Alert archive / Texas / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 31, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 12, 2021, 6:30 PM CDT for Llano County, Texas. It was in force for 60 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 12, 2021, 6:30 PM CDT (23:30 UTC)
- Expired
- Apr 12, 2021, 7:30 PM CDT
- In force
- 60 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Llano County, TX
The radar
The Ft Hood radar (KGRK), 138 km from the middle of the area, began a volume at 23:30 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 12, 7:05 PM CDT | HAIL 1.75 | 7 W Valley Spring, TX | GOLFBALL SIZE HAIL 4 MILES SOUTHEAST OF PONTOTOC ON COUNTY ROAD 405. 3 INCHES OF HAIL ACCUMULATION ON THE GROUND. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 12, 3:51 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 11.5 hours before the alert went out and 254 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
- 876 J/kg
- Mixed-layer CIN
- -408 J/kg
- Mixed-layer LCL
- 922 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
561
WUUS54 KEWX 122330
SVREWX
TXC299-130030-
/O.NEW.KEWX.SV.W.0031.210412T2330Z-210413T0030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
630 PM CDT Mon Apr 12 2021
The National Weather Service in Austin San Antonio has issued a
* Severe Thunderstorm Warning for...
Northwestern Llano County in south central Texas...
* Until 730 PM CDT.
* At 629 PM CDT, a severe thunderstorm was located near Art, or 9
miles northeast of Mason, moving northeast at 15 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Valley Spring and Field Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3080 9870 3078 9896 3092 9896 3092 9877
TIME...MOT...LOC 2329Z 240DEG 13KT 3083 9911
HAIL...1.25IN
WIND...60MPH
$$
YB1 follow-up statement
556
WWUS54 KEWX 130003
SVSEWX
Severe Weather Statement
National Weather Service Austin/San Antonio TX
703 PM CDT Mon Apr 12 2021
TXC299-130030-
/O.CON.KEWX.SV.W.0031.000000T0000Z-210413T0030Z/
Llano TX-
703 PM CDT Mon Apr 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHWESTERN LLANO COUNTY...
At 703 PM CDT, a severe thunderstorm was located over Pontotoc, or 17
miles northeast of Mason, moving northeast at 15 mph.
This is a very dangerous storm.
HAZARD...Baseball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Valley Spring and Field Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
&&
LAT...LON 3080 9870 3078 9896 3092 9896 3092 9877
TIME...MOT...LOC 0003Z 240DEG 13KT 3089 9899
HAIL...2.75IN
WIND...60MPH
$$
YBNearby
Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.