000
AXPZ20 KNHC 060903
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
515 UTC Thu Apr 6 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 FEATURE...

GULF OF TEHUANTEPEC GALE WARNING...

A cold front moving across the Gulf of Mexico has reached the Bay
of Campeche. High pressure building in the wake of the front is
ridging across eastern Mexico. Winds behind the front have
started to funnel through the Chivela pass into the Gulf of 
Tehuantepec. Winds will rapidly increase to gale force by early 
this morning. The northerly winds will continue to strengthen 
Today. Winds will increase to 40 kt, and seas will build to 15 
ft, just downstream of the Gulf of Tehuantepec by tonight. Winds
will briefly diminish to just below gale force briefly late Fri 
morning, but will once again increase to minimal gale force on 
Fri evening. Winds will diminish below gale force Saturday, and 
continue to diminish to 20 kt or less by Sunday morning.
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...  

The ITCZ extends from 06N105W to 01N116W to 04N126W to 02N140W. 
No significant convection associated to the ITCZ.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

See special features above for more on the upcoming Gulf of 
Tehuantepec gale force gap wind event.

High pressure centered west of the area extends a ridge eastward
to near the Revillagigedo Islands. Outside of the Gulf of 
Tehuantepec region, gentle to moderate northwest to north flow 
will prevail across the offshore waters. Winds will strengthen 
over the offshore waters off the west coast of Baja California 
Norte early on Sunday.

Gulf of California: Gentle to moderate northwest winds will
prevail today before weakening slightly on Friday.

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

Gulf of Papagayo: winds will pulse to fresh to strong during the
late night and early morning hours each night through Sunday
night. 
 
Gulf of Panama: Moderate to fresh nocturnal flow is expected 
during the overnight hours each night through the weekend.
  
Elsewhere, light to gentle winds, and combined seas of 3 to 5 
ft, will prevail. 

REMAINDER OF THE AREA...

The pressure gradient between high pressure over the northern
waters and lower pressure in the vicinity of the ITCZ is 
supporting gentle to moderate trades over the tradewind belt. 
Northwesterly swell is propagating through the northwest waters,
with seas in the 8 to 10 ft range northwest of a line from 
30N130W to 27N140W. Yet another set of northwesterly swell will 
propagate into the northwest waters late today. This swell will 
peak near 13 ft late tonight.

$$
AL