Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 87, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 21, 2011, 8:32 PM CDT for Burnet County, Texas. It was in force for 43 min. 9 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 21, 2011, 8:32 PM CDT (01:32 UTC)
- Expired
- May 21, 2011, 9:15 PM CDT
- In force
- 43 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
County Burnet County, TX
The radar
The Ft Hood radar (KGRK), 74 km from the middle of the area, began a volume at 01:34 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 21, 8:36 PM CDT | FUNNEL CLOUD | Burnet, TX | WALL CLOUD WITH ROTATION IN THE CITY OF BURNET. |
| May 21, 8:36 PM CDT | HAIL 2.75 | Burnet, TX | BASEBALL HAIL IN THE CITY OF BURNET. |
| May 21, 8:36 PM CDT | HAIL 4 | Burnet, TX | GRAPEFRUIT SIZE HAIL FALLING IN NORTH CENTRAL BURNET. |
| May 21, 8:40 PM CDT | HAIL 4.5 | Burnet, TX | 5 INCH HAIL MEASURED. |
| May 21, 8:42 PM CDT | HAIL 2.75 | 2 N Burnet, TX | GOLFBALL TO BASEBALL SIZE HAIL NEAR BURNET. |
| May 21, 8:48 PM CDT | HAIL 2.75 | Burnet, TX | |
| May 21, 8:53 PM CDT | HAIL 2 | Burnet, TX | MEASURED HAIL WITH 2.38 INCHES ACROSS. |
| May 21, 8:59 PM CDT | HAIL 1.75 | Burnet, TX | |
| May 21, 9:24 PM CDT | HAIL 1 | 1 N Bertram, TX |
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 |
|---|---|---|---|
| May 21, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 1.5 hours before the alert went out and 238 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
- 3908 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 978 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 16.6
The text
As transmitted, in the capitals the NWS used until 2016.
242 WUUS54 KEWX 220132 SVREWX TXC053-220215- /O.NEW.KEWX.SV.W.0087.110522T0132Z-110522T0215Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 832 PM CDT SAT MAY 21 2011 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL BURNET COUNTY... * UNTIL 915 PM CDT. * AT 824 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BURNET...AND MOVING EAST AT 15 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE SHADY GROVE...OATMEAL... BERTRAM AND JOPPA. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. && LAT...LON 3087 9798 3068 9808 3074 9837 3092 9832 TIME...MOT...LOC 0133Z 283DEG 15KT 3081 9824 $$
1 follow-up statement
240 WWUS54 KEWX 220159 SVSEWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 859 PM CDT SAT MAY 21 2011 TXC053-220215- /O.CON.KEWX.SV.W.0087.000000T0000Z-110522T0215Z/ BURNET TX- 859 PM CDT SAT MAY 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR CENTRAL BURNET COUNTY... AT 848 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING UP TO BASEBALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BURNET...MOVING EAST AT 15 TO 20 MPH. THIS STORM HAS ALREADY PRODUCED GOLF TO BASEBALL SIZE HAIL WITHIN THE PAST 30 MINUTES IN THE CITY BURNET. SOME LOCATIONS IN THE WARNING AREA INCLUDE SHADY GROVE...OATMEAL... JOPPA AND BERTRAM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. && LAT...LON 3083 9802 3068 9808 3073 9830 3086 9823 TIME...MOT...LOC 0157Z 288DEG 19KT 3077 9812 $$
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:10 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Travis, Williamson | 50 min |
| May 21, 7:27 PM CDT | Tornado Warning | EWX | Burnet, Williamson | 33 min |
| May 21, 7:44 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 min |
| May 21, 7:50 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 40 min |
| May 21, 7:59 PM CDT | Tornado Warning | EWX | Burnet, Williamson | 31 min |
| May 21, 8:08 PM CDT | Areal Flood Advisory | EWX | Burnet, Williamson | 112 min |
| May 21, 8:11 PM CDT | Tornado Warning | EWX | Burnet, Llano | 34 min |
| May 21, 8:27 PM CDT | Severe Thunderstorm Warning | EWX | Williamson | 48 min |
| May 21, 8:27 PM CDT | Tornado Warning | EWX | Williamson | 33 min |
| May 21, 8:44 PM CDT | Tornado Warning | EWX | Burnet | 31 min |
| May 21, 8:59 PM CDT | Tornado Warning | EWX | Williamson | 31 min |
| May 21, 9:14 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 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.