Area Forecast Discussion
Issued by NWS Brownsville, TX

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FXUS64 KBRO 241020

Area Forecast Discussion
National Weather Service Brownsville TX
420 AM CST Wed Jan 24 2018

.SHORT TERM (Now through Thursday): A mid-level low pressure
system will move eastward into West Texas this afternoon with
surface high pressure slowly moving eastward into the Southeast
United States. A sharp moisture gradient exists across the lower
portions of the Rio Grande Valley and over the southern coastal
waters. Most shower activity overnight tonight has remained over
extreme Northeast Mexico and near Brownsville with very little
rainfall amounts. Today, scattered showers are possible again
mainly in the lower Rio Grande Valley with below-normal
temperatures as skies remain mostly cloudy. Northeast winds will
shift back to the east late tonight into Thursday, increasing
middle and lower level moisture further northward, bringing
scattered light showers across the eastern two thirds of Deep
South Texas. High temperatures again will be several degrees below
normal in the mid 60s due to cloud cover and rain chances.

.LONG TERM (Thursday Night through Tuesday): A 500mb shortwave
trough across the Texas panhandle Thursday and low to mid level
moisture across northeast Mexico and deep south TX will provide a
chance of showers across the Rio Grande valley Thurs night into
Friday. Rain chances are expected to increase on Saturday as a
cold front moves into central TX Sat afternoon. The front will
move through the RGV Sat night and rain chances will diminish Sat
night into Sunday but a slight chance of showers will linger
across the area with moisture across northeast Mexico. Drier air
will filter into the RGV early next week providing dry conditions
through the rest of the forecast period.

.MARINE (Now through Thursday): Persistent fetch of northeast winds
will continue through today with surface high pressure over the
Mississippi River Valley maintaining moderate seas of 3 to 5 feet.
Surface high will move eastward, shifting winds back to the east and
eventually southeast. Moisture will increasing, bringing scattered
rain chances over the coastal waters.

Thursday night through Sunday...Light to moderate east to
southeast winds will prevail across the coastal waters Thurs night
with surface high pressure across the mid-Atlantic United States
coast. The pressure gradient will weaken across the lower Texas
coast Friday. Light southeast winds should prevail across the
western Gulf of Mexico Friday before backing to the east on
Saturday. A cold front is expected to move through the coastal
waters Sat night. Winds will shift to the northeast Sat night and
increase Sunday. Moderate to strong northeast winds will develop
across the lower TX coast Sunday and small craft advisories may
be needed for the offshore waters.

BAYVIEW/PORT ISABEL  64  50  65  61 /  30  20  30  30
BROWNSVILLE          65  51  65  60 /  30  20  30  30
HARLINGEN            66  49  65  59 /  30  20  30  30
MCALLEN              67  49  66  58 /  20  20  30  30
RIO GRANDE CITY      67  46  65  57 /  10  10  20  20
SOUTH PADRE ISLAND   63  53  64  62 /  30  20  30  30



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