000
AXPZ20 KNHC 311600
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1516 UTC Wed Jan 31 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 1200 UTC surface analysis and satellite imagery through
1500 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: High pressure prevails over 
eastern Mexico maintaining 30-45 kt winds in Tehuantepec. The 
area of high pressure dominating the Gulf of Mexico will start to
shift eastward, loosening the pressure gradient. Winds will fall
below gale force early Thu. Please refer to the East Pacific 
High Seas Forecast under AWIPS/WMO headers HSFEP2/FZPN03 KNHC for
more details.

Looking ahead, another gale force wind event is possible Fri 
night into Sat. This next event will be much weaker and shorter 
duration than the current event. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

A surface trough extends from 06N77W to 05N90W. The ITCZ 
continues from 05N90W to 06N108W to 04N115W to 09N140W. 
Scattered moderate convection is from 06N to 09N between 103W 
and 106W.

...DISCUSSION...
 
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gulf of Tehuantepec: Please refer to the special features 
section above for more on the latest gap wind event. A broad 
wind field has generated a large area of 10 to 20 plus ft seas 
in northerly swell extending well away from the Gulf of
Tehuantepec.

Elsewhere over the open waters, seas are expected to remain at 
or below 6 ft through Sun as a tranquil pattern prevails. 

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

Fresh to near gale gap winds over the Gulf of Papagayo will
diminish to 20 to 25 kt today. These fresh to strong winds will 
then prevail through the remainder of the week. Elsewhere N of 
09N, gentle to moderate offshore flow will strengthen through 
Wed, except fresh to strong winds offshore of the Gulf of Panama 
through tonight. Gentle to moderate S to SW winds will prevail S 
of 09N the next few days.

REMAINDER OF THE AREA...

A mix of NE and NW swell continues over portions of the 
tradewind belt, with seas 8 ft or greater covering the waters 
west of a line from 14N140W to 10N130W to 01N140W, where seas 
are peaking near 9 ft. Seas will subside to 6-8 ft across the 
trade wind belt today, then below 8 ft for the end of the week. 
Large swell generated from the latest Gulf of Tehuantepec gap 
wind event will propagate across the waters S of 14N and E of 
115W, while gradually subsiding through the end of the week.

$$
Formosa