620
FXUS64 KSJT 040547
AFDSJT

Area Forecast Discussion
National Weather Service San Angelo TX
1247 AM CDT Sat May 4 2024

...New AVIATION...

.SHORT TERM...
(This evening through Saturday)
Issued at 204 PM CDT Fri May 3 2024

...Severe thunderstorms expected again this afternoon and
evening...

A very moist and unstable airmass persists across the area again
this afternoon. A dryline is located across far West Texas, with
a residual outflow boundary bisecting the forecast area from
northwest to southeast. Strong to extreme instability exists
across the area per latest SPC mesoanalysis, with MLCAPE`s
3500-4500 J/kg. Deep layer shear is not particularly strong (0-6
km shear around 25 kts) but sufficient for supercells and intense
updrafts given the degree of instability. As of 2 PM, visible
satellite imagery already shows an agitated cumulus field across
western portions of the Big Country and northwest Concho Valley.
Latest HRRR develops convection across this area by 21Z (4pm
local), with storms expanding in coverage and tracking east across
the area during the evening hours. Very large to possibly giant
hail, damaging winds and a few tornadoes will be possible.
As storms progress eastward with time, the main hazard will
transition to damaging winds, although large hail will still be
a concern. In addition to the severe threat, precipitable water
values near 1.5 inches will support torrential downpours, which
may lead to some localized flooding.

The airmass will remain very moist and unstable again for
Saturday ahead of a weak cold front and a shortwave trough
approaching from the west. Models still show fairly widespread
thunderstorm development across West Central Texas by afternoon
along the weak front, which should be situated across the Big
Country. Thunderstorms are expected to expand in coverage by late
afternoon and early evening. There is yet another risk for severe
storms tomorrow, primarily south of the surface cold front and
maximized across western portions of the Concho Valley and farther
west across the Permian Basin, where SPC now has an enhanced
risk. A slight risk exists across the remainder of West Central
Texas. Shear is expected to be stronger tomorrow, especially
during the evening hours, which will support tornadoes, some
possibly strong within the enhanced risk area. Otherwise, large
hail, damaging winds and isolated tornadoes are possible mainly
through the evening hours, with damaging winds becoming the main
threat overnight as storms push eastward with time. Heavy rainfall
is again possible tomorrow afternoon/evening, which may result in
some localized flooding.

&&

.LONG TERM...
(Saturday night through next Friday)
Issued at 222 PM CDT Fri May 3 2024

By early evening Saturday, numerous showers and thunderstorms will
be ongoing across much of the area. The primary points of
development will be along a weak front that will be stalled across
the region and to our west along the dryline. Eventually, expect the
storms to congeal into a slow moving mesoscale convective system
(MCS) and slowly move south or southeast across the region. Strong
to severe thunderstorms will be possible, with large hail and
damaging winds being the main concerns, although a tornado is also
possible. In addition, locally heavy rainfall will be possible,
especially given the expected slow movement of the storms. Some
flooding will be possible, especially in low lying areas, low water
crossings, and on roadways. Overnight lows will be in the upper 50s
to lower 60s. On Sunday, the remnant cold front will remain in the
area, so additional showers and thunderstorms are possible. Most of
the activity should dissipate by mid to late evening.

Drier and hotter conditions are expected for next week. Highs on
Monday will approach 90, with highs Tuesday into the low to mid 90s.
The hottest temperatures are forecast on Wednesday with highs
approaching the upper 90s in our southern counties. A weak cold
front will move into the region Thursday, ushering in slightly
cooler temperatures. Highs will be in the 80s across the northern
half of the area to the low to mid 90s across the southern half of
the area.

&&

.AVIATION...
(06Z TAFS)
Issued at 1246 AM CDT Sat May 4 2024

VFR conditions currently present across the area. MVFR to IFR
ceilings are expected to build back in over the next few hours,
impacting all terminals. Some sites, primarily KJCT and KBBD, may
see visibility reductions, likely to the MVFR category, overnight
into mid morning hours. Skies will start to clear from SW to NE
after 15Z tomorrow, though our far eastern sites may not see CIGs
lift past high-end MVFR. Showers and storms will be possible yet
again during the afternoon and evening hours. They will initially
start out more scattered in nature before developing into a more
solid cluster of storms. Have given a best guess on timing based
on current hi-res trends but this will likely need to be adjusted
with future updates.

&&

.PRELIMINARY POINT TEMPS/POPS...
Abilene     79  61  78  65 /  80  90  10  10
San Angelo  86  61  79  66 /  60  90  40  10
Junction    88  64  81  67 /  30  80  50  10
Brownwood   80  62  77  65 /  60  90  20  20
Sweetwater  79  61  76  66 /  80  90  10  10
Ozona       84  62  78  66 /  40  90  50  10
Brady       82  62  76  66 /  60  90  40  20

&&

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

$$

SHORT TERM...24
LONG TERM....Daniels
AVIATION...50