Area Forecast Discussion
Issued by NWS Brownsville, TX

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FXUS64 KBRO 261142 AAA

Area Forecast Discussion...UPDATED
National Weather Service Brownsville TX
642 AM CDT Fri May 26 2017

.DISCUSSION...Updated for latest aviation discussion below.


.AVIATION...Mostly cloudy skies with moderate southeast winds
prevail across Deep South Texas this morning. Winds will become
breezy later this morning into the afternoon as low pressure
across the southern Plains interacts with Gulf high pressure.
MVFR ceilings expected to persist through mid to late morning with
full VFR conditions returning by early afternoon as the cloud
layer mixes out. MVFR ceilings will develop late this evening as
southeast winds remain moderate overnight.


.DISCUSSION...Updated for latest marine discussion below.


.MARINE...Have extended the small craft advisory for the Gulf
waters 0 to 60 NM out due the elevated seas. Marine conditions on
the Gulf waters are expected to improve by mid morning.


.PREV DISCUSSION... /issued 427 AM CDT Fri May 26 2017/

SHORT TERM (Now through Saturday): 500 mb ridge overhead will provide
subsidence across Deep South Texas and the Rio Grande Valley through
the period. The pressure gradient will strengthen today as low
pressure across the southern Plains interacts with Gulf high
pressure. This will support breezy southeast winds across the area
later this morning into the afternoon. Very warm to hot...breezy and
humid conditions will prevail across the region today through
Saturday with no rain chances expected through the period. Heat
index values of 105 to 110 degrees will be possible across portions
of the area this afternoon and Saturday afternoon as dewpoints
continue to increase.

LONG TERM (Saturday Night through Thursday): The most active
period of the long term portion of the forecast will be Monday
afternoon through Tuesday afternoon, as a 500 mb shortwave
transitions over the southern half of Texas, generating scattered
showers and thunderstorms across Deep South Texas and the Rio
Grande Valley. Outside of this time period, dry weather or
isolated convection is anticipated, with mid-level high pressure
generally in control. Well above normal temperatures early in the
forecast will be brought down to more near normal values as cloud
coverage and rain chances increase.

MARINE (Now through Saturday): Buoy 42020 reported south-southeast
winds around 23 knots with gusts near 27 knots and seas of 5.9 feet
with a period of 6 seconds at 03 CST/08 UTC. A small craft advisory
remains in effect until 7 am for the Gulf waters. The pressure
gradient will strengthen today as low pressure across the southern
Plains interacts with Gulf high pressure. A small craft advisory is
in effect for the Laguna Madre from 10 am to 7 pm this evening due
to winds. SCEC to low-end SCA conditions expected across lower Texas
Gulf waters for today. Additional small craft advisories may be
needed for all or portions of the Lower Texas coastal waters tonight
and Saturday due to the tight pressure gradient.

Saturday Night through Thursday: Generally moderate wind and sea
conditions will prevail through a majority of the forecast period
with high pressure over the Gulf of Mexico interacting with low
pressure inland. Small Craft Exercise Caution may be needed
periodically. Winds and seas may become adverse enough at the end
of the forecast period that Small Craft Advisories may be needed
on Thursday.


GM...Small Craft Advisory for winds from 10 AM this morning to 7 PM
     CDT this evening for GMZ130-132-135.

     Small Craft Advisory until 9 AM CDT this morning for GMZ150-155-



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