000
AXPZ20 KNHC 172041
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
2205 UTC Fri Sep 17 2021

Tropical Weather Discussion for the eastern Pacific Ocean from
03.4S to 30N, east of 120W including the Gulf of California, and
from the Equator to 30N, between 120W and 140W. The following
information is based on satellite imagery, weather observations,
radar, and meteorological analysis.

Based on 1800 UTC surface analysis and satellite imagery through
2030 UTC.

...TROPICAL WAVES...

The axis of a tropical wave extends near 84W north of 05N, 
moving west around 10 kt. No significant deep convection is 
occurring over the Pacific in association with this wave.

The axis of a tropical wave extends near 97W north of 05N, 
moving west around 10 kt. Scattered moderate convection is noted
from 10N-13N between 96W-100W. 

The axis of a tropical wave extends near 111W from 05N to 16N, 
moving west around 15 kt. No significant deep convection is 
noted in association with this wave.

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

The monsoon trough extends from 09N78W over Panama to 13N110W to
10N137W. The ITCZ continues from 10N137W to beyond 10N140W.
Numerous moderate convection is occurring from 08N-11N between
125W-138W. Scattered moderate convection is noted from 09N-11N 
between 90W-92W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Surface ridging extends from 32N140W southeastward to 18N112W. 
Winds are tranquil throughout the Mexican offshores. Seas are 5-6
ft mainly in S swell along the Mexican Pacific offshore waters 
and 2-4 ft in the Gulf of California.

In the forecast, the surface ridging west of California will 
promote moderate to fresh NW winds along the west coast of Baja 
California Sat and Sun. A Gulf of Tehuantepec gap wind event 
should begin Tue night and may bring near-gale conditions on Wed.
No tropical cyclone activity is expected for the next several 
days.

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

A weak pressure gradient is promoting only moderate and weaker 
winds across the Central American and equatorial offshore waters 
today. A SW swell is promoting seas 6-8 ft in the equatorial 
waters and around 6 ft in the Central American waters. 

In the forecast, the moderate SW swell across the equatorial 
waters will diminish by Sun. Otherwise, tranquil conditions 
should prevail through at least Wed night. 

REMAINDER OF THE AREA...

Surface ridging extends from 32N140W southeastward to 18N112W.  
The NE to E trades south of the ridge are moderate or weaker, as 
well as the SE to SW winds south of the monsoon trough/ITCZ. Seas
are 7-8 ft south of 03N primarily due to SW swell and 5-7 ft 
elsewhere. 

In the forecast, little change in winds across the basin is
anticipated and no tropical cyclone activity is expected through
the next several days. The moderate SW swell across the 
equatorial waters will diminish by Sun. A moderate NW swell may 
reach our northern border on Mon and Tue before beginning to
diminish on Wed.

$$
Landsea