Area Forecast Discussion
Issued by NWS Austin/San Antonio, TX

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328
FXUS64 KEWX 220859
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
359 AM CDT Tue May 22 2018

.SHORT TERM (Today through Wednesday)...
Showers and thunderstorms along the Texas/New Mexico border extending
south to the Big Bend and into Mexico are moving east. This activity
is being fed by a moist southeasterly lower level flow. Although, it
will encounter a capping inversion further east due to a building mid
and upper level ridge, it may survive long enough to move into the
Val Verde county area today and have maintained POPs for that area.
The moist flow from the Coastal Plains into the Escarpment may
generate streamer showers this morning as indicated by hi-res models
and have introduced slight chance POPs for those areas. The mid and
upper level ridge slowly builds over our area. However, the capping
inversion is weak enough to allow the seabreeze to generate
afternoon showers and thunderstorms across areas mainly east of I-35
each day. Any storms may produce gusty winds and brief heavy
downpours. Near normal temperatures today creep slightly above normal
on Wednesday.

&&

.LONG TERM (Wednesday Night through Monday)...
The mid and upper level ridge continues to strengthen over our area
later this week into the Memorial Day weekend as a deepening low
pressure system at the surface and aloft moves across the Central
Gulf of Mexico into the Central Gulf Coast. Initially, some moisture
lingers across the far east along the Highway 77 corridor. This may
allow isolated showers and thunderstorms to develop during the
afternoon hours of Thursday through Saturday. A slight drying trend
as Gulf moisture decreases due to weak surface ridging along with
good mixing of warming mid level temperatures (850 MB temperatures
of 19C to 24C warming to 24C to 30C) enables surface temperatures to
warm, as well. Expect highs around 100 or so along the Rio Grande
during the weekend, spreading to the I-35 corridor from San Antonio
south on Memorial Day.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              89  70  91  71  93 /  20  -   10  -   10
Austin Bergstrom Intl Airport  88  69  90  68  92 /  20  -   10  -   10
New Braunfels Muni Airport     89  69  91  69  92 /  20  -   10  -   10
Burnet Muni Airport            87  68  88  68  91 /  10  -   10  -   10
Del Rio Intl Airport           92  72  93  72  95 /  20  -   -   -   -
Georgetown Muni Airport        88  69  89  69  91 /  20  10  10  10  10
Hondo Muni Airport             91  69  92  69  94 /  10  -   -   -   -
San Marcos Muni Airport        89  69  90  68  92 /  20  -   10  -   10
La Grange - Fayette Regional   89  70  91  69  92 /  40  10  20  10  10
San Antonio Intl Airport       89  71  90  71  92 /  10  -   10  -   -
Stinson Muni Airport           91  71  92  71  95 /  10  -   10  -   -

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

Mesoscale/Aviation...10
Synoptic/Grids...04



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