Small Craft Advisory 21, NWS Brownsville, TX

212 
WHUS74 KBRO 180004
MWWBRO

URGENT - MARINE WEATHER MESSAGE
National Weather Service Brownsville TX
704 PM CDT Fri Apr 17 2026

GMZ130-132-135-150-155-170-175-180115-
/O.EXP.KBRO.SC.Y.0021.000000T0000Z-260418T0000Z/
Laguna Madre from the Port of Brownsville to the Arroyo Colorado-
Laguna Madre from the Arroyo Colorado To 5 NM north of Port
Mansfield TX-
Laguna Madre from 5 nm north of Port Mansfield to Baffin Bay TX-
Gulf waters from Port Mansfield to the Rio Grande out 20 nm-
Gulf waters from Baffin Bay to Port Mansfield out 20 nm-
Gulf waters from Port Mansfield to the Rio Grande extending from
20 to 60 nm-
Gulf waters from Baffin Bay to Port Mansfield extending from
20 to 60 nm-
704 PM CDT Fri Apr 17 2026

...SMALL CRAFT ADVISORY HAS EXPIRED...

Winds have diminished below Small Craft Advisory criteria.
However, Small Craft should still exercise caution as winds remain
elevated.  

$$

Area Forecast Discussion
National Weather Service Brownsville TX
207 PM CDT Fri Apr 17 2026

...New DISCUSSION, MARINE...

.KEY MESSAGES...
Updated at 155 PM CDT Fri Apr 17 2026

Key Messages:

 * Dry and breezy conditions continue through Saturday afternoon
   due to a tightened pressure gradient.

 * A cold front is expected Saturday night into Sunday morning
   which will bring moderate to high (60-90%) chances for rain
   through Tuesday morning.

 * Most areas should receive between 1 and 2 inches of rain, but
   some areas could see locally heavier amounts of 3 to 4 inches.
   Isolated flash flooding is possible in low-lying or poor
   drainage areas that receive heavier rainfall.

 * Temperatures will fall 15-30 degrees into Sunday morning.

 * A high risk of rip currents is expected over the weekend with
   elevated surf and minor coastal flooding near high tide cycles.

&&

.DISCUSSION...
Issued at 155 PM CDT Fri Apr 17 2026

Dry and unseasonably warm conditions are expected through Saturday
afternoon, ahead of a strong cold front that will pass through Deep
South Texas during the overnight hours into Sunday. Showers and a
few thunderstorms are highly likely both ahead of the front and
after the front has moved through the area, with the rain expected
to be widespread and beneficial. Chances tomorrow night range
between 70-90% and stay high (70-80%) on Sunday.  Latest guidance is
indicating an increased chance of rain (around 60-70%) for both
Sunday night and Monday as the frontal boundary may hang around our
area longer than previously thought.

Most likely rainfall amounts between Saturday evening and Tuesday
morning for most areas are expected to be between 1-2 inches, with
some areas receiving closer to 3-4 inches in areas of locally heavy
rainfall. Due to the unusually moist atmospheric profile, the
Weather Prediction Center placed our entire CWA under a marginal
(level 1 of 4) risk of excessive rainfall for Sunday. This means
there will be a small chance for nuisance and isolated flash
flooding in low lying and poor-drainage areas.

After the frontal passage, temperatures will be unseasonably cool
Sunday and Monday before warming back to seasonal levels by
Tuesday. On Sunday, some areas in the western portion of the CWA
may not even reach 70 degrees, but the Lower Rio Grande Valley is
supposed to be closer the mid-70s. Overnight lows Sunday night
will be in the upper 50s/lower 60s. Be the end of next week,
temperatures will be unseasonably warm again with dry conditions
expected.

Hazardous coastal conditions are also expected with this cold front,
including life-threatening rip currents and elevated surf, as well
as some potential beach run-up near high tide cycles, as
astronomical tides begin to increase over the weekend.

&&

.AVIATION...
(18Z TAFS)
Issued at 1239 PM CDT Fri Apr 17 2026

Mostly VFR conditions ongoing, however this is not expected to
persist with lower MVFR CIGs forecast for the evening to early
tomorrow morning period. Otherwise, elevated and gusty southerly
to southeasterly flow to prevail past the end of this TAF cycle.

&&

.MARINE...
Issued at 155 PM CDT Fri Apr 17 2026

Due to a tightened pressure gradient, SCEC conditions are ongoing in
the Bay and the Gulf waters and are expected to improve overnight.
However, SCEC conditions and Small Craft Advisory conditions are
expected to develop again by Sunday morning as a cold front passes
through the area.  This should hang around through mid-day Monday
before conditions start to improve towards favorable.  SCEC
conditions could then develop again by Friday.

&&

.PRELIMINARY POINT TEMPS/POPS...
BROWNSVILLE             74  88  68  76 /   0   0  70  80
HARLINGEN               71  90  64  75 /   0   0  70  70
MCALLEN                 74  93  65  73 /   0  10  80  80
RIO GRANDE CITY         72  93  62  68 /   0  10  90  70
SOUTH PADRE ISLAND      74  80  71  74 /   0   0  70  80
BAYVIEW/PORT ISABEL     72  86  67  76 /   0   0  70  80

&&

.BRO WATCHES/WARNINGS/ADVISORIES...
TX...None.
GM...None.
&&

SHORT TERM...55-MM
LONG TERM....55-MM
AVIATION...55-MM