Eastern North Pacific Tropical Weather Discussion (Text)

AXPZ20 KNHC 240743

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Fri Nov 24 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 0600 UTC surface analysis and satellite imagery through
0900 UTC.


A gale warning remains in effect for Gulf of Tehuantepec. Minimal
gale force winds are noted across the Gulf of Tehuantepec and 
downstream to near 14N96W with seas of 12-13 ft. The most recent
scatterometer pass indicated that the fresh to strong N to NE 
winds extend farther south to near 12N97W. Winds are forecast to
diminish below gale force by mid-day today, and to 20 kt or less
late Sat morning. The NE swell generated by this gap wind event
is mixing with long-period cross equatorial swell, with seas 8 
ft or higher well downstream of the Gulf of Tehuantepec along 09N
between 94W and 100W. Expect winds of 20 kt or less and seas of
less than 8 ft only briefly on Sat afternoon. Strong N winds are 
forecast to resume again on Sat night, with gale conditions 
expected by mid-day Sun. Latest guidance is suggesting another 30
to 40 kt gap wind event on Sun night, with seas building to 16 
or 17 ft by early Mon morning. Gale conditions will persist on 


The monsoon trough extends from 09N84W to 08N90W to 07N101W. The
ITCZ continues from 07N101W to 11N117W to 10N130W to 09N135W to 
beyond 10N140W. Scattered moderate convection is occurring from 
08N to 10N between 130W and 133W. 



See Special Features paragraph above for information on the 
Gulf of Tehuantepec Gale Warning. 

A weak ridge dominates the offshore waters of Baja California
producing mainly light to gentle winds and seas of 3 to 4 ft. 
Seas will begin to build this afternoon in NW swell, and peak at
4 to 7 ft at 13 to 15 seconds across the waters W of Baja 
tonight, then subside some on Sat into Sun. Long-period NW swell
in the form of 7 to 9 ft seas will reach 30N120W by early Mon 
morning, and spread S across the offshore forecast waters W of 
Baja with 8 to 13 ft seas at 17 to 19 seconds Mon night and Tue.
Also on Monday, expect increasing winds of 20-25 kt across the
waters N of 26N, including the Sebatian Viscaino Bay as a stronger
high pressure builds across the northern forecast waters.

Gulf of California: Recent scatterometer pass indicated gentle to  
locally moderate winds across the entire Gulf. This flow will 
continue through tonight. The pressure gradient will relax 
further, with light and variable winds expected through Mon. 
Strong to near gale force NW flow is expected to develop across
the northern gulf on Mon night, with fresh to strong winds
spreading south across the central and southern parts of the gulf  
through Tue night, with seas building around 8 ft across the 
long fetch waters. 


Fresh to locally strong NE winds are forecast across the Gulf of
Papagayo during the overnight and early morning hours with the
assistance of the nocturnal drainage flow. Seas will build to
around 8 ft downstream of the gulf by early Mon morning. Moderate
to locally fresh NE winds are expected across the Gulf of Fonseca
on Mon. 

Light and variable winds, and 3 to 5 ft seas are expected 
elsewhere through Sun night to the N of the monsoon trough which 
has been meandering between 09N and 11N. Moderate southerly 
winds, and 3 to 6 ft seas, are forecast S of the monsoon trough.


A stationary front is near 30N140W. A broad surface low will 
develop along the front just W of the area by this evening. The 
low will move NE of the area tonight with the associated cold
front entering the forecast waters. The front is forecast to
reach from 30N136W to 22N140W tonight, and extend from 30N129W to
20N139W by Sat night. Fresh to strong southerly winds are expected
ahead of the front, but mainly N of 26N. A reinforning cold front 
will reach the far NW corner of the area by Sat morning followed
by fresh to strong NW winds and seas up to 10 or 11 ft. 

A pair of altimeter passes indicated seas of 10 to 14 ft from  
20N to 27N W of 134W while seas of 8 ft or greater in long period 
NW swell are propagating across the waters NW of a line from
30N123W to 14N140W. This swell event will beging to subside and 
shrink in area to mainly S of 15N and W of 125W by late Sat. At 
that time, another swell event will be reaching the NW waters.


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Page last modified: Friday, 24-Nov-2017 07:44:05 UTC