Alert archive / Texas / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 135
The Storm Prediction Center issued this severe thunderstorm watch at May 3, 2021, 7:01 PM CDT for 15 counties in Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 3, 2021, 7:01 PM CDT (00:01 UTC)
- Expired
- May 3, 2021, 11:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
Counties Atascosa County, TX, Bandera County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Comal County, TX, Frio County, TX, Gillespie County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Llano County, TX, Medina County, TX, Wilson County, TX
The radar
The Austin/San Antonio radar (KEWX), 60 km from the middle of the area, began a volume at 00:05 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 7:12 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Comal, Medina | 63 min |
| May 3, 7:14 PM CDT | Severe Thunderstorm Warning | EWX | Bandera, Bexar, Blanco, Gillespie, Kendall, Kerr and 1 more | 61 min |
| May 3, 7:49 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Comal, Guadalupe | 56 min |
| May 3, 8:12 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Gillespie, Kendall, Llano | 48 min |
| May 3, 8:23 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Guadalupe, Wilson | 22 min |
| May 3, 8:43 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Gonzales, Guadalupe, Wilson | 62 min |
| May 3, 8:58 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Llano, Travis, Williamson | 62 min |
| May 3, 9:16 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano, Travis, Williamson | 41 min |
| May 3, 10:08 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 30 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 0.0 hours before the alert went out and 232 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4428 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -50 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
562
WWUS20 KWNS 032356
SEL5
SPC WW 032356
TXZ000-040400-
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 135
NWS Storm Prediction Center Norman OK
700 PM CDT Mon May 3 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Part of the Texas Hill Country
* Effective this Monday evening from 700 PM until 1100 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 3
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Isolated splitting supercells will be possible through
late evening, with the potential for very large hail and damaging
winds.
The severe thunderstorm watch area is approximately along and 25
statute miles east and west of a line from 95 miles north of San
Antonio TX to 65 miles south southwest of San Antonio TX. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 128...WW 130...WW
131...WW 132...WW 133...WW 134...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 600. Mean storm motion vector
27010.
...ThompsonSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 7:38 PM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Dallas, Denton, Ellis, Fannin and 6 more | 97 min |
| May 3, 8:30 PM CDT | Mesoscale Discussion | SPC | Bexar, Blanco, Comal, Guadalupe, Hays, Kendall | 60 min |
| May 3, 8:38 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Marion, Morris and 4 more | 2 hr |
| May 3, 9:10 PM CDT | Mesoscale Discussion | SPC | Callahan, Eastland, Fisher, Haskell, Jones, Nolan and 6 more | 95 min |
| May 3, 9:10 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more | 7 hr |
| May 3, 9:52 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Coryell, Ellis, Falls, Freestone and 12 more | 53 min |
| May 3, 10:22 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Collin, Cooke, Dallas, Delta and 28 more | 5 hr |
| May 3, 11:34 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Falls, Franklin, Freestone and 12 more | 86 min |
| May 4, 6:44 AM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Brazos, Burleson, Camp, Cass and 23 more | 2 hr |
| May 4, 8:11 AM CDT | Severe Thunderstorm Watch | SPC | Angelina, Austin, Brazos, Burleson, Chambers, Colorado and 22 more | 8 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2021Every severe thunderstorm watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.