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Eastern North Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 262100
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1915 UTC Tue Sep 26 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 1800 UTC surface analysis and satellite imagery through
2100 UTC.

..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...         

The monsoon trough extends from low pressure south of the Gulf 
of Tehuantepec near 15N94W, to 11N106W to 15N116W to low 
pressure near 13N123W to beyond 11N140W. Scattered moderate  
isolated strong convection is noted north of 11N between 92W and
97W. Scattered moderate isolated strong convection is noted
within 90 nm of the monsoon trough between 115W and 127W. 

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  

The remnant low pressure of Pilar just off the southern tip of
Baja California Sur, with mainly moderate winds south of the low.
The low may linger for another day over the southern Gulf of 
California before dissipating. Low pressure south of the Gulf of
Tehuantepec is producing strong winds over the southern quadrant
of the low, with associated active convection as noted in the 
monsoon trough section above. This area of low pressure is
expected to persist south of the Gulf of Tehuantepec through 
late week. Elsewhere, a weak pressure pattern over the Mexican 
offshore waters north of 20N will promote gentle to moderate 
breezes through late week. Strong high pressure building over 
the Gulf of Mexico north of the area will produce a pulse of 
fresh to strong gap winds into the Gulf of Tehuantepec Fri night 
into early Sat.

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

An active monsoon trough along and inland of the coasts of 
Central America from Guatemala to Panama will produce active 
convection over the coastal waters the next few days. Moderate 
SW to W winds are expected south of the trough through Sun. Long
period SE to S swell will maintain 5 to 6 ft seas west of 
Ecuador and south of the Equator during the next few days.

REMAINDER OF THE AREA...

Strong winds are noted within 120 nm southeast and 60 nm
northwest semicircles of low pressure embedded within the 
monsoon trough near 13N123W. Active convection associated to this
low is noted in the monsoon trough section above. Monsoonal SW 
winds will remain fresh to strong across this general area 
through mid week, before diminishing.

Otherwise, high pressure of 1024 mb, centered well N of the area
near 39N136W, extends a ridge southwest to near 23N120W. The 
pressure gradient between this area of high pressure and the 
monsoon trough is producing mainly light to moderate trade winds 
W of 120W.

$$
AL

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Page last modified: Tuesday, 26-Sep-2017 21:01:18 UTC