000
AXPZ20 KNHC 090944
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
943 UTC Sun Apr 9 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...

Northeast Pacific Gale Warning...A cold front accompanying a low
pressure system will move into the discussion waters Mon night
through Tue night. A gale warning is in effect for the waters N
of 30N ahead of the front with building seas of 8-16 ft.
 
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...  

A surface trough axis extends from 08N86W to 03N95W to 03N123W.
Widely scattered moderate and isolated strong convection is
within an area bounded by 05N84W to 07N89W to 04N96W to 02N91W 
to 00N86W to 05N86W, and also from 01N to 03N between 99W and 
106W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

High pressure is building in across the region in the wake of a
dissipated cold front. The pressure gradient is tight enough to
support fresh to strong NW flow across the offshore waters W of
the Baja California Peninsula. These winds will diminish tonight
as the pressure gradient slackens, then will return by the middle
of the week as the gradient tightens again. Seas in fresh NW
swell of 8-11 ft will gradually subside during the early part of
the week, with a new set of fresh NW swell arriving by the middle
of the week.

In the Gulf of California, moderate to fresh NW flow in the
northern portion behind the dissipated cold front will spread SE
across the Gulf through the afternoon, with moderate NW flow then
expected Mon and Mon night. Light to gentle NW flow will prevail
through Wed, then will become light and variable thereafter.

In the Gulf of Tehuantepec, recent scatterometer data showed a
small area of fresh to strong nocturnal northerly flow, although
these winds are diminishing. The next surge of fresh to strong 
northerly winds is forecast to begin by early Wed and continue 
through the end of the week, with near gale force conditions 
possible Wed night into early Thu. Seas will build to 8-11 ft
with this next gap wind event.

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

In the Gulf of Papagayo, fresh to locally strong nocturnal 
drainage winds will diminish by the afternoon, with mainly fresh
nocturnal flow expected thereafter until Wed night through Thu
night as winds will pulse back to fresh to strong.

In the Gulf of Panama, moderate to fresh nocturnal northerly 
flow expected during the overnight hours through the end of the
week.
  
Elsewhere, light to gentle winds, and combined seas of 3-5 ft
prevail.

REMAINDER OF THE AREA...

High pressure continues to build in across the waters N of the
ITCZ in the wake of a dissipated cold front, with moderate to
fresh winds around ridging which extends from a 1026 mb high near
32N131W to 13N105W, and light to gentle winds in the NW corner of
the area closest to the high center. Mainly NW swell of 6-9 ft
prevails across the area W of 105W.

Another batch of NW swell, in the form of 7-10 ft seas, will 
propagate into the far NW portion by early Mon ahead of a cold 
front reaching from 32N138W to 29N140W late Mon night as 
mentioned in the special features section above. This set of NW 
swell will decay through Tue night with a new set arriving Wed 
night through Thu night.

$$
LEWITSKY