000
AXPZ20 KNHC 270225
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0200 UTC Wed Sep 27 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 0000 UTC surface analysis and satellite imagery through
0220 UTC.

..INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...         

The monsoon trough extends from 16N93W to low pressure south of 
the Gulf of Tehuantepec near 15N95W, to 12N104W to 15N118W to 
low pressure near 13N123W to 11N130W to beyond 11N140W. Scattered
moderate isolated strong convection was noted north of 09N
between 85W and 90W. Scattered moderate convection is noted
within 120 nm south of the monsoon trough between 93W and 105W. 
Scattered moderate isolated strong convection is noted within 90 
nm south and 30 nm north of the monsoon trough between 115W and 
130W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...  

The remnant low pressure of Pilar is 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 this area before 
dissipating. Low pressure south of the Gulf of Tehuantepec is 
producing fresh 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 centered N of the area extends a ridge 
southwest to near 22N120W. 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