Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 76, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 20, 2011, 10:02 PM CDT for Bastrop County, Caldwell County, Texas. It was in force for 43 min. 5 reports 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
- May 20, 2011, 10:02 PM CDT (03:02 UTC)
- Expired
- May 20, 2011, 10:45 PM CDT
- In force
- 43 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
Counties Bastrop County, TX, Caldwell County, TX
The radar
The Austin/San Antonio radar (KEWX), 61 km from the middle of the area, began a volume at 03:05 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 10:17 PM CDT | HAIL 0.75 | 6 Wsw Cedar Creek, TX | HAIL AT LEGEND OAKS DRIVE AND HIGHWAY 21 IN CEDAR CREEK. |
| May 20, 10:17 PM CDT | HAIL 1.25 | 6 Wsw Cedar Creek, TX | HAIL AT LEGEND OAKS DRIVE AND HIGHWAY 21 IN CEDAR CREEK. |
| May 20, 10:26 PM CDT | HAIL 0.75 | 5 Wsw Cedar Creek, TX | HAILING PEA TO PENNY SIZED HAIL FOR THE LAST 10 MINUTES. |
| May 20, 10:32 PM CDT | HAIL 1 | 5 Se Cedar Creek, TX | PEA TO QUARTER SIZE HAIL. |
| May 20, 10:39 PM CDT | HAIL 0.5 | 5 Sse Cedar Creek, TX | PEA TO HALF INCH HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 3.0 hours before the alert went out and 252 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
- 4855 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 870 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 9.0
The text
As transmitted, in the capitals the NWS used until 2016.
546 WUUS54 KEWX 210302 SVREWX TXC021-055-210345- /O.NEW.KEWX.SV.W.0076.110521T0302Z-110521T0345Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1002 PM CDT FRI MAY 20 2011 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WEST CENTRAL BASTROP COUNTY... NORTHERN CALDWELL COUNTY... * UNTIL 1045 PM CDT. * AT 954 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR MENDOZA... OR 8 MILES NORTH OF LOCKHART...AND MOVING EAST AT 15 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE LYTTON SPRINGS...ST JOHN COLONY...DALE...MCMAHAN...BATEMAN...TAYLORSVILLE...ELM GROVE... ROCKNE...RED ROCK...HILLS PRAIRIE AND WATTERSON. LAT...LON 3006 9727 2983 9750 2994 9777 3007 9765 TIME...MOT...LOC 0302Z 287DEG 15KT 2998 9762 $$
1 follow-up statement
117 WWUS54 KEWX 210327 SVSEWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1027 PM CDT FRI MAY 20 2011 TXC021-055-210345- /O.CON.KEWX.SV.W.0076.000000T0000Z-110521T0345Z/ BASTROP TX-CALDWELL TX- 1027 PM CDT FRI MAY 20 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR NORTHERN CALDWELL AND WEST CENTRAL BASTROP COUNTIES... AT 1018 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 9 MILES NORTH OF HILLS PRAIRIE TO 10 MILES SOUTHWEST OF MENDOZA...OR ALONG A LINE EXTENDING FROM BASTROP TO 6 MILES WEST OF LOCKHART...MOVING EAST AT 10 MPH. SOME LOCATIONS IN THE WARNING AREA INCLUDE LYTTON SPRINGS...ST JOHN COLONY...DALE...MCMAHAN...TAYLORSVILLE...WATTERSON...ROCKNE...RED ROCK...BATEMAN AND ELM GROVE. PRECAUTIONARY/PREPAREDNESS ACTIONS... HAIL UP TO HALF DOLLAR SIZE HAS BEEN REPORTED 6 MILES WEST SOUTHWEST OF CEDAR CREEK WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY. && LAT...LON 3007 9761 3006 9727 2983 9750 2994 9777 TIME...MOT...LOC 0326Z 282DEG 9KT 3017 9733 2988 9776 $$
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:49 PM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Hays, Travis, Williamson | 41 min |
| May 20, 8:04 PM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Caldwell, Hays, Travis | 26 min |
| May 20, 8:27 PM CDT | Severe Thunderstorm Warning | EWX | Caldwell, Hays, Travis | 23 min |
| May 20, 8:58 PM CDT | Severe Thunderstorm Warning | EWX | Hays, Travis | 32 min |
| May 20, 8:59 PM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Lee, Travis, Williamson | 61 min |
| May 20, 9:22 PM CDT | Severe Thunderstorm Warning | EWX | Bastrop, Caldwell, Lee, Travis | 38 min |
| May 20, 10:32 PM CDT | Severe Thunderstorm Warning | EWX | Caldwell, Guadalupe, Hays | 43 min |
| May 21, 4:58 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano, Williamson | 47 min |
| May 21, 5:44 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 min |
| May 21, 6:00 PM CDT | Areal Flood Advisory | EWX | Burnet, Llano | 2 hr |
| May 21, 6:00 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 45 min |
| May 21, 6:29 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 min |
| May 21, 6:52 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 38 min |
| May 21, 6:59 PM CDT | Tornado Warning | EWX | Burnet | 31 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011
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.