000
AXPZ20 KNHC 270945
TWDEP 

Tropical Weather Discussion 
NWS National Hurricane Center Miami FL
1005 UTC Thu Apr 27 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.

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

A surface trough extends from 08N87W to 08N90W to 07N107W where 
scatterometer winds indicate that the northern ITCZ forms, and 
then continues sw through 03N127W to beyond 02N140W. Scattered 
moderate isolated strong convection is noted along the Pacific 
coast of Costa Rica within 45 nm of 09.5N85.5W. Similar 
convection is observed within 120 nm either side of a line from 
03N90W to 07N107W to 05N133W.

...DISCUSSION...   

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Strong to near gale force northwesterly winds are observed 
across the discussion waters n of 28.5N w of the Baja Peninsula, 
with 8 to 13 ft seas that will increase to 15 ft tonight.
Moderate nw flow is expected elsewhere w of Baja today with 4 to 
7 ft primarily in nw swell, that will gradually increase to 6 to 
9 ft seas from the n through Sat night.  These seas should 
subside to less than 8 ft to the s of 30N on Sun night into Mon.
Another batch of nw swell will reach 30N120W on Mon night.

Gulf of California: Mostly gentle to moderate southwesterly flow 
expected through Fri night with a brief fresh to locally strong 
breeze possible over the gulf waters n of 30N on Sat morning.

Gulf of Tehuantepec: Gentle to moderate southerly flow expected 
this weekend with fresh n winds possible around sunrise on Mon.

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.
Large long period sw swell will approach the offshore waters on
Mon.  

REMAINDER OF THE AREA...
  
A ridge will meander from near 32N140W to near 08N106W. Strong 
nw winds, and seas of 8 to 12 ft expected n of 28N e of 125W 
today through early Sat. Fresh ne trades expected between the 
ridge and the ITCZ, with seas to 8 ft through the upcoming 
weekend. Southern hemispheric swell in the form of 7 to 9 ft 
seas, will reach the equator between 110W and 127W tonight on 
Fri and reach along 12N110W on Sat night.

$$
Nelson