Sunday night, nocturnal winds
will pulse to strong through midweek.

Gulf of California: A cold front will enter the northern Gulf of
California tonight, then continue SE and dissipate over the
central Gulf on Sun. Winds over the northern Gulf ahead of the
front have strengthened. The main issue tonight will be the
likelihood of strong W to NW winds over the northern Gulf as low
pressure shifts eastward into the Sonora Desert. While the fetch
across the northern Gulf will be too limited to develop large
seas, mariners should be aware of the possibility of strong gusty
winds funneling through low lying areas of Baja California Norte
through early Sun. Winds will diminish through early next week
after the front dissipates.

Winds have strengthened, and seas have built to around 14 ft
off the coast of Baja California. Seas will build to as high as
16 ft in NW swell by Sunday morning. These seas will start to
subside Sunday, but seas of 8 to 10 ft will cover most of the
waters beyond 60 nm of the Baja coast through early next week.
Elsewhere gentle to moderate winds and 3 to 5 ft seas will
persist along the coast of Mexico outside of the Gulf of
Tehuantepec through mid week.

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

Winds will strengthen across the Gulf of Papagayo tonight
through Sunday night. Fresh N winds will funnel into the Gulf of
Panama tonight.

REMAINDER OF THE AREA...

Fresh to strong winds prevail over the waters N of 27N, with
seas building to near 15 ft in northerly swell. Seas associated
to this swell will peak near 16 ft tonight before starting to
subside. Moderate to fresh winds prevail elsewhere over the
forecast waters north of the ITCZ to 20N and west of 120W. A
fresh set of NW swell has propagated into the northern waters.

$$
AL



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