000
AXPZ20 KNHC 060220
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
120 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 0000 UTC surface analysis and satellite imagery through
0215 UTC.
  
...TROPICAL WAVES AND TROPICAL LOWS...

A tropical wave is analyzed from 21N120W TO 10N121W, and has 
been moving W at 15 kt over the past 24 hours. A band of 
scattered moderate convection is observed from 15N-18N and east 
of the wave's axis extending from 112W-120W.

A 1010 mb surface low is embedded within the monsoon trough at 
11N130W. Scattered moderate convection is observed within the low
from 09N-13 between 130W AND 134W. 

INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends W across the SW Caribbean along 10N 
to the Pacific coast of Costa Rica at 11N86W, then continues W 
to 17N117W to the 1010 mb low near 11N130W to beyond 10.5N140W. 
Aside from the convection related to the tropical wave along 121W
and the low, scattered moderate convection is noted within 200 
nm south of the axis between 85W-110W. 
 
...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A NW to SE orientated ridge extends into the area from 28N130W 
to 22N115W. A moderate NW breeze is forecast across the EPAC 
waters W of the Baja California Peninsula tonight. The pressure 
gradient will tighten resulting in a band of fresh to locally 
strong NW winds and 6 to 8 ft seas, to the N of 29N within 60 nm 
of the W coast of the Baja Peninsula, with little change 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 event is expected to begin on 
Fri night.
 
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR...

Gulf of Papagayo: A light offshore breeze is expected during the
overnight hours 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, with a ridge extending SE 
to 22N115W. The pressure gradient between the high and lower 
pressure associated with the monsoon trough will maintain gentle 
to moderate trades N of the monsoon trough and W of 120W, with 
seas remaining 4 to 6 ft through Friday. 
  
Fresh monsoonal flow will develop late Fri N of the Equator to 
along 08N all to the E of 120W, with seas building to 6 to 8 ft. 

$$

ERA