524
AXPZ20 KNHC 200832
TWDEP
Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Thu Sep 20 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
0830 UTC.
...SPECIAL FEATURES...
The remnants of Tropical Depression Nineteen-E inland along the
coast of Mexico near 28.1N 110.0W, moving NNE at 8 kt. Maximum
sustained winds are 20 kt with gusts to 30 kt. The remnant low
will move further inland this morning, then dissipate in the
afternoon. Scattered heavy showers associated with the low have
moved inland. It will bring widespread heavy rain and gusty
winds to parts of NW Mexico today. Life-threatening flash floods
and landslides are possible. See the latest NHC public advisory
under AWIPS/WMO headers MIATCPEP4/WTPZ34 KNHC for more details.
...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
The monsoon trough extends from 09N79W to 12N110W, then resumes
from low pressure near 17N119W to 13N125W to 12N140W. Scattered
moderate convection is from 07N to 11N between 105W and 115W,
and within 30 nm either side of the axis between 122W and 130W.
...DISCUSSION...
OFFSHORE WATERS WITHIN 250 NM OF MEXICO...
Please see the Special Features section for details on the final
advisory on Remnants of Tropical Depression Nineteen-E, located
over northwest Mexico.
High pressure NW of the area supports moderate to fresh NW winds
W of Baja California. Seas are 5-7 ft across the offshore waters.
The pressure gradient will relax tonight, allowing the winds and
seas to diminish this weekend. NW winds are expected to increase
Mon and Tue as the gradient tightens W of the Baja peninsula.
A locally tight pressure gradient will support pulsing nocturnal
northerly winds in the Gulf of Tehuantepec the next few nights.
OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND
WITHIN 750 NM OF ECUADOR...
Fresh offshore nocturnal winds will pulse across the Gulf of
Papagayo the next several nights.
Cross-equatorial SW swell reaching the Central American coast
will slowly subside this weekend. The monsoon trough will
meander near 10N the next few days.
REMAINDER OF THE AREA...
An elongated surface trough extends from W of southern Baja to a
weak 1010 mb low pressure area centered near 17N119W. Surface
ridging prevails over the waters NW of the trough axis. Moderate
to locally fresh trades are north of the trough west of 120W,
supporting seas to 8 ft from 14N-19N W of 130W. These seas will
subside during the next 2 days as the pressure gradient weakens.
$$
Mundell
