000
AXPZ20 KNHC 202305 AAA
TWDEP
Tropical Weather Discussion...Updated
NWS National Hurricane Center Miami FL
2305 UTC Mon Apr 20 2026
Updated Remainder of the Area section
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
2115 UTC.
...SPECIAL FEATURES...
Gulf of Tehuantepec Gale Warning: A tight pressure gradient
between high pressure ridging along eastern Mexico and lower
pressure to the south is sustaining minimal gale-force north to
northeast winds over the northern Gulf of Tehuantepec region. The
gradient will relax by early this evening allowing for the gale
winds to diminish to strong speeds. Seas with these winds are
peaking to near 11 ft. Leftover rough seas will subside Tue evening.
Marine interests transiting through, or near the Gulf of Tehuantepec
should stay tuned to the latest forecast.
Please read the latest High Seas Forecast issued by the National
Hurricane Center at website
https:///www.nhc.noaa.gov/text/MIAHSFEP2.shtml for more details.
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
A trough axis extends from low pressure along the coast of
Colombia near 11N76W 1011 mb southwestward across southern
Panamas and to 02N82.5W to 05N90W to a 1011 mb low at 05N97W and
to 03N101W, where it transitions to the ITCZ to 04N110W to
01S120W. Scattered moderate to isolated strong convection is
within 120 nm north of the ITCZ between 115W-121W. Scattered
moderate convection is within 120 nm north of the trough between
85W-89W. A second ITCZ extends from near 07N129W to beyond
05N140W. Scattered moderate to isolated strong convection is
within 60 nm south of the ITCZ between 136W-139W.
...OFFSHORE WATERS WITHIN 250 NM OF MEXICO...
Please see the Special Features section above for information on
an ongoing, but soon to end, gap wind gale-event in the Gulf of
Tehuantepec.
Relatively weak high pressure is over the area. The pressure
gradient between the high pressure and lower pressures over
Mexico is generally supporting gentle northwest winds west of
the Baja California Peninsula, with the exception of fresh
northwest winds just south of Cabo San Lucas as seen in a
scatterometer satellite pass. Elsewhere over the regional
waters, winds are gentle or weaker in speeds. Seas are 3 to 5 ft
over the offshore waters, with northwest swell west of Baja
California and mostly in long-period south swell elsewhere.
Mostly light and variable winds are in the Gulf of California,
except for moderate south to southwest winds in the northern
portion. Seas are 1 to 3 ft in the Gulf, except for slightly higher
seas of 3 to 4 ft in the southern section.
For the forecast, aside from the ongoing Gulf of Tehuantepec
gale event, rather quiet conditions will remain over the forecast
waters through Tue. A set of northwest swell will move through
the waters west of Baja California Norte Tue night into Wed, but
will be subsiding as it does. Seas are expected to peak to
around 8 ft with this swell. Fresh to locally strong northwest
winds are forecast over the Pacific waters of Baja California
beginning Wed night. Northwest winds will pulse to moderate to
fresh speeds at night offshore southwestern Mexico Tue through
Fri. Elsewhere, mostly light to gentle west to northwest winds
are expected through the end of the week.
....OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...
Moderate to fresh northeast to east winds are in the Gulf of
Papagayo as indicated in the latest scatterometer satellite data
pass. Seas are 4 to 6 ft with these winds. Moderate north to
northeast winds are in the Gulf of Panama. Seas are 4 to 6 ft in
long-period south to southwest swell. Light to gentle variable winds
prevail elsewhere along with seas 4 to 6 ft also due to a long-
period south to southwest swell.
Isolated showers and thunderstorms are over waters between 85W
and the Galapagos Islands, including over some of these islands.
For the forecast, winds may pulse to fresh speeds in the Gulf of
Papagayo region late tonight and Tue morning and again late Tue
night into Wed morning. Otherwise, rather tranquil conditions are
expected to continue over the Central American and the equatorial
waters through the end of the week.
...REMAINDER OF THE AREA...Updated
A late-season cold front is over the northwest part of the area
from near 30N128W to 24N140W. Gentle to moderate southwest winds
are within 120 nm east of the front north of 26.5N. The front is
followed by gentle to moderate northwest to north winds, except
north of 28N where the latest scatterometer satellite data pass
shows moderate to fresh northwest winds. A set of long-period
northwest to north swell follows the front north about 27N and
west of a line from 30N131W to 27N140W. High pressure ridging is
building southeastward behind the front while relatively weak
high pressure is to its southeast as a 1018 mb high center is
analyzed near 24N135W. A weak pressure gradient between the ridge
and relatively lower pressure to its south associated to the
ITCZ is sustaining an area of moderate northeast to east trades
over the western part of the discussion area from 14N to 18N and
west of about 133W, and also from 05N to 15N between 114W and
133W. Seas over this area are 5 to 7 ft primarily in north swell.
For the forecast, the aforementioned cold front will move east-
southeastward, weakening Tue and dissipating Wed. The swell set
behind the front is forecast to raise seas to around 12 ft tonight
into early Tue over the far northwest waters. The swell will then
gradually shrink in coverage area over the west-central waters
through late Thu. Little overall changes are expected with winds
and seas elsewhere through Thu.
$$
Aguirre
