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Eastern North Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 182109
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2035 UTC Mon Dec 18 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 1800 UTC surface analysis and satellite imagery through
2100 UTC.

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

The ITCZ extends from 06N93W to low pres near 09N109W to 09N130W
to 09N140W. Scattered moderate isolated strong convection is 
noted from 08N to 10N between 106W and 112W. Scattered moderate 
convection is noted from 07N to 10N between 125W and 129W, and
from 08N to 10N between 136W and 139W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

In the Gulf of California, Northerly winds will increase to 
strong to near Gale force behind the next cold front early Thu 
through Fri with seas building to 8 ft. These strong winds are 
also forecast to seep through Baja California passages into the 
open Pacific waters W of the peninsula.

In the Gulf of Tehuantepec, northerly winds will pulse to fresh 
to strong mainly during the overnight and early morning hours 
with seas occasionally building to 8 ft the next couple of 
nights.

Elsewhere across the offshore waters of Mexico, gentle to
moderate mainly NW winds prevail. NW swell of 7-10 ft W of the 
Baja California Peninsula will continue to subside through 
tonight, with 4-6 ft seas elsewhere. A fresh pulse of NW swell 
will propagate into the waters off the coast of Baja California 
Norte Thu behind the next cold front, with seas building to near
9 ft.

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

Fresh to strong NE winds will pulse mainly at night offshore of 
Gulf of Papagayo through Fri. Fresh N winds over the Gulf of 
Panama will pulse again tonight.

Elsewhere, mainly gentle NE-E winds will prevail N of 09N, and 
moderate SW flow S of 09N.

REMAINDER OF THE AREA...

Northerly swell of 7-10 ft N of 20N continues to subside and will
be less than 8 ft by early Wed. 

Mainly moderate winds prevail elsewhere over the forecast waters
N of the ITCZ to 20N and W of 125W. High pressure across the NE 
Pacific will dominate the regional waters for the next few days 
with little change in winds.

Looking ahead, the pressure gradient will increase N of 20N and W
of 130W between the high and low pressure moving northward W of
140W. SE flow around the high will increase to fresh to strong 
with seas building to 7-9 ft Thu night. The low may then briefly
cross to near 30N140W by late Fri night. The gradient may
continue to tighten and if so, gale conditions may be possible 
in the NW corner with seas building to well over 12 ft.

$$
AL

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Page last modified: Monday, 18-Dec-2017 21:09:37 UTC