863 
AXPZ20 KNHC 230932
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
907 UTC Thu Aug 23 2018

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
0930 UTC. 

...TROPICAL WAVES...

A tropical wave extends N of 04N along 86W northward into the
western Caribbean Sea moving W at around 15 kt. Associated
convection is described in the Monsoon Trough section below.

A tropical wave from 04N to 18N along 115W is moving W around 15
kt. Associated convection is described in the Monsoon Trough 
section below.

A tropical wave from 04N128W to 1012 mb low pressure near 
13N130W is moving W around 10 to 15 kt. Associated convection is
described in the Monsoon Trough section below.
   
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends from 10N85W to 08N100W to low 
pressure near 13N130W. Scattered moderate and isolated strong 
convection is evident from 06N to 08N between 87W and 95W, and 
within 120 nm south of the monsoon trough from 110W and 120W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO... 

In the Gulf of Tehuantepec, fresh to strong northerly winds and
seas to 9 ft persist this morning due to a tight pressure 
gradient between high pressure north of the area and lowering 
pressure farther south in the tropics. These gap winds and
related seas will gradually diminish through early Fri.

Elsewhere, ridging across the waters north of 20N will support
moderate to occasionally fresh winds funneling along the coast 
of Baja California through the next several days, with 3 to 5 ft 
seas, with the highest seas off Baja California Norte. Gentle to
moderate southerly flow will persist over the Gulf of 
California.

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

The monsoon trough will linger between 08N to 12N during the 
next few days. Winds on both sides of the trough axis will 
generally be light to moderate. The main exception to this will 
be over the Gulf of Papagayo, where moderate to fresh offshore 
winds will pulse at night. Seas are expected to remain less than 
8 ft downstream of Papagayo with the winds.

REMAINDER OF THE AREA...   

Elsewhere, the pressure gradient between ridging across the 
northern waters and the monsoon trough will support gentle to 
moderate trades and 4 to 7 ft seas in mixed swell north of the 
monsoon trough and west of 120W through the weekend.

Seas are reaching 8 ft in a small area from 15N to 20N west of
135W, mainly due to a mix of NE and SE swell. This will persist
through much of today then subside. Elsewhere, sea heights will 
be relatively low for most of the forecast area this week. Robust
long period swell could arrive from the Southern Hemisphere 
toward the end of this week and cause seas near the Equator to 
begin building over the weekend.
  
$$
Christensen