000
AXPZ20 KNHC 310302
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
149 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 0000 UTC surface analysis and satellite imagery through
0300 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Storm Warning: High pressure prevails over
eastern Mexico maintaining the storm force in Tehuantepec. The 
area of high pressure dominating the Gulf of Mexico will start to
shift eastward overnight, loosening the pressure gradient. Winds
will diminish to gale force Wed, and 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 04N97W to 08N124W to 08N140W. Scattered
moderate isolated strong convection was noted within 240 nm north
of the ITCZ between 104W and 110W. Scattered moderate convection was
noted within 120 nm either side of the ITCZ between 132W and 137W.

...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 strong gap winds will increase to near gale
force late tonight into early Wed over the Gulf of Papagayo. 
Elsewhere N of 09N, gentle to moderate offshore flow will 
strengthen through Wed, except pulsing to fresh to strong 
offshore of the Gulf of Panama and near the Azuero Peninsula
through Wed night. 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 18N140W to 09N124W to 00N132W, where seas are
peaking near 10 ft. Seas will gradually subside to 6-8 ft across
the trade wind belt Wednesday, 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 120W, while gradually subsiding through the end of 
the week.

$$
AL