Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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145
FXUS64 KHGX 202036
AFDHGX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
336 PM CDT Thu Jul 20 2017

.DISCUSSION...
An upper level high pressure area will continue to build over the
state tonight and Friday. An upper level low over moving across
Florida today will move into Southeast Texas over the weekend. By
Monday weak riding aloft is expected to build through the first
half of the new work week.

A weak shear axis under the building ridge aloft will combine with
the sea breeze to generate isolated to scattered showers and
thunderstorms during the remainder of this afternoon into early
this evening. Expect that these will occur mainly from the I-10
corridor to the coastal areas. Still expect some rain chances on
Friday; although, the weak shear axis will become overwhelmed by
the build ridge. The maximum afternoon heat index should reach
between 103 and 107 this afternoon and on Friday.

Over the weekend the upper level trough will help generate good
chances for showers and thunderstorms on Saturday and Sunday. The
coverage and cloud cover will help to moderate the temperatures
and lead to lower heat indices each afternoon. After Sunday the
GFS and ECMWF both differ on the strength of the build ridge at
500 mb and its location. Even so, rainfall chances lower on both
models. With this in mind, kept isolated chances each day
beginning on Monday.

40

&&

.MARINE...
Light onshore winds and low seas will continue through the end of
the work week. As the pressure gradient tightens late Saturday and
into early next week, winds and seas will show a slight uptick, with
wind speeds possibly close to caution criteria during the late night
hours. 47

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      77  97  76  95  77 /  10  10  10  30  10
Houston (IAH)              77  96  78  92  79 /  20  20  10  50  20
Galveston (GLS)            81  91  83  89  83 /  20  20  20  50  20

&&

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

$$

Discussion...99
Aviation/Marine...47



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