000
AXPZ20 KNHC 182125
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 UTC Thu May 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... 

An ill-defined monsoon trough extends from 10N87W to 10N95W to 
07N105W. The ITCZ axis extends from 07N112W to 07N122W to 
05N130W to beyond 04N140W. Scattered moderate isolated strong 
convection is within 45 nm either side of the axis west of 121W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Moderate to fresh northwest winds are off the coast of the Baja 
California peninsula. Light to gentle winds prevail over most of 
the Gulf of California. Gentle to moderate northwest to north 
winds elsewhere. Seas are 7-9 ft west of Baja California Norte 
in NW swell, highest north of 29N. Seas are 6-7 ft west of Baja 
California Sur, 1-3 ft in the Gulf of California, and 4-6 ft 
elsewhere. Wave model guidance suggests that the NW swell will 
subside through Friday night.

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

Gentle to moderate south to southwest winds are west of Ecuador, 
with light to gentle southwest to west winds elsewhere, except 
light winds north of 09N. Seas are 5-7 ft west of Colombia, 6-8 
ft west of Ecuador, and 4-6 ft elsewhere in southwest swell. The 
swell will propagate northward through Saturday, then begin to 
subside Saturday night and Sunday. 

REMAINDER OF THE AREA... 

Strong high pressure centered north of the area near 35N139W 
extends a ridge southeastward to near the Revillagigedo Islands. 
The pressure gradient between the ridge and lower pressure near 
the ITCZ is maintaining moderate to fresh trades north of the 
ITCZ west of 120W. Seas in the trade wind belt are 6-8 ft from 
mixed northeast wind waves and northwest swell. The high will 
shift northeast and weaken this weekend, allowing the pressure 
gradient to relax with winds and seas diminishing.

$$
Mundell