000
AXPZ20 KNHC 211604
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1605 UTC Wed Mar 21 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 1200 UTC surface analysis and satellite imagery through 
1545 UTC. 

...SPECIAL FEATURES...

Gulf of Tehuantepec Gale Warning: High pressure building into 
southern Mexico behind a frontal system across the southern Gulf 
of Mexico is supporting strong to near-gale north winds into the 
gulf this morning. Winds in Tehuantepec will further strenghten 
to minimal gale force this evening. Gale conditions are then 
expected to continue through Fri morning, with seas building to 
a max of 13-14 ft. 

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

A surface trough extends from 07N77W to 04N92W. The ITCZ axis 
continues from 04N92W to 05N120W to 07N140W. Scattered moderate 
and isolated strong convection from 04N to 09N between 117W and 
129W. Scattered moderate convection is from 0N to 07N between 
84W and 100W.

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Please see see Special Features Section above for details on 
gale force winds expected to affect the Gulf of Tehuantepec.

Weak high pressure is centered W of the Baja peninsula near 27N 
119W. The high will support gentle northerly winds in the Baja 
offshore waters through Thursday. Moderate northerly winds will 
develop Fri morning as a strong ridge builds NW of the forecast 
area behind a cold front moving into southern California.
  
Gulf of California: Scatterometer data shows moderate NW winds 
across the southern half of the gulf. These winds are forecast 
to gradually diminish through tonight along with 3-4 ft seas.

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

Gulf of Papagayo: Fresh to locally strong northeast winds are 
downstream from the Gulf of Papagayo extending to 88W with seas 
to 8 ft. Stronger winds to near gale-force are expected early 
Thu morning through Sun with max seas building to 10-11 ft. 

Fresh to strong northerly winds are also expected downstream of 
the Gulf of Panama starting tonight through Sat night. Light to 
gentle offshore flow will prevail elsewhere.

REMAINDER OF THE AREA... 

A 997 mb surface low pres system N of the area near 34N133W 
extends a cold front from 30N128W to 21N140W. Moderate to fresh 
SW to W winds are in the vicinity of a surface trough that 
extends from 30N137W to 29N140W. Large seas to 12 ft and long 
period NW swell are in the NW part of forecast waters. The low 
will lift northward away from the area today, however large NW 
swell will propagate southeastward through Sat.

A progressive pattern will affect the northeast portion of the 
area through Thu night. A deep layer low pres system located NW 
of the area is preceded by deep mid to upper level moisture that 
will support clouds and precipitation streaming into southern 
California.

$$
Ramos