Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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000
FXUS64 KHGX 182015
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
315 PM CDT Tue Jul 18 2017

.DISCUSSION...
The convection which occurred over areas along and south of the
I-10 corridor earlier today has diminished. Scattered showers and
thunderstorms were occurring along the northward and westward
moving outflow boundaries at 3:00 PM. Tweaked the rain chances
for the southwestern and northern counties for the rest of this
afternoon to account for these ongoing storms. Could see an
isolated shower or thunderstorm to redevelop to the south and
southeast but with the cirrus shield overhead think these will be
limited.

The deep layer weak trough overhead of SE Texas will likely linger
overhead one more day before the deep layer upper level ridge in
the Plains edges southward. This pattern should lead to slightly
warmer temperatures and less rain chances. On both Wednesday and
thursday the maximum heat indices could reach into the 105 to 107
for a lot of locations with some isolated locations reaching 108.
Do think that the best chances for rain will be on Wednesday;
however, enough moisture will linger overhead to keep daily shower
and thunderstorm chances in place for Thursday and Friday. By
Saturday the general upper level troughiness over the Atlantic
Region will again extend into the Upper Texas coastal areas. Both
the GFS and ECMWF show a 500 mb low pressure area over the Mid
Atlantic moving southwestward into at least the lower Mississippi
Valley during the weekend. Both models differ on the evolution of
this system early next week but both show the weak trough again
developing either overhead SE Texas or near the Upper Texas coast.
For this reason, kept daily chances for showers and thunderstorms
in place for most areas through Tuesday.

40

&&

.MARINE...
A light onshore flow is expected through the end of the week with high
pressure over the eastern Gulf and lower pressures over West Texas.
Night time winds will be slightly stronger especially toward the end of the
week as low pressure moves across the southern plains. Tide levels will
remain slightly elevated through the week but will remain below critical
thresholds. 43

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      75  96  76  97  77 /  20  10  10  20  10
Houston (IAH)              74  94  76  95  77 /  20  30  10  30  10
Galveston (GLS)            81  90  81  90  82 /  20  30  10  30  20

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&

$$

Discussion...40
Aviation/Marine...43



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