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

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299
FXUS64 KEWX 202344
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
644 PM CDT Tue Jun 20 2017

.AVIATION...
VFR conditions are expected at all terminals through the period.
Northeast winds this evening will subside overnight before picking up
again tomorrow out of the north-northeast. Winds tomorrow afternoon
could reach up into the 10 to 15 knots range. Some mid and high level
clouds associated with the western fringe of Tropical Storm Cindy
could begin to filter into Central Texas tonight and tomorrow, but
these should stay above four thousand feet.

&&

.PREV DISCUSSION... /ISSUED 337 PM CDT Tue Jun 20 2017/

SHORT TERM (Tonight through Wednesday Night)...
The short term portion of the forecast will generally remain hot and
dry across all of south central Texas. Afternoon highs through
tomorrow will remain a few degrees above normal across all areas with
lower 90s in the Hill Country to near 100 along the Rio Grande. A few
afternoon showers and storms are possible along the Highway 77
corridor and coastal plains Wednesday afternoon. For now, we will
keep any rain chances fairly low as we only expect isolated activity
during the afternoon and early evening.

LONG TERM (Thursday through Tuesday)...
The forecast for late in the week will depend on the path of
Tropical System Cindy. For now, it appears the best chance for
rainfall will remain near the Highway 77 corridor on Thursday.
Precipitable water values climb into the 2-2.5" range across the
mentioned region and we could see some locally heavy rainfall along
and east of the Highway 77 corridor based on the current forecast
track. Rainfall chances should begin to decrease on Friday and for
now we will only show a slight chance for rain along the Highway 77
corridor, with dry conditions elsewhere. We will need to keep an eye
on increasing heat index values on Friday. For now, it appears areas
along and east of I-35 and south of Highway 90 will see values of 105
to near 108 degrees.

The forecast for the upcoming weekend will depend largely on the
southward progress of a weak cold front set to move into north and
possibly central Texas. While some differences with regards to the
timing and strength of this front are noted, we do expect a chance
for showers and thunderstorms across most areas this weekend.
Convection will also be aided by an increase in moisture along with
some weak upper level disturbances across the region. Confidence in
the forecast for early next week is fairly low at this time. However,
given the northwest flow aloft we will keep a low chance for showers
and storms on Monday. For now, a dry forecast is expected Tuesday as
the subtropical ridge axis begins to build in from the west.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              96  74  96  75  92 /  -    0  -   -   20
Austin Bergstrom Intl Airport  96  72  96  74  91 /  -    0  -   -   20
New Braunfels Muni Airport     98  73  96  73  95 /  -    0  -   -   10
Burnet Muni Airport            93  70  93  71  93 /  -    0   0  -   -
Del Rio Intl Airport           99  76 101  73 102 /  -    0   0   0   0
Georgetown Muni Airport        94  71  94  73  91 /  -    0  -   -   20
Hondo Muni Airport             99  72  99  71  98 /  -    0   0   0  -
San Marcos Muni Airport        97  73  96  74  93 /  -    0  -   -   10
La Grange - Fayette Regional   96  75  94  75  89 /  -   -   20  20  50
San Antonio Intl Airport       97  75  97  74  97 /  -    0   0  -   -
Stinson Muni Airport           99  76  99  74  98 /  -    0   0  -   -

&&

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

$$

Mesoscale/Aviation...Treadway
Synoptic/Grids...TB3
Public Service/Data Collection...30



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