643
FXUS64 KEWX 210620
AFDEWX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
120 AM CDT Fri Jun 21 2024

...New SHORT TERM, LONG TERM...

.SHORT TERM...
(Today through Saturday)
Issued at 120 AM CDT Fri Jun 21 2024

The center of the Subtropical Ridge begins to shift to the southwest
toward Texas today. With the Ridge approaching, subsidence is still
minimal while a tropically moist airmass remains. Isolated to
scattered showers and thunderstorms should develop with heating.
Cannot rule out a few locally heavy downpours. High temperatures
remain slightly below normal due to the clouds and increased soil
moisture. Showers and thunderstorms will dissipate with loss of
heating after sunset this evening.

The Subtropical Ridge moves nearly overhead on Saturday bringing a
subsident airmass while another tropical disturbance deepens over
the southwestern Gulf of Mexico. NHC shows a 60% chance of tropical
cyclone development. The resultant northeasterly flow aloft will
bring a drier airmass over most of our area. Thus, only a few
showers and thunderstorms are possible over our far southern areas
closer to the deeper moisture. Temperatures warm to near normal
under less cloudiness.

&&

.LONG TERM...
(Saturday night through Thursday)
Issued at 120 AM CDT Fri Jun 21 2024

The upper level ridge across the eastern U.S. is forecast to
gradually expand back west into much of Texas this weekend. To the
south of the ridge, a broad area of low pressure is forecast to form
over southeastern Mexico and northern Central America today. The
National Hurricane Center is monitoring this system for tropical
cyclone development over the southwestern Gulf of Mexico this
weekend. The system is expected to move northwest into Mexico late
in the weekend and into Monday. Beneath the ridge, the outer fringes
of the deeper tropical moisture associated with this system is
forecast to make into South Texas, and perhaps as far north as
southern areas of our forecast area. If this happens, isolated
tropical showers and thunderstorms could develop during the day
Sunday and Monday, mainly south of the U.S. 90 and I-10 corridor.

The upper level ridge is then forecast to build into the southwest
U.S. and amplify Tuesday through Thursday. Low and high temperatures
are forecast to increase during this time. Humid conditions are also
expected, and with the elevated dew points we will watch closely for
heat index values pushing near Heat Advisory Criteria across much of
the region Tuesday through Thursday, excluding the Hill Country. The
forecast is mostly dry during this time frame.

&&

.AVIATION...
(06Z TAFS)
Issued at 1220 AM CDT Fri Jun 21 2024

MVFR CIGs will gradually spread across much of South Central Texas
overnight with SHRA in the VCNTY at KSAT thru 08Z. CIGs mix to SCT
VFR by midday Friday. SCT SHRA/TSRA will develop and have maintained
PROB30s for TSRA at all sites for the afternoon into early evening.
Easterly winds will prevail at 4 to 10 KTs overnight, then gradually
veer to southeasterly on Friday into Friday night.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              92  74  95  73 /  20   0   0   0
Austin Bergstrom Intl Airport  91  72  93  71 /  20  10   0   0
New Braunfels Muni Airport     91  73  93  71 /  30  20  10   0
Burnet Muni Airport            89  73  92  72 /  10   0   0   0
Del Rio Intl Airport           92  76  95  77 /  30  10  10   0
Georgetown Muni Airport        91  72  93  72 /  10   0   0   0
Hondo Muni Airport             89  73  91  71 /  30  20  10   0
San Marcos Muni Airport        89  71  92  70 /  20  20   0   0
La Grange - Fayette Regional   89  73  91  71 /  30  10   0   0
San Antonio Intl Airport       89  74  93  72 /  30  20  10   0
Stinson Muni Airport           91  75  93  73 /  30  20  10   0

&&

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

&&

$$

Short-Term...04
Long-Term...76
Aviation...04