Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 201720
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
1220 PM CDT Fri Jul 20 2018

.AVIATION...
VFR this afternoon with SW to SSW winds becoming S and speeds generally
in a 5 to 10 knot range. Possible MVFR/IFR ceilings and/or fog developing
late tonight through early tomorrow morning with the higher probabilities
to the N and W of the IAH area. Lighter winds. All skies becoming VFR
by around 14-15Z tomorrow morning with SW to SSW winds in the morning
becoming S in the afternoon. Speeds should be similar to today. 42
&&

.PREV DISCUSSION... /ISSUED 940 AM CDT Fri Jul 20 2018/

DISCUSSION...
12z soundings show quite a bit of dry air from the surface up to
around 600 mb. There should be significant mixing today and allow
sfc dew points to fall to near 60 over the far NW and the upper
60`s over the central zones. The dry air will also allow
temperatures to warm up quickly and bringing 850 mb temperatures
down dry adiabatically will support high temperatures in the
lower 100`s over the N-NW zones and near 100 degrees over the
central zones. Have some concern that as the sea breeze/bay breeze
moves inland, there could be a spike in dew points over parts of
Chambers, Liberty, eastern Harris and Galveston counties and heat
index values could reach 108 degrees or higher for a few hours
late this afternoon. Have expanded the Heat Advisory to
incorporate much of SE TX, areas generally E-NE of the San Bernard
River. The Heat Advisory will likely encompass the entire CWA
Sat/Sun. 43

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)     102  77 103  77 103 /   0   0   0   0   0
Houston (IAH)             100  79 101  78 101 /   0   0   0   0   0
Galveston (GLS)            91  82  92  82  91 /   0   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...Heat Advisory until 8 PM CDT this evening for the following
     zones: Austin...Brazoria Islands...Brazos...Burleson...
     Chambers...Coastal Brazoria...Coastal Galveston...Coastal
     Harris...Fort Bend...Galveston Island and Bolivar
     Peninsula...Grimes...Houston...Inland Brazoria...Inland
     Galveston...Inland Harris...Madison...Montgomery...Northern
     Liberty...Polk...San Jacinto...Southern Liberty...Trinity...
     Walker...Waller...Washington.

     High Rip Current Risk until 8 PM CDT this evening for the
     following zones: Brazoria Islands...Galveston Island and
     Bolivar Peninsula.

GM...NONE.
&&

$$



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