Alert archive / Texas / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 63, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 6, 2012, 7:33 PM CDT for Llano County, Texas. It was in force for 42 min. 2 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 6, 2012, 7:33 PM CDT (00:33 UTC)
- Expired
- May 6, 2012, 8:15 PM CDT
- In force
- 42 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
County Llano County, TX
The radar
The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 00:36 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 6, 7:38 PM CDT | HAIL 1.75 | 2 W Llano, TX | QUARTER TO GOLFBALL SIZE SIZE HAIL. |
| May 6, 7:46 PM CDT | HAIL 1.75 | 3 Se Llano, TX | GOLFBALL SIZE HAIL IN DRIFTS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 0.6 hours before the alert went out and 253 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
- 1964 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 2142 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -28 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
839 WUUS54 KEWX 070033 SVREWX TXC299-070115- /O.NEW.KEWX.SV.W.0063.120507T0033Z-120507T0115Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 733 PM CDT SUN MAY 6 2012 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL LLANO COUNTY... * UNTIL 815 PM CDT. * AT 731 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 LLANO...AND MOVING SOUTH AT 15 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE OXFORD. PRECAUTIONARY/PREPAREDNESS ACTIONS... HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED IN AND AROUND LLANO WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY. && LAT...LON 3051 9853 3052 9881 3077 9877 3075 9857 TIME...MOT...LOC 0033Z 357DEG 12KT 3068 9867 $$
1 follow-up statement
937 WWUS54 KEWX 070049 SVSEWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 749 PM CDT SUN MAY 6 2012 TXC299-070115- /O.CON.KEWX.SV.W.0063.000000T0000Z-120507T0115Z/ LLANO TX- 749 PM CDT SUN MAY 6 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR SOUTH CENTRAL LLANO COUNTY... AT 746 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR OXFORD...OR 8 MILES SOUTH OF LLANO...MOVING SOUTH AT 15 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... QUARTER TO GOLF BALL SIZED HAIL HAS BEEN REPORTED 2 MILES WEST OF LLANO WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY. && LAT...LON 3071 9878 3070 9856 3051 9853 3052 9881 TIME...MOT...LOC 0048Z 357DEG 12KT 3063 9867 $$
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 7:09 PM CDT | Areal Flood Advisory | EWX | Llano | 111 min |
| May 7, 3:28 AM CDT | Flash Flood Watch | EWX | Bandera, Bexar, Blanco, Burnet, Comal, Edwards and 12 more | 37 hr |
| May 7, 4:47 PM CDT | Severe Thunderstorm Warning | EWX | Llano | 58 min |
| May 7, 5:10 PM CDT | Tornado Warning | EWX | Llano | 35 min |
| May 7, 5:23 PM CDT | Severe Thunderstorm Warning | EWX | Llano | 37 min |
| May 7, 5:32 PM CDT | Tornado Warning | EWX | Gillespie, Llano | 28 min |
| May 7, 5:43 PM CDT | Tornado Warning | EWX | Llano | 32 min |
| May 7, 5:57 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Burnet, Gillespie, Llano | 63 min |
| May 7, 6:08 PM CDT | Areal Flood Advisory | EWX | Llano | 112 min |
| May 7, 6:49 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Gillespie, Kendall | 56 min |
| May 7, 6:51 PM CDT | Areal Flood Advisory | EWX | Gillespie | 2 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 2012Every severe thunderstorm warning in 2012
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.