000
AXPZ20 KNHC 060928
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Wed Sep 6 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.
  
...TROPICAL WAVES AND TROPICAL LOWS...

A tropical wave is analyzed along 122W from 10N to 21N, moving W 
at 15 kt. No significant convection is associated with the wave 
at this time.

A 1010 mb surface low is embedded within the monsoon trough near 
12N130W. No significant convection is associated with the low at 
this time.

INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends from 09N84W to 16N117W to a 1010 mb 
low near 12N130W to 09N135W. The ITCZ continues from 09N135W to 
beyond 07N140W. Scattered moderate isolated strong convection is 
situated well south of the trough axis from 07N to 09N between 
93W and 96W, and also from 09N to 11N between 106W and 117W.
  
...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A weak ridge extends along 27N into the area. Moderate NW winds 
are expected W of the Baja California Peninsula overnight. The 
pressure gradient will tighten Wed, resulting in a band of fresh 
to locally strong NW winds and 6 to 8 ft seas N of 29N within 60 
nm of the W coast of the Baja Peninsula, through early Thu.

Gulf of California...Light southerly winds are expected across 
the Gulf of California through early Fri, then increasing to a 
moderate breeze through the weekend.

Gulf of Tehuantepec: Moderate nocturnal northerly flow is 
expected through Thu night. A gap wind event is expected to 
begin on Sat night.
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR...

Gulf of Papagayo: A light nocturnal offshore breeze is expected 
through the period. 
    
Light and variable flow is expected N of the monsoon trough 
early Fri, then the pressure gradient will tighten with fresh 
monsoonal flow from the equator to along 08N, with seas building 
to 6 to 8 ft. 

REMAINDER OF THE AREA...

A weak high is centered near 27N137W, and a surface trough is 
evident from satellite imagery from 28N131W to 24N132W. The 
gradient between the high and lower pressure associated with the 
monsoon trough will maintain gentle to moderate trades N of the 
monsoon trough W of 120W, with seas 4 to 6 ft through Friday. 
  
Fresh monsoonal flow will develop late Fri N of the Equator to 
along 08N east of 120W, with seas building to 6 to 8 ft. 

$$

Mundell