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Eastern North Pacific Tropical Weather Discussion

AXPZ20 KNHC 260937

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Fri Aug 26 2016

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
0900 UTC.


Tropical Storm Lester is centered near 16.9N 114.5W at 26/0300
UTC or about 430 nm to the south-southwest of the southern tip of
Baja California. Lester is moving W or 280 deg at 6 kt with
maximum sustained winds of 50 kt with gusts to 60 kt. The
estimated minimum central pressure is 1000 mb. Satellite imagery
shows numerous strong convection within 105 nm NW and 45 nm SE
semicircles of center. Scattered moderate isolated strong convection
is noted elsewhere from 15N to 19N between 111W and 116W. A recent
scatterometer pass indicate that the wind field associated with
this tropical cyclone has slightly increased with winds of 20-30
kt extending within about 120 nm of the center, except within
about 90 nm SW quadrant. Lester is forecast to continue moving
away from the Mexican offshore waters on Friday, and is forecast
to strengthen to a hurricane near 17N118W on Saturday. Please read
the NHC forecast/advisory under AWIPS/WMO headers MIATCMEP3/WTPZ23
KNHC or the public bulletin under MIATCPEP3/ WTPZ33 KNHC for more

Showers and thunderstorms continue to show signs of organization in
association with a broad area of low pressure located near
13.5N133W or about 1340 miles east-southeast of the Big Island of
Hawaii. Latest satellite imagery shows that overall cloudiness
and convection has increased during the past hours in association
with this area. Numerous moderate to scattered strong convection
is noted mainly west of the center from 13N to 15N between 133W
and 136W. Similar convection is from 12N to 13N between 134W and 136W.
A tight gradient between this area of low pressure and the sub-
tropical ridge to its north is resulting in moderate to fresh
northeast winds from 13N to 18N and west of 130W based on a recent
Ascat pass. Strong south-southwest were also indicated by the same
Ascat pass to the south of the low from about 07N to 10N between
132W and 136W. Seas with these winds are within the 6 to 9 ft
range. Environmental conditions are expected to be conducive for
development, and a tropical depression is likely to form by this
weekend while the low moves westward or west-northwestward at 15
to 20 mph. This system is forecast to move west of area by
Saturday night.


No tropical waves at this time.


The monsoon trough axis extends from 12N95W to 09N101W to 11N109W.
It resumes at 13N120W to low pressure near 13.5N133W 1008MB to
beyond 11N140W. Scattered moderate isolated strong convection is
from 07N to 10N between 95W and 102W, from 10N to 13N between 98W
and 104W, and FROM 09N TO 11N W of 128W.



Recent scatterometer data provided observations of moderate to
locally fresh NW winds just off the Baja California coast due to
the pressure gradient between the ridge over the north waters and
a trough over Baja California. The same Ascat pass showed mainly
moderate southerly winds across the Gulf of California or Sea of
Cortez mainly N of 27N. This weather pattern is forecast to
persist over the weekend. T.S. Lester is forecast to continue
moving away from the Mexican offshore waters today. Please see
above for details. 


Light to moderate SW winds south of the monsoon trough will
continue to spread to the coastal sections through Friday, then a
light and variable onshore flow is expected Saturday and Sunday.


A broad surface ridge covers the remainder of the area,
extending from a large 1040 mb high near 47N146W. The pressure
gradient between the low pressure located near 13.5N133W and the
ridge will yield fresh winds across the trade wind belt, generally
from 21N southward to near the trough. Seas ranging from 6 to 8
feet presently in this area.