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Eastern North Pacific Tropical Weather Discussion

AXPZ20 KNHC 011606

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1605 UTC Tue Dec 1 2020

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
1530 UTC.


Gulf of Tehuantepec Gale Warning: A gap wind event continues 
over the Gulf of Tehuantepec as strong surface high pressure
builds across the Gulf of Mexico in the wake of a cold front.  
Gale force winds are expected to prevail today through the early
night hours with building seas to 22 ft. Marine interest 
transiting across or in the vicinity of the Gulf of Tehunatepec 
should be aware of this gap wind event, and take necessary 
action to avoid these hazardous marine conditions over the 
affected waters. Please, see the latest High Seas Forecast issued
by the National Hurricane Center at website for more details.


The monsoon trough extends from 09N84W to 08N100W to 08N120W to
08N133W. Scattered moderate convection is from 03N to 09N E of
84W, from 07N to 14N between 98W and 125W.


A Gale Warning is in effect for the Gulf of Tehuantepec. Please,
see Special Feature Section for more details. 

Gentle to moderate NW winds prevails over Baja California Norte
offshore waters with seas to 7 ft. Long period NW swell starting
to enter the waters N of Punta Eugenia with seas to 8 ft will
subside Wed night. Light to gentle winds will prevail elsewhere
off the peninsula through early Thu. Fresh to strong winds are
forecast to funnel through the Baja California Norte mountain
passages Thu through Fri morning as strong high pressure builds
over the Great Basin region. 

Moderate to fresh northerly winds along the Gulf of California 
will prevail through Wednesday with seas ranging between 3 to 5 
ft. Fresh to strong northerly winds are forecast to begin over
the northern gulf waters early on Thu, rapidly increasing to 
near gale force with building seas to 9 ft. These conditions will
extend along the gulf waters and continue through Sat when winds
are forecast to diminish to moderate to fresh. 


Fresh to strong NE to E winds in the Gulf of Papagayo are expected
through Thu with seas building to 9 ft. Mainly moderate to fresh
NE winds will prevail the remainder of the forecast period. Seas
generated by a strong gap wind event in the Gulf of Tehuantepec 
will propagate across the offshore waters of Guatemala and El 
Salvador through tonight.

Elsewhere, moderate S to SW winds are expected S of the monsoon
trough with mainly gentle easterly winds N of the monsoon trough.


Surface high pressure continue to dominate the northern forecast
waters. The pressure gradient between the ridge and lower 
pressure within the monsoon trough is supporting moderate to 
fresh NE to E winds north of 10N and west of 120W. Seas are 
generally 6-8 ft across this area.

A surface trough is analyzed from 10N132W to 17N132W. Scattered 
moderate convection is in the vicinity of this elongated area of 
low pressure. Fresh to locally strong NE winds are from 12N to 
17N between 125W and 133W with seas to 8 ft.

A new set of long period NW swell is entering the NW corner of 
the forecast region today building seas to 8-10 ft N of 11N and W
of a line from 26N123W to 12N130W by this afternoon. Another and
larger NW swell event will begin to propagate across the NW waters
on Wed, with building seas of 12-16 ft W of a line from 30N133W 
to 20N140W by Wed night into Thu.