-- Discussion containing changed information from previous version are highlighted. --
614
FXUS64 KSJT 211855
AFDSJT

Area Forecast Discussion
National Weather Service San Angelo TX
155 PM CDT Sat Sep 21 2024

...New LONG TERM...

.SHORT TERM...
(Today and tonight)
Issued at 425 AM CDT Sat Sep 21 2024

All of our models continue to depict a similar setup for this
afternoon and evening. A low pressure system will continue moving
east across Arizona and New Mexico. The high pressure across our
region of west Central Texas will keep hot and dry conditions in
place. The center of the high will shift to the southeast.
However, this will not be enough to see any potential rainfall
develop as the rain will remain to our northwest. A dry forecast
with highs in the middle 90s will be the main highlight for today.

&&

.LONG TERM...
-- Changed Discussion --
(Sunday night through next Saturday)
Issued at 153 PM CDT Sat Sep 21 2024

...Rain chances and cool temperatures to continue through
Wednesday. Drier with a slow warming trend expected Thursday into
the weekend...

An upper low over Colorado is expected to open into a trough as it
moves into the Central Great Plains late Sunday into Monday. This
will put our area in the troughing regime with an upper high
generally located to our southeast along the Texas Gulf Coast. At
the surface, a cold front will be pushing into our area with showers
and storms ongoing by 00Z Monday. The front will progress through
most of the area by 12Z Monday. There is expected to be a lull in
activity for much of day on Monday as the front slowly retreats back
to the north and zonal flow aloft prevails. Isolated to scattered
chances for precipitation remains as an embedded shortwave impulse
aloft cannot be ruled out. Convective activity begins to ramp back
up Tuesday as a weak secondary trough is expected to develop just to
our north and west with the frontal boundary still in our general
area. Moisture will still be abundant with above normal pWats across
the area in the 1.4+ inch range. This activity will not be as
focused along the front (as compared to Sunday) and is expected to
be more scattered in nature leading to widespread chance PoPs
through early Wednesday. As the surface forcing begins to weaken
across our area with the front pushing south, activity will become
more nebulous and should eventually come to an end by late
Wednesday. Temperatures during this timeframe will be well below
normal for this time of year with highs Monday and Wednesday being
the coolest in the mid 70s to low 80s. Highs Tuesday will be a bit
warmer with the front drifting back north in the low to mid 80s.
Overnight lows will be cool in the upper 50s to mid 60s.

Uncertainty in the upper pattern begins to take shape later in the
week. Mid range models tend to agree that an upper low will drop out
of the Upper Plains and Midwest by late Wednesday into Thursday and
should stall out. Where exactly the low stalls out remains a point
of contention. The general consensus though is that much drier air
will filter in behind the cold front Wednesday and that West Central
Texas will be on the backside of this upper low in an area of
greater subsidence. Most ensemble members of both the GFS and ECMWF
keep our area free of precipitation from Thursday through next
weekend. We will see a gradual warming trend, largely due to the 850
mb thermal ridge slowly working its way back into our area as we
will still be seeing a dry northerly wind at the surface. Highs will
be in the low to mid 80s with overnight lows getting slightly cooler
in the mid 50s to low 60s.
-- End Changed Discussion --

&&

.AVIATION...
(18Z TAFS)
Issued at 1250 PM CDT Sat Sep 21 2024

VFR conditions expected through much of tonight, with MVFR
ceilings expected across the southern terminals after 10Z,
as stratus develops. Stratus should persist through the late
morning/early afternoon hours, so will keep MVFR ceilings in the
forecast through 18Z. Expect south winds gusting to around 20
knots this afternoon, diminishing by early evening. A cold front
will approach from the north tomorrow but will not impact the
terminals until late tomorrow afternoon and evening.

&&

.PRELIMINARY POINT TEMPS/POPS...
Abilene     73  89  58  77 /   0  60  70  20
San Angelo  73  91  61  78 /   0  50  80  30
Junction    70  91  65  83 /   0  10  40  30
Brownwood   71  92  63  80 /   0  20  50  30
Sweetwater  74  87  58  77 /  10  70  70  20
Ozona       72  88  63  78 /   0  30  70  40
Brady       70  91  64  79 /   0  20  50  30

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...41
LONG TERM....50
AVIATION...24