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Eastern North Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 240240
TWDEP 

Tropical Weather Discussion 
NWS National Hurricane Center Miami FL
0405 UTC Mon Apr 24 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 0000 UTC surface analysis and satellite imagery through 
0200 UTC.

...Special Features...

Gulf of Tehuantepec Gale Warning: Fresh northerly winds spilling 
across and downstream of the Gulf of Tehuantepec this afternoon 
have begun to increase to 25-30 kt early this evening, raising 
peak seas to near 9 ft. Global models indicate that winds will 
increase briefly to minimal gale force overnight before 
diminishing to 25-30 kt around sunrise. Seas are expected to 
build to 11 ft downstream of the gulf near 14.5N95W by early 
morning. The pressure gradient will then quickly relax during 
the day Monday with winds diminishing to less than 20 kt during 
the afternoon and seas subsiding to less than 8 ft early Monday 
night.

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

The ITCZ extends from 05N85W TO 07N104W TO 08N117W TO 05N132W TO 
beyond 04N140W. Scattered moderate isolated strong convection is 
noted within 120 nm of axis between 85W and 99W. Scattered 
moderate to strong convection in noted within 180 nm N of axis 
between 106W and 121W...and within 90 nm N and 180 nm S of axis 
between 120W and 137W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A weakening cold front moving SE into Baja California Norte and 
the adjacent waters has become ill defined this afternoon. High 
pressure center of 1026 mb centered near 32N142W extends a ridge 
SE to near 16N112W. Gentle to moderate northwesterly winds are 
observed offshore of central Mexico, and light and variable 
offshore of southern Mexico to just west of the Gulf of 
Tehuantepec, with seas of 5-8 ft in long period NW swell. A 
tightening pressure gradient E of the high is already supporting 
 moderate to fresh NW winds north of 27N. Expect fresh to strong 
NW winds and seas of 8-12 ft from 29N to 32N through Mon night. 
These conditions will spread southward on Tuesday and reach as 
far south as 26N by Tuesday night. Strong to near gale force 
northwesterly winds are expected N of 29N late Wed night through 
Fri night with combined seas of 11 to 16 ft.  

Gulf of California: Variable winds prevail around a weak surface 
low N of 30N, but have increase to moderate to fresh SE of the 
low and N of 29N. Fresh to strong nocturnal SW winds are 
expected each of the next few nights across the gulf waters from 
29.5N to 31N, with seas building to 5-6 ft.

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

Gentle mostly onshore flow prevails late this afternoon due to 
daytime heating. Expect a diurnal-nocturnal shift in winds to 
occur the next few days with light to gentle offshore winds 
developing along the coasts at night through morning, and 
onshore flow late morning through the afternoon. Combined seas 
of 3 to 5 ft in mixed SW and NW swell are expected during the 
next several days.

REMAINDER OF THE AREA...

A dry and benign cold front has lost identity late this 
afternoon moving across the far offshore waters of Baja 
California Norte. The associated NW swell will propagate 
southeastward tonight, then subside from the NW Monday through 
Wednesday. Strong NW winds and seas to 12 ft are expected north 
of 29.5N east of 123W tonight through early Wed, with similar 
conditions north of 28N east of 126W Thursday. 

$$
Stripling