000
AXPZ20 KNHC 171004
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Tue Dec 17 2019

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 
0845 UTC.

...SPECIAL FEATURES...

Gulf of Tehuantepec Storm Warning: a strong cold front over the 
northwestern Gulf of Mexico will continue to move SE across the 
basin. High pressure building southward across the Sierra Madre 
Oriental in the wake of the front will support the next gale 
force gap wind event starting tonight across the Gulf of 
Tehuantepec. Winds will further increase and reach minimal storm 
force by Wed morning with seas to 22 ft. Storm conditions will 
prevail through early Thu while gale conditions are expected to 
continue through the weekend.

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

The monsoon trough extends from 06N77W to 07N93W. The ITCZ 
continues from 07N93W to 09N103W to 08N113W to 06N140W. 
Scattered moderate isolated strong convection is noted from 03N 
to 08N E of 81W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Please see the Special Features section above for details on a 
gap wind event with winds reaching storm force by Wed morning 
over the Gulf of Tehuantepec.

Strong high pressure over the Great Basin region is supporting 
fresh to strong force NW winds across the Gulf of California, 
and moderate to fresh NE winds across the Baja California Norte 
mountain passages and offshores. This is supporting seas to 9 ft 
over the offshores N of Punta Abreojos.  

Winds across the Gulf of California will increase to near gale 
force today, then will gradually decrease to 20 kt or less by 
Wed morning. A fresh set of NW swell will propagate into the 
waters off Baja California Norte Wed evening and propagate SE to 
near the Revillagigedo Islands through the upcoming weekend. 
Seas will build to near 10 ft off Baja California Norte with 
this new set of NW swell.

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

Moderate to fresh winds are expected across the Gulf of 
Papagayo, increasing to fresh to strong Wed, and continuing 
through the upcoming weekend. Elsewhere, gentle to moderate 
south to southwest monsoon flow will persist across the offshore 
waters of Costa Rica, Panama, Colombia, and Ecuador, while light 
to gentle flow will dominate across the Gulf of Panama. 

REMAINDER OF THE AREA...

Surface ridging prevails across the waters N of 16N W of 110W 
and continue to support moderate to fresh trade winds N of the 
ITCZ to near 23N. Subsiding NW swell continues across the 
forecast waters with seas to 10 ft. However, a cold front over 
the NW forecast waters is bringing with it a new set of large NW 
swell with seas building to 13 ft N of 28N tonight. The front 
will gradually weaken and extend from 30N118W to 23N131W Wed 
night before dissipating.  

$$
Ramos