Area Forecast Discussion
Issued by NWS Brownsville, TX

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FXUS64 KBRO 211953

Area Forecast Discussion
National Weather Service Brownsville TX
253 PM CDT Sat Apr 21 2018

.SHORT TERM (Now through Sunday Night): An upper level low will
move across the central plains through the weekend. An associated
surface low will move across north central Texas, bringing a weak
cold front through the area on Sunday morning.

Ahead of the front, isolated showers continue to impact the eastern
half of deep south Texas with mostly cloudy skies. Shower chances
will decrease tonight as northwest winds in the low-levels bring
much drier air to the region. Winds will diminish tonight ahead of
the front with patchy fog possible overnight. Winds will shift out
of the northeast behind the front Sunday morning with gradually
clearing skies in the afternoon and evening. Temperatures remain
warm with cooler overnight temperatures Sunday night due to drier
air and clearing skies. Model guidance indicates that dew points
could drop into the lower 40s in the upper ranchlands where
temperatures may drop into the upper 50s.

.LONG TERM (Monday through Saturday): Models are fairly in good
agreement with the 500mb low/trough across the southeast United
States Monday. A 500mb ridge across northern Mexico and the
southwest U.S. will provide west to northwest flow across south
Texas Tuesday. A 500mb low is progged to develop across the
northern plains Tuesday and move southeast towards Missouri
Wednesday. The upper level low is expected to move southeast into
the southeast U.S. as a shortwave trough Thursday. There are some
differences between the GFS and ECMWF on timing of this feature.
As a result...there are differences on the timing of a weak cold
front moving into south Texas Wednesday and moving into the Rio
Grande valley Wed night into Thursday. Moisture will increase
across the area Wed night into Thursday regardless of the timing
of the front so will mention a slight chance of showers and
thunderstorms across the CWA Wed night into Thursday. Models
continue to diverge on moisture across the area Friday with the
ECMWF wetter than the GFS and has another weak cold front moving
into the area with strong convection moving across the Rio Grande
valley. Will mention a slight chance of showers and thunderstorms
for Friday. The rest of the forecast period depends on whether a
front does move through deep south TX Friday providing lingering
moisture across the RGV Saturday and northeast flow at the surface
in combination with clouds providing slightly cooler temperatures.
Will go with a blend of model guidance for temperatures and POPS
Wed night through Saturday.

.MARINE (Now through Sunday night): Moderate to strong southeasterly
winds across the coastal waters this afternoon will diminish tonight
with the approach of a weak cold front. Winds will shift out of the
north at 15 to 20 knots behind the front on Sunday morning. Seas
will remain elevated through Sunday before improving Monday

Monday through Thursday...Light east to northeast winds will
prevail across the coastal waters Monday with surface high
pressure across south Texas and the western Gulf of Mexico. The
pressure gradient will remain weak across the lower TX coast
Tuesday. Light east to southeast winds will prevail across the
western Gulf Tuesday. Winds will veer to the southeast briefly on
Wednesday before backing to the east Wed night as a weak cold
front approaches the coastal bend. The front may move through the
coastal waters late Wed night/Thurs morning. Winds will shift to
the northeast but remain light in the wake of the front.

BAYVIEW/PORT ISABEL  71  81  63  79 /  10  10  10  10
BROWNSVILLE          72  84  63  82 /  10  10  10  10
HARLINGEN            70  85  61  83 /  10  10  10  10
MCALLEN              72  89  64  85 /  10  10  10  10
RIO GRANDE CITY      69  89  62  86 /  10  10  10  10
SOUTH PADRE ISLAND   72  77  67  77 /  10  10  10  10



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