000
AXPZ20 KNHC 062138
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2105 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 1800 UTC surface analysis and satellite imagery through
2045 UTC.

INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends from 09N86W to 16N105W then resumes
from 15N112W to a 1012 mb low near 12N132W to 10N136W. ITCZ from
10N136W to beyond 10N140W. Numerous moderate convection is within
100 nm south of the monsoon trough 78W-93W. Scattered moderate
convection is observed within 200 nm south of the remainder of
the monsoon trough and the ITCZ. 
  
...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A weak surface ridge with 1019 mb high center near 26N137W 
covers the NW forecast area and extends E to Baja California 
adjacent waters. An elongated area of low pressure prevails along
the Baja California waters. The pressure gradient between these 
two features currently supports moderate NW winds W of the Baja 
California Peninsula north of 26N E of 120W. The pressure will 
slightly increase tonight, resulting in a tighter gradient, thus 
fresh to locally strong NW winds and 6 ft seas in this area
lasting through early Thu. Moderate NW winds will then continue 
through Fri morning.

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

Gulf of Tehuantepec: A gap wind event with fresh to strong winds 
and seas to 8 ft is forecast from Sat night through Sun morning. 
Winds will pulse again at night on Sun night.  

OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR...
    
Light and variable flow is expected N of the monsoon trough Sat 
night, then the pressure gradient will tighten with fresh 
monsoonal flow from the equator to along 09N, with seas building 
from 6 to 8 ft. 

REMAINDER OF THE AREA...

A weak surface ridge with 1019 mb high center near 26N137W 
covers the NW forecast area and extends S to near 15N. 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 of 4 to 6 ft through Fri. 
  
Fresh monsoonal flow will develop Fri morning N of the Equator 
to along 10N east of 125W, with seas building to 8 ft through 
Sat night. 

$$

ERA