000
AXPZ20 KNHC 250920
TWDEP 

Tropical Weather Discussion 
NWS National Hurricane Center Miami FL
1005 UTC Fri May 25 2018 

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 
0900 UTC.  
  
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends west from Panama near 09N78W across 
Costa Rica to 12N94W, then dips southwest to 07N113W, where it 
transitions to an ITCZ which continues northwest to 11N131W then 
west-southwest to 09N140W. A surface trough that interrupts the 
ITCZ is analyzed from 15N130W to 09N132W. Scattered moderate 
isolated strong convection is noted from 05N to 10N between 118W 
AND 122W, and from 11N to 14N between 123W and 131W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Weak high pressure is centered near 27N122W. A ridge extending 
from high pressure centered in the north-central Pacific near 
35N150W will gradually expand east-southeastward to near the 
Revillagigedo Islands through Sat, tighten the pressure gradient 
over the waters west of the Baja peninsula and support fresh to 
locally strong NW winds this weekend. Seas are forecast to build 
to 6 to 9 ft SW of Baja California by Sun morning.
  
Gulf of California: A fresh W to SW breeze is expected N of 29N 
this evening as a weak surface low tracks eastward across the 
northern gulf waters. Gentle to moderate NW winds will prevail 
across the central and southern Gulf through early Sat.

Gulf of Tehuantepec: Moderate to locally fresh nocturnal drainage 
flow is expected through early Sat.
  
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR... 

A monsoon trough displaced northward into southern Mexico and 
Guatemala by developing low pressure over the Yucatan peninsula 
will support gentle to moderate southwest to west winds in the 
waters west of Central America through Mon, with seas expected 
to be generally 4 to 7 ft through the weekend.
 
REMAINDER OF THE AREA...
   
A weakening cold front extends from 30N129W to near 24N140W with 
a weak surface low evident on the front near 32N130W. The front 
will lose identity as it tracks slowly eastward through tonight. 
NW swell associated with this front will maintain 7-8 ft seas in 
the waters N of 29N W of 130W through this evening. 

A surface trough is analyzed interrupting the convergence zone 
from 15N130W to 09N132W. The pressure gradient will tighten 
slightly today north and northwest of the trough axis, producing 
fresh trades from 10N to 15N west of 130W, and seas building to 
8 ft. The trough will slowly dissipate during the next 36 hours.
  
$$
Mundell