000
AXPZ20 KNHC 291556
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1605 UTC Sun Nov 29 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 Tehuantepec Gale Warning: The next gap wind event over 
the Gulf of Tehuantepec is expected to commence late tonight into
early Mon morning as high pressure builds across the western 
Gulf of Mexico and the eastern slopes of the Sierra Madre 
Mountains in the wake of a strong cold front moving across the 
Gulf of Mexico. Winds will rapidly increase to strong gale force 
by Mon afternoon and reach 40-45 kt by Mon evening. Seas will 
peak near 20-21 ft by Mon night. Marine interest transiting 
across or in the vicinity of the Gulf of Tehunatepec should be 
aware of this upcoming 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 
https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details.

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

The monsoon trough extends from a 1010 mb low pressure over
northern Colombia near 10N75W to 07N80W to 08N94W to 06N110W to 
09N127W. The ITCZ continues from 09N127W to beyond 07N140W. 
Scattered moderate convection is noted from 07N to 10N between 
90W and 100W. 

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

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

A ridge prevails across the offshore waters of Baja California, 
anchored by high pressure of 1025 mb centered near 38N128W. This
system is producing gentle to moderate NW-N winds. Seas are in
the 5-7 ft range. Long period NW swell will reach the waters N of
Punta Eugenia by Tue building seas to 8-10 ft by Tue night.

Strong high pressure over the Great Basin of U.S. supports fresh
to strong NW winds in the Gulf of California with seas of 4-6 
ft. These marine conditions are expected to persist trough Mon
morning.

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

Fresh to strong NE to E winds are expected in the Gulf of
Papagayo Mon night through Wed morning with seas building to 8
ft. Seas generated by a strong gap wind event in the Gulf of
Tehuantepec will propagate across the offshore waters of
Guatemala and El Salvador Mon night through Tue night. Moderate
S to SW winds are expected elsewhere south of 10N. 

REMAINDER OF THE AREA...

A ridge dominates the northern forecast waters and extends SE to
near the Revillagigedo Islands. The pressure gradient between 
the ridge and lower pressure within the monsoon trough, and in 
the vicinity of the ITCZ, is supporting moderate to fresh trade 
winds north of 10N and west of 120W. Seas are generally 6-8 ft 
across this area. The large NW swell across the area continues to
subside today, and will slowly decay through Monday. Another 
pulse of NW swell is forecast to reach 30N140W early Mon, with 
larger NW swell moving southeast into the area Thu.

$$
GR