Severe Thunderstorm Warning 103, NWS Austin/San Antonio, TX

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
809 PM CDT Thu May 9 2024

...New MESOSCALE UPDATE...

.MESOSCALE UPDATE FOR SEVERE THUNDERSTORM WATCH 224...
Issued at 803 PM CDT Thu May 9 2024

Hi-res models show convection continuing to grow downstream of
current storms and we have expanded the Severe Thunderstorm Watch to
Comal, Guadalupe, Gonzales, and Fayette Counties. Storms should
continue for at least the next few hours. If the models are correct,
we shouldn't need to expand any farther.

&&

.SHORT TERM...
(Tonight through Friday night)
Issued at 340 PM CDT Thu May 9 2024

Early this afternoon a surface cold front stretched from north Texas
into a triple point in west central Texas with the dryline extending
south from there. Very humid and warm conditions exists south of the
cold front and east of the dryline, along with very unstable
conditions above the cap. The cap is still present on ACARS soundings
out of AUS, but has shown initial signs of a weakening trend. The
strong surface heating should continue this trend into the late
afternoon across the Hill Country and Austin metro area. CAMs have
been indicating upstream convection along the aforementioned surface
features to enter Llano and Burnet counties after 5 PM and into the
Austin metro area after 7 PM. A few WoFS members are initiating
convection ahead of the dryline as far south as Medina and Kendall
after 5 PM. MLCAPE values are forecast to be an impressive 3500-4500
J/kg south of the cold front and east of the dryline, and with
sufficient effective bulk shear values isolated storms developing
into or over the Hill Country and into the I-35 corridor near Austin
will be very capable of producing very large hail and damaging
straight-line winds. An isolated tornado can't be ruled out. A Level
2-3 out of 5 risk for severe storms is still in place for this area.
It's less certain how far south the storms can make it into the mid
and late evening as convective inhibition begins to build into the
Coastal Plains and San Antonio metro area, but we will watch these
areas closely. The storms are eventually forecast to weaken and
dissipate late evening east of I-35 and north of I-10.

The cold front is forecast slip through most of the central and
eastern areas tonight. Drier and "cooler" air will be in place for
Friday. The front should also help to sweep a lot of the haze out of
the area, which has partially been caused by background residual
smoke in the air originating from seasonal burnings in Mexico and
Central America.

The cold front is forecast to hang up along the Rio Grande Friday
morning. Models have been consistent with developing convection
across this region midday Friday, with downstream development and
propagation back into the western Hill Country and possibly San
Antonio metro area in the afternoon. Isolated strong to severe
storms could be possible Friday afternoon into the early evening.
SPC has placed portions of the Rio Grande, southern Edwards Plateau,
western Hill Country, and San Antonio metro area in a Level 1 out of
5 risk for severe storms Friday, with large hail the primary risk.

Finally, temperatures this afternoon across western areas along the
Rio Grande and south of U.S. 90 will top out around 100-105 degrees,
with mid 90s into the western Hill Country, San Antonio metro, and
inland Coastal Plains. East of the dryline, these temperatures
combined with the humidity may cause heat illness for those that are
not acclimated to the early season heat or are not taking proper
heat precautions. We have issued a Special Weather Statement for
this. High temperatures Friday are forecast to range from the low to
mid 80s north of I-10 to upper 80s to low 90s south.

&&

.LONG TERM...
(Saturday through Thursday)
Issued at 340 PM CDT Thu May 9 2024

A period of active weather will likely continue across portions of
the long-term portion of the forecast. However, wide spread chances
for significant severe weather will not be as high this weekend as
in the short-term. A subtle disturbance will move into the area this
weekend providing some lift for a 20-40 percent chance of showers
and isolated storms mainly out west Saturday. This activity will
transition into much of the remainder of the forecast area for
Sunday with increasing PoPs. Overall, instability amounts will be
meager but given the convective season, can't completely rule out a
strong storm at times during the weekend. Rain amounts for the
weekend will likely average a half an inch or less for most
locations but some isolated higher amounts will also be possible.

