000
AXPZ20 KNHC 170941
TWDEP

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Thu Sep 17 2020

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
0840 UTC.

...TROPICAL WAVES...

A tropical wave along 110W N of 04N, has become nearly stationary
during the past 6 hours, and is becoming absorbed within a low to
middle level trough aligned NNE to SSW across this same area. 
Associated convection is described below. Active convection is
expected across this area during the next 24 hours.

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

The monsoon trough extends from 12N78W to 10N84W to 14N97W to 
low pres 1010 mb near 13N110W to 16N127W to 14N140W. Scattered 
moderate isolated strong convection is noted along the coast of 
Colombia from 02N to 07N E of 80W, within 120 nm either side of 
line from 19N110W to 07.5N118W, and from 19N to 23.5N E of 108W 
to the Mexican coast. Scattered moderate to strong convection 
noted from 05N to 13.5N between 82W and 92W, and from 09N to 12N 
between 96W and 100W.

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Post-Tropical Cyclone Karina near 23.3N 125.3W is exiting the
region tonight. South to southwest swell from Karina will 
continue to spread north and northeastward across the offshore 
waters of Baja California through early Thu.

Weak high pressure will build weakly southward across the
northern waters, between Karina and Baja California. This pattern
will produce moderate northerly winds and seas across the 
offshore waters of Baja California Norte through Sun. Farther 
south, a weak surface trough will develop well offshore of Cabo 
Corrientes. This will maintain light to gentle winds and slight 
seas through Sun. 

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

Gentle to moderate S to SW winds persist south of the monsoon 
trough. Elsewhere, gentle winds prevail north of the monsoon 
trough. Combined seas are currently in the 4-7 ft range in a mix
of wind waves and S to SW swell, except 5 to 8 ft south of the 
equator. Seas may build S of Panama by late Thu in southerly
swell. 

REMAINDER OF THE AREA...

Post-Tropical Cyclone Karina is located near 23.3N 125.3W 1006 
MB AT 0600 UTC moving W at 7 KT. Maximum sustained winds are 30 
kt with gusts to 40 KT. Seas of 8 to 11 ft persist within 120 nm
across the NW semicircle tonight. Convection associated with 
Karina has become sheared to the north, leaving a swirl of 
overcast low clouds. Karina will continue moving westward and 
gradually weaken overnight then veer southwestward late Thu and 
dissipate into a trough Fri through Sat. 

A stationary front is over the NW waters from 32N131W to beyond 
26N140W where it continues as a dissipating stationary front. 
Light and variable winds are ahead of the front. The front will 
drift E-SE during the next couple of days before dissipating. 
Light to moderate NE trades prevail across the waters SW of 
Karina and north of the monsoon trough. Combined seas are 
generally 4-7 ft. A broad area of fresh monsoonal flow prevails 
south of the monsoon trough between 105W to 110W, with seas 
generally 7-8 ft in this region. This will persist through Fri. 

$$
Stripling