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Eastern North Pacific Tropical Weather Discussion

AXPZ20 KNHC 231523

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1310 UTC Thu May 23 2019

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.

The monsoon trough extends across Central America to a 1009 
located over Nicaragua near 12N86W to 11N100W to 08N120W. The 
ITCZ continues from 08N120W to beyond 06N140W. Scattered moderate
to strong convection is noted from 09.5N to 13.5N between 85W 
and 90W, and from 07N to 11N between 92W and 98W. Numerous 
moderate and scattered strong convection is seen from 08N to 13N 
between 98W and 102W.



The pressure gradient between a ridge across the offshore
forecast waters of Baja California and lower pressure over the 
SW CONUS and northern Mexico is supporting moderate to fresh NW 
winds off the west coast of Baja California and N of Punta 
Eugenia. NW swell associated with stronger winds off the coast of
California continues to support seas of 8 to 13 ft north of Cabo
San Lazaro, with the highest seas covering the waters N of 27N 
between 116W and 125W. Winds are forecast to diminish to a gentle
to moderate breeze later today while seas will gradually subside
to near 8 ft across the offshore waters W of 110W on Fri.

Gulf of California: Winds have diminished across the northern
Gulf this morning. Looking ahead, winds will increase again to
20 to 25 by Sat night ahead of a cold front approaching the 
region. Then, moderate to fresh SW winds will persist through

Gulf of Tehuantepec: Fresh to strong northerly winds will pulse 
across the Gulf region early Sat morning, and again early Sun
morning with the assistance of the nocturnal drainage flow. Seas
will build to 8 ft with these short-lived gap wind events. 


Disorganized showers and thunderstorms along portions of the west
coast of Central America and the far eastern North Pacific are
associated with a broad area of low pressure. Earlier satellite wind
data indicated that the large circulation has moved inland over
Central America and the chance for development has decreased.
Regardless of development, locally heavy rains are likely to
continue over portions of Central America as this system remains
nearly stationary during the next few days. These rains could cause
flash flooding and mudslides in areas of mountainous terrain. The
Weather Service in Nicaragua has reported locally heavy rain
during the last 24 hours ending at 7am this morning.

Otherwise, the monsoon trough will dominate the regional pattern 
into early next week. Expect generally light to gentle winds 
north of the monsoon trough and moderate to fresh S to SW winds 
south of the monsoon trough through the weekend. Early next 
week, the global models suggest increasing winds south of the
monsoon trough likely associated with a very broad area of low
pressure over Central America and the SW Caribbean Sea. The 
increasing winds will depend on how the low pressure system 
described above evolves in the coming days. Seas generally will 
run 8 ft or less into the weekend, then build into early next 
week in response to the strengthening monsoon flow. This 
weather pattern is common in this area for this time of the 


Northwest swell over the waters north of 20N between 110W and 
135W is producing seas ranging from 8 to 13 ft across the region
with the highest seas N of 27N between 116W and 125W. This swell
event will gradually decay by Fri, with seas falling below 8 ft 
Fri night into Sat.

A high pressure ridge extends from a 1033 mb high near 37N139W 
east-southeastward to near the Revillagigedo Islands. The 
pressure gradient between the ridge and lower pressures in the
vicinity of the ITCZ is maintaining fresh to locally strong  
trades over the waters west of 135W with seas up to 10 ft based
on altimeter data.

Elsewhere, a small area of 8 ft seas in SW swell persists 
roughly from 05N to 09N between 103W and 111W. Additional 
pulses of cross- equatorial SW swell will result in 8 ft seas 
developing over the waters S of 08N between 96W and 115W on Fri.
Another and stronger SW swell event is expected early on Sun 
through early next week, reaching the coast of Mexico and Central
America Mon night into Tue.