000
AXPZ20 KNHC 050900
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
456 UTC Wed Apr 5 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 will shift across the Gulf of Mexico today. High
pressure building in the wake of the front will help usher in the
next Gulf of Tehuantepec gale force gap wind event. Winds will
strengthen this evening and rapidly increase to gale force by
early Thursday morning. The northerly winds will continue to 
strengthen Thursday. Winds will increase to 40 kt, and seas will  
build to 15 ft, just downstream of the Gulf of Tehuantepec on
Thursday night. Winds may 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 04N95W to 03N106W to 05N123W to 00N140W. 
Scattered moderate isolated strong convection is noted within 120
nm north of the ITCZ between 119W and 125W.

...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 on Sunday.

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

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

Gulf of Papagayo: High pressure building north of the area will
help increase nocturnal pulsing of winds over the Gulf of
Papagayo starting late tonight. 
 
Gulf of Panama: Moderate to fresh nocturnal flow is expected 
during the overnight hours this week.
  
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. 
Seas associated to the latest northwesterly swell train have been
subsiding, with seas 8 ft or greater only a covering small area 
from 04N to 14N between 108W and 123W. Seas will subside below 8 
ft over this area tonight. A fresh set of northwesterly swell 
will reach the northwest waters this morning. Seas associated to 
this swell will peak near 11 ft today. Yet another set of 
northwesterly swell will propagate into the northwest waters late
Thursday. This swell will peak near 15 ft late Friday night.

$$
AL