000
AXPZ20 KNHC 270320
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0405 UTC Tue Dec 27 2016

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 Gale Warning...High pressure building north
of the area in the SW Gulf of Mexico on Tuesday will tighten the
gradient over the Isthmus of Tehuantepec, and strong winds will
funnel through Chivela pass into the Gulf of Tehuantepec. Gap
winds will strengthen overnight and increase to minimal gale
force Tuesday evening. Pulsing 30-40 kt gales are expected to
continue through Friday night. This persistent high wind event
will create a plume of 8 to 12 ft seas extending several hundred
miles from shore. Please see latest National Hurricane Center
high seas forecast MIAHSFEP2/FZPN03 KNHC for further details.

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

The monsoon trough extends from 07N78W to 10N86W to 07N95W. The
ITCZ axis continues from 07N95W to 09N118W to 07N140W. Scattered
moderate convection noted from 08N to 12N between 123W and 128W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Please see special features for more on the Gulf of Tehuantepec
gale force wind event. Elsewhere fresh to strong northwest winds
will develop in the Gulf of California overnight, then continue
through much of the week. Northwesterly swell off the coast of
Baja California will subside to 6-7 ft overnight. A low pressure
system and a trailing cold front west of Baja California will
stall, weaken and gradually dissipate through Wednesday.
  
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...

Fresh to strong gap winds will develop in the Gulf of Papagayo
tonight as high pressure builds north of the area and tightens
the pressure gradient over Central America. Elsewhere, winds
will remain 20 kt or less, with seas below 8 ft through early
next week.

REMAINDER OF THE AREA...

A cold front extends from a 1015 mb low centered near 31N124W to
30N121W to 27N122W to 23N131W. Scatterometer data shows fresh to
strong northerly winds north of the front. Northwest swell with
seas of 8 to 12 ft associated with the front is propagating into
the area. The low will drift south of 30N overnight, then stall
and gradually weaken into a trough near 28N122W Wednesday. High
pressure building behind the front will support fresh to strong
trade winds north of the ITCZ to 20N, and west of 125W through
Wednesday night.

$$
Mundell