Area Forecast Discussion
Issued by NWS San Angelo, TX

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FXUS64 KSJT 202339
AFDSJT

Area Forecast Discussion
National Weather Service SAN ANGELO TX
539 PM CST Fri Jan 20 2017

.AVIATION...
/00Z TAFS/

VFR conditions expected through the next 24 hours. Winds have
diminished to around 10 knots or less this evening, and have lost
their gusts. Winds will pick up out of the southwest again by mid
to late morning on Saturday. Winds will pick up to between 20 and
25 knots sustained with gusts to around 30 knots at KSJT and KABI.
These winds should continue through the afternoon hours. There may
also be a few showers around during the afternoon hours which may
aid in producing gusts across the area. 20

&&

.PREV DISCUSSION... /issued 344 PM CST Fri Jan 20 2017/

SHORT TERM...
(Tonight and Saturday)

SHORT TERM...
(Tonight and Saturday)

Breezy southwest to west winds will weaken late this afternoon as
a surface low in SE Colorado moves northeast. Fairly benign
weather tonight. Lows will be mainly in the 40s...with lighter
winds and increasing mid and upper level cloudiness. A few low
lying and protected areas, however, may see upper 30s, especially
along the San Saba and Llano River Valleys.

Another upper low, however, will be developing in the Panhandle
Saturday, and strong southwest to west winds of 20 to 30 mph are
expected to develop late morning across the Concho Valley and Big
Country. Fire weather conditions will be elevated Saturday
afternoon, but relative humidity values are not expected to fall
below critical values of 20 percent.

A few light showers are possible Saturday, mainly in the
afternoon, as mid level moisture wraps around the upper low. Kept
mention of an isolated thunderstorm, but potential will be more on
the remote side with only weak instability present.

LONG TERM...
(Saturday Night through Friday)

Very windy conditions will increase even more on Saturday Night.
Rapidly developing surface low will significantly tighten the
pressure gradient. Both the GFS and the NAM show 65 to 70 knot
winds at 850 mb between midnight and sunrise Sunday morning. Given
the overnight conditions, not all of these winds will mix to the
surface, but some of it likely will. Strongest wind speeds look to
be south of a San Angelo to Brownwood line, where wind speeds may
gust 45 to 50 mph or more.

AS the low moves away, wind speeds should begin to decrease
through the day on Sunday. Temperatures at or above normal to
start the week off, before a cold front drops through the area
Tuesday night. Afternoon highs drop about 20 degrees, back into
the 50s for mid to late week.

&&

.PRELIMINARY POINT TEMPS/POPS...
Abilene  47  68  44  60 /   5  20   5   0
San Angelo  44  71  44  65 /   5  20   5   0
Junction  44  74  46  66 /   5  20  10   0
Brownwood  43  70  44  62 /   5  20  10   0
Sweetwater  46  65  43  60 /   5  20   5   0
Ozona       43  70  42  64 /   5  20   5   0

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
Lake Wind Advisory until 6 PM CST this evening for Brown-Coke-
Coleman-Concho-Haskell-Jones-McCulloch-Nolan-Runnels-Taylor-Tom
Green.

&&

$$



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