000
AXPZ20 KNHC 270940
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Wed Dec 27 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 0600 UTC surface analysis and satellite imagery through 
0900 UTC.

..SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: Scatterometer data and surface 
observations from Salina Cruz Mexico show winds have subsided 
below gale force. Model guidance indicates that building high 
pressure over the western Gulf of Mexico and eastern Mexico will 
once again induce gale force northerly winds through the Chivela 
Pass into the Gulf of Tehuantepec tonight, and continue through 
Fri morning. Peak seas should reach about 13-14 ft early Friday. 
Refer to the latest high seas forecast issued under AWIPS/WMO 
headers HSFEP2/FZPN03 for more details.

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

A surface trough axis extends from 05N79W to 07N87W to 08N110W. 
The ITCZ axis continues from 08N110W to 10N120W to 08N140W. 
Scattered moderate convection is within 45 nm of the trough axis 
between 94W and 108W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Please refer to the special features section above for details 
of a Gulf of Tehuantepec Gale event. A fairly static synoptic 
pattern associated with a nearly stationary subtropical high 
west of California and a surface ridge extending SE from the 
high will persist for several days, and gentle to moderate NW to 
N winds are expected west of Mexico through the weekend. Seas 
will be generally 4-6 ft in offshore waters and 2-4 ft in the 
Gulf of California.

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

Moderate high pressure gradient in the western Caribbean will 
continue to support fresh to strong NE winds from 09N to 11N 
east of 90W, including the Gulf of Papagayo, through Sun night 
with seas to 7-9 ft primarily from NE wind waves. Mainly gentle 
winds are expected elsewhere through Thu, with offshore seas 
generally 4-5 ft.

REMAINDER OF THE AREA...

Long-period NW swell is producing 8-10 ft seas north of 17N and 
west of 127Wt. Seas will continue to gradually diminish today as 
the peak swell continues moving SE. A mid-level trough extending 
from a cyclonic circulation aloft near 22N119W to 10N125W is 
supporting widespread deep layer cloudiness and embedded showers 
over a large area centered near 15N110W. The upper trough will 
continue to promote scattered convection during the next couple 
of days in the same general location.

$$
Mundell