Tropical Weather Discussion
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000
AXPZ20 KNHC 300934
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
0930 UTC Sun Apr 30 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
0815 UTC.

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

A surface trough axis extends from 09N77W TO 10N90W TO 07N104W,
where The ITCZ begins and extends to 04N114W to 04N130W to
02N140W. Scattered moderate and isolated strong convection are
from 02N to 10N east of 91W. Scattered moderate convection is
elsewhere within 120 nm of either side of the trough and ITCZ
between 91W and 127W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Moderate northwest winds cover the waters west of Baja
California, with northwesterly swell of 6 to 8 ft. The swell will
diminish today, leaving the area with seas of 5 to 7 ft through
mid week.

Gulf of California: Strong northwest winds over the central Gulf
in the wake of a cold front will diminish through this morning.
Seas near 7 ft over the central Gulf waters will quickly subside
to 3 to 4 ft today. Gentle to moderate winds will prevail
elsewhere over the Gulf through the forecast period.

Gulf of Tehuantepec: Gentle to moderate southerly flow is
expected to continue through the remainder of this weekend with
fresh north winds possible near daybreak on Monday. A stronger
gap event is expected to begin on Friday, with gale force winds
possible late Friday and Friday night.

Elsewhere, mainly gentle to moderate winds will prevail with seas
primarily between 5 to 7 ft.

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

The combination of a surface trough and supper level diffluence
over the region supports clusters of thunderstorms across the
region, including over the coastal sections. This persistent
thunderstorm activity may cause localized flooding over prone
areas the next day or two. Mainly gentle winds are expected
during the next several days, becoming offshore along the coasts
at night. Long period southwest swell of 5 to 7 ft will persist
over the waters through early next week, possibly reaching 8 ft
offshore Ecuador by mid week.

REMAINDER OF THE AREA...

A 1032 mb high pressure system remains just north of the area
centered near 37N135W, with a ridge extending southeastward to
near 15N110W. This high pressure system covers the area north of
the ITCZ and west of 110W. Mainly moderate to fresh northeast
trades are expected between the ridge and the ITCZ the next
several days, with seas of 6 to 7 ft in mixed northeast and
southwest swell. Late this week, a cold front may bring strong
northwest winds to the northern waters. Southern hemispheric
SW swell will propagate across the waters south of 05N between
95W and 125W tonight and Monday, resulting in seas to 8 ft.
Additional southern hemispheric swell to 8 ft will pass north of
the Equator between 90W and 110W on Wednesday.

$$
LATTO



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