000
AXPZ20 KNHC 031535
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1605 UTC Thu Dec 3 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
1500 UTC.

...SPECIAL FEATURES...

Gulf of California Gale Warning: Strong high pressure building
across the Great Basin region of the U.S. will increase northerly
winds in the Gulf of California through Fri night. Peak winds are
expected today in the northern Gulf, with gale-force winds likely
N of 29N. Strong gusty NE winds are also expected on the west 
side of the Baja California peninsula mainly from 26N-29N with 
frequent gusts to gale force possible. Please read the latest NWS
High Seas Forecast issued by the National Hurricane Center at 
website https://www.nhc.noaa.gov/text/MIAHSFEP2.html for more 
details.

Gulf of Tehuantepec Gale Warning: Strong northerly gap winds and
building seas are expected across the Tehuantepec region most of
the forecast period. These winds will be associated first with a
cold front moving across the western Gulf of Mexico, then with a
surface trough developing north of the central Bay of Campeche on
Sat. Strong to gale force winds are expected tonight and Fri, and
then again Sun through Mon night. Seas are forecast to build to 
12 or 13 ft with this gap wind event. Please read the latest NWS 
High Seas Forecast issued by the National Hurricane Center at 
website https://www.nhc.noaa.gov/text/MIAHSFEP2.html for more 
details.

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

The monsoon trough axis extends from 09N83W to 07N95W to 10N114W
to 08N129W. The ITCZ continues from 08N129W to beyond 09N140W. 
Scattered moderate convection is noted within about 120 nm 
either side of the convergence zone axis in the following areas:
between 81W and 90W, between 90W and 97W, between 103W and 107W,
and between 114W and 128W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO... 

Gentle to moderate NW winds and seas in the 6-7 ft range prevail
across the offshore forecast waters of Baja California Norte and
N of Cabo San Lazaro. Fresh to strong winds will funnel through 
the Baja California Norte passes into the offshore waters through
Fri as strong high pressure builds over the Great Basin region. 
Strong northerly winds and building seas, with a maximum of 7 to
11 ft, are expected in the Gulf of California through Fri night.

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

Fresh to locally strong NE to E winds are expected in the Gulf 
of Papagayo over the next couple of days, particularly during 
the overnight and early morning hours. Elsewhwere, light to 
gentle winds are expected north of the monsoon trough, with 
moderate to fresh S to SW winds south of the trough axis, through
the upcoming weekend. 

REMAINDER OF THE AREA...

High pressure of 1026 mb located near 36N134W dominates the
northern forecast waters. The pressure gradient between the 
high and lower pressures in the vicinity of the ITCZ is 
supporting fresh trade winds from 09N to 20N west of 130W, and 
moderate to fresh winds elsewhere north of 10N and west of 120W. 
Seas are 8 to 12 ft  in NW swell across this area.

Large long period NW swell will propagate across most of the
waters N of the equator and W of 120W today, building seas to 
12-15 ft. Sea heights will diminish tonight and Fri as the area 
of swell propagates to the east-southeast and decays.

$$
GR