For early next week, a weak boundary may bring additional rain
chances to portions of the CWA on Monday. If this were to verify
some severe weather may be possible as instability amounts are
expected to increase. After probable dry weather on Tuesday, another
disturbance could bring additional chances of thunderstorms
Wednesday evening. Highs this weekend will mostly be in the 70s and
80s but will return into the 80s and 90s next week.

&&

.AVIATION...
(00Z TAFS)
Issued at 622 PM CDT Thu May 9 2024

Isolated thunderstorms have developed and will move across the
northern part of the area over the next few hours. Storms may impact
AUS between about 01Z and 04Z. They could produce wind gusts up to 35
kts and large hail. Storms are unlikely at the other terminals.
Beyond the evening storms, winds will shift to the northeast late
this evening. MVFR ceilings will develop overnight at all terminals
after midnight. Wind speeds will increase by late morning Friday
with gusts of 20 to 25 kts possible. VFR conditions will return by
early afternoon.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              70  85  65  82 /  40  10  10  10
Austin Bergstrom Intl Airport  70  83  65  81 /  40  10  10  10
New Braunfels Muni Airport     71  86  67  84 /  30  10  10  20
Burnet Muni Airport            66  81  63  78 /  40  10  10  20
Del Rio Intl Airport           76  89  72  86 /  10  60  40  40
Georgetown Muni Airport        67  81  63  79 /  50  10  10  20
Hondo Muni Airport             72  87  68  83 /  10  20  10  20
San Marcos Muni Airport        70  84  65  82 /  30  10  10  10
La Grange - Fayette Regional   72  86  67  82 /  30  10  10  10
San Antonio Intl Airport       72  86  68  82 /  20  20  10  20
Stinson Muni Airport           74  87  69  84 /  10  20  10  20

&&

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

Short-Term...76
Long-Term...29
Aviation...05

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
512 AM CDT Thu May 9 2024

TXZ171>173-183>194-202>209-217>225-228-101015-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
512 AM CDT Thu May 9 2024

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...Today And Tonight.

Areas of fog can be expected across south central Texas this
morning. Some dense fog is possible from the Hill Country into
the Interstate 35 corridor.

There is a risk for strong to severe storms for areas along and
northeast of a Rocksprings to San Antonio to Cuero line this
afternoon and evening. Large, possibly very large hail and
damaging winds are the main severe weather threats. In addition, a
tornado can't be ruled out.

Hot and humid conditions continue today, with high temperatures
ranging from near 90 to near 106 across the Rio Grande Plains.
Heat index values up to 108 are expected with the highest values
near the Coastal Plains.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated at this time.

Special Weather Statement
National Weather Service Austin/San Antonio TX
810 PM CDT Thu May 9 2024

TXZ190-191-206-100200-
Comal TX-Blanco TX-Hays TX-
810 PM CDT Thu May 9 2024

...A strong thunderstorm will impact portions of southwestern Hays,
south central Blanco and eastern Comal Counties through 900 PM CDT...

At 810 PM CDT, Doppler radar was tracking a strong thunderstorm over
Fischer, or 10 miles northwest of Canyon Lake Dam, moving southeast
at 35 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
New Braunfels, San Marcos, Wimberley, Canyon Lake Dam, Canyon Lake,
Twin Sisters, Fischer, Payton, Hunter, Gruene, Startzville, and
Sattler.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Texas.

&&

LAT...LON 3001 9844 3014 9832 2982 9793 2968 9816
TIME...MOT...LOC 0110Z 313DEG 30KT 3000 9827

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

CP

Special Weather Statement
National Weather Service Austin/San Antonio TX
812 PM CDT Thu May 9 2024

TXZ172-100200-
Burnet TX-
812 PM CDT Thu May 9 2024

...A strong thunderstorm will impact portions of southwestern Burnet
County through 900 PM CDT...

At 812 PM CDT, Doppler radar was tracking a strong thunderstorm near
Burnet, moving southeast at 30 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Burnet, Marble Falls, Meadowlakes, Longhorn Cavern State Park,
Smithwick, Oatmeal, and Cottonwood Shores.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Texas.

&&

LAT...LON 3065 9803 3062 9805 3047 9828 3067 9836
      3085 9828
TIME...MOT...LOC 0112Z 327DEG 24KT 3072 9829

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

CP

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