Area Forecast Discussion
Issued by NWS Brownsville, TX
FXUS64 KBRO 210923
Area Forecast Discussion
National Weather Service Brownsville TX
423 AM CDT Tue Mar 21 2017
.SHORT TERM (Today through Wednesday): High presssure at the surface
and aloft will maintain very warm and dry conditions across Deep
South Texas through the short-term. Very dry air (especially above
925 mb) will mix down today with dewpoints away from the coast
dropping into the mid to upper 50s. The interaction of surface high
pressure over the Gulf and lower pressure across west Texas will
support breezy south-southeast winds today. High temperatures today
will be in upper 80s to lower 90s (except for the low to mid 80s
near the coast) due to combination of abundant sunshine and a drier
airmass in place. Southeast winds will gradually diminish after
sunset this evening. Low temperatures tonight will be in the 60s
across most of the area under partly cloudy skies. Patchy fog will
be possible late tonight across portions of the northern ranchlands.
Wednesday will be a repeat of today with plenty of sunshine and high
temperatures in the 80s to lower 90s. Breezy southeast winds will
develop again on Wednesday due to the tight pressure gradient.
.LONG TERM (Wednesday Night through Monday): 500 mb ridging will
prevail over TX on Wed Night into early Thurs. A strong closed low
will then move into the south central Plains states late Thurs
through Fri Night. This closed low will then exit the region early
Sat which will allow some shallow 500 mb ridging to build into the
area on Sat and Sat Night. Another short wave/closed low will then
move over the south central Plains states on Sun exiting the
region on Mon. This steady progression of 500 mb troughs/closed
lows moving from west to east will push a couple of frontal
systems across the central and northern portions of TX through the
longer range period. But these cold fronts appear to be too weak
to make their way through the RGV providing any kind of
significant CAA. Solid low level WAA and elevated 1000-500 mb
thickness values will persist throughout the longer range period
which will maintain overall temps well above climo for late March.
Overall moisture advection ahead of these systems remains very
limited and expect only some slgt chc pops on Fri with the
approach and passage of the 500 mb closed low.
The ECMWF and the GFS model guidance are in better agreement
through Day 7 for temps and pops versus yesterdays model runs with
the GFS coming more in line with the warmer solution indicated by
the ECMWF. Overall confidence in the forecast wording through Day
7 is above average today.
.MARINE (Now through Wednesday): Buoy 42020 reported south winds
around 14 knots with gusts near 16 knots and seas of 2.6 feet with a
period of 5 seconds at 03 CDT/08 UTC. Surface high pressure over the
Gulf of Mexico and lower pressure across west Texas will maintain
moderate winds and low to moderate seas through the short term.
Winds on the Laguna Madre will become elevated today and Wednesday
resulting in small craft exercise caution conditions each afternoon.
Wednesday Night through Saturday Night...The PGF will strengthen
along the lower TX coastline ahead of the low pressure system
moving into the south central Plains states starting Wed Night
and Thurs. This will likely result in stronger S-SE surface winds
along the lower TX coastline with these stronger winds persisting
into the weekend. SCA conditions will be likely mainly for the
Gulf waters into Sat. SCEC to marginal SCA conditions will be
possible across the Laguna Madre mainly for Thurs and Fri.
.PRELIMINARY POINT TEMPS/POPS...
BAYVIEW/PORT ISABEL 85 69 83 70 / 0 0 0 0
BROWNSVILLE 85 68 85 69 / 0 0 0 0
HARLINGEN 88 66 87 68 / 0 0 0 0
MCALLEN 91 67 89 68 / 0 0 0 0
RIO GRANDE CITY 92 66 91 67 / 0 0 0 0
SOUTH PADRE ISLAND 77 70 77 71 / 0 0 0 0
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