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Eastern North Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 122210
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2209 UTC Tue Dec 12 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 tight pressure gradient 
continues across the Isthmus of Tehuantepec in southern Mexico. 
Latest scatterometer data indicate winds just reaching gale force
over the Gulf of Tehuantepec. High pressure north of the area
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 04N90W to 04N92W. The 
ITCZ continues from 04N92W to 10N127W to 08N140W. Scattered 
moderate and isolated strong convection are from 09N to 14N 
between 120W and 133W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gulf of Tehuantepec: Please see Special Features section above 
for details on the ongoing gale event. 

Fresh to locally strong NW winds will prevail over the northern 
part of the Gulf of California through tonight. Mainly moderate 
NW-N 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 
Thu before diminishing. Winds will once again strengthen Sat. 
Moderate to fresh N winds will funnel through the Gulf of Panama 
Thu and Fri, becoming moderate Sat. 

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 12N 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 
06N. 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