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Eastern North Pacific Tropical Weather Discussion (Text)



000
AXPZ20 KNHC 240947
TWDEP 

Tropical Weather Discussion 
NWS National Hurricane Center Miami FL
1005 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 0600 UTC surface analysis and satellite imagery through 
0945 UTC.

...Special Feature...

Gulf of Tehuantepec Gale Warning: Minimal gale force winds  
expected to diminish to near gale force before sunrise this 
morning. The pressure gradient will quickly relax today with 
winds less than 20 kt by early this afternoon. Expect maximum 
seas of 11 ft downstream of the gulf near 14.5N95W this morning 
to subside to less than 8 ft tonight. Gentle to moderate 
southerly flow expected the remainder of the period.

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

Scatterometer winds indicate that the ITCZ forms at 06N86W and 
extends w through an embedded n to s orientated trough at 
07N124W, then turns wsw to beyond 05N140W. Scattered moderate 
isolated strong convection is noted within 120 nm either side of 
a line from 03N84W to 07N96W to 08N112W to 05N138W, and also e 
of the trough within 150 nm of 09.5N119.5W.   

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

A surface ridge is meandering from near 22N116W to 14N105W. 
Moderate to locally fresh northwesterly winds are observed 
across the EPAC waters s of 30N w of the Baja Peninsula, with 6 
to 8 ft seas primarily due to long period nw swell. Strong to 
near gale force nw flow is observed to the n of 30N with seas of 
9 to 13 ft. The strong nw winds, and associated nw swell, will 
spread to along 29.5N tonight, and reach along 25N on Tue night 
before beginning to diminish from the s on Wed. Strong to near 
gale force northwesterly winds expected n of 28N late Wed night 
through Fri night, with combined seas of 11 to 16 ft, with the 
highest seas along 32N 

Gulf of California: Fresh to strong nocturnal sw winds are 
expected early this morning and again tonight across the gulf 
waters from 29.5N to 31N, with seas building to about 5 ft. 
Mostly gentle to moderate southerly flow expected s of 29.5N
along a trough that will meander this week.

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

Mostly a gentle onshore breeze expected during the day becoming 
offshore along the coasts at night. Combined seas of 3 to 5 ft 
in mixed SW and NW swell forecast during the next several days.

REMAINDER OF THE AREA...

A ridge will meander from near 32N140W to 13N102W. Expect nw 
swell, in the form of 7 to 9 ft seas, to gradually subside from 
the nw through mid week. Strong nw winds, and seas of 8 to 12 ft 
expected n of 28N e of 123W through early Wed, with similar 
conditions n of 28N e of 127W on Thu through Fri night. 

$$
Nelson

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Page last modified: Monday, 24-Apr-2017 09:47:53 UTC