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Eastern North Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 232043
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 UTC Mon Nov 23 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 1800 UTC surface analysis and satellite imagery through
2040 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: The pressure gradient between 
a high pressure ridge over the eastern slopes of the Sierra Madre
Oriental and the eastern Pacific monsoon trough continues to 
support minimal gale force northerly winds across the Tehuantepec
region tonight. Fresh to strong N to NE winds extend well 
offshore from Tehuantepec to near 12N100W. Peak seas to 14 ft 
prevail downwind of the Gulf. Associated seas to 8 ft and greater
extend downwind of the outer edge of the offshore waters near 
10N100W. Gale force winds are expected to last through early Tue.
Winds will diminish to 20 kt or less and seas will subside to 
less than 8 ft by Tue night. Please read the latest NWS High Seas
Forecast issued by the National Hurricane Center at website 
https://www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details.

...TROPICAL WAVES...

The axis of a tropical wave is near 90W N of 05N, moving west at
10 to 15 kt. Scattered moderate convection is from 08N to 12N 
between 88W and 92W.

The axis of a tropical wave is near 118W, from 03N to 19N, 
moving west at 15 kt. A 1008 mb low pressure center associated 
with this wave is located near 10N118W. Scattered moderate to 
strong convection is noted from 08N to 17N between 113W and 
120W.

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

The monsoon trough extends from 10N85W to 10N90W to 07N100W to 
12N117W to 08N127W. The ITCZ continues from 08N127W to beyond 
07N140W. Scattered moderate convection is from 08N to 12N 
between 88W and 92W. Scattered moderate isolated strong
convection is noted from 10N to 15N between 101W and 108W. Scattered
moderate to strong convection is noted from 08N to 17N between 
113W and 120W. Scattered moderate isolated strong convection is 
noted from 08N to 11N between 120W and 140W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A Gale Warning remains in effect for the Gulf of Tehuantepec. 
Please see the Special Features section above for details.

A broad ridge extends SE across the Baja California offshore 
waters. The pressure gradient between this area of high pressure 
and a surface trough along the Gulf of California is supporting 
generally gentle to moderate northerly winds across the waters 
off the coast of Baja California. Light to gentle winds prevail 
elsewhere south of 23N. Wave heights are 4-6 ft in long-period 
northwest swell across the offshore waters, except to 7 ft across
the far northern waters. 

Strong northerly winds have developed off the California coast. 
Fresh winds will spread into the northern waters of Baja 
California Norte tonight. This will usher in increasing 
northerly swell that will raise wave heights across the Baja 
waters to 6-9 ft. Large NW swell will move into the Baja offshore
waters Wed night, with seas 8 ft or greater spreading southward 
across the Baja California waters through Fri night. Seas 
associated to this swell will peak at 12-15 ft off off Baja 
California Norte late Thu afternoon into Fri morning. Fresh to 
strong northerly winds will then spread southward across the Gulf
of California Thu night through Sat across the Gulf of 
California.

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

Gentle to moderate south to southwest winds prevail south of 10N,
with gentle northeast winds north of 10N. Wave heights are 
generally 5-6 ft in mixed south to southwest swell. Winds and 
seas will diminish slightly south of 10N through Tue, then 
increase modesty Wed. Moderate NE to E winds will pulse to fresh 
each night over the Papagayo region through Thu night.

REMAINDER OF THE AREA...

A broad ridge dominates the waters north of 20N and west of 
115W. The pressure gradient between the ridge and lower pressure 
within the monsoon trough and in the vicinity of the ITCZ is 
producing fresh to locally strong tradewinds across the area 
waters from 08N to 25N west of 125W. Seas are generally 7-10 ft 
across this area. These conditions will change little through 
Wed.

Fresh NW swell has propagated into the far NW waters, with seas 
to 8 ft and will spread southeastward through mid week to
maintain seas near 8 ft across the northern waters north of 26N. 
Large NW swell will move into the northern waters late Wed. Seas
will peak 10-16 ft over the northern waters N of 20N and E of 
130W early Thu into Fri.

$$
AL

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Page last modified: Monday, 23-Nov-2020 20:43:31 UTC