Alert archive / Texas / Tornado Warnings in 2011
Tornado Warning 79, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at Jun 21, 2011, 4:55 PM CDT for Nacogdoches County, San Augustine County, Shelby County, Texas. It was in force for 35 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
- Jun 21, 2011, 4:55 PM CDT (21:55 UTC)
- Expired
- Jun 21, 2011, 5:30 PM CDT
- In force
- 35 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Nacogdoches County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Shreveport radar (KSHV), 86 km from the middle of the area, began a volume at 21:57 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 |
|---|---|---|---|
| Jun 21, 5:00 PM CDT | TORNADO | 3 W Center, TX | AN EF0 TORNADO TOUCHED DOWN TO THE NORTHWEST OF ARCADIA ALONG COUNTY ROAD 4060. AS IT TRAVELED TO THE SOUTHWEST IT SNAPPED TREES AND BRANCHES ALONG FM ROAD 138...BEFORE LIFTING. THE TORNADO TRACK WAS 1.5 MILES LONG AND MAXIMUM WINDS WERE 70-75 MPH. |
| Jun 21, 5:40 PM CDT | HAIL 1.75 | 6 S Center, TX |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 9.9 hours before the alert went out and 93 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
- 0 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.6
The text
As transmitted, in the capitals the NWS used until 2016.
705 WFUS54 KSHV 212155 TORSHV TXC347-405-419-212230- /O.NEW.KSHV.TO.W.0079.110621T2155Z-110621T2230Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 455 PM CDT TUE JUN 21 2011 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... NORTHEASTERN NACOGDOCHES COUNTY IN EASTERN TEXAS... NORTHWESTERN SAN AUGUSTINE COUNTY IN EASTERN TEXAS... SHELBY COUNTY IN EASTERN TEXAS... THIS INCLUDES THE CITY OF CENTER... * UNTIL 530 PM CDT * AT 452 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 11 MILES WEST OF CENTER...MOVING SOUTHEAST AT 25 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SHELBYVILLE AND NEUVILLE... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. && LAT...LON 3176 9394 3148 9435 3181 9448 3192 9436 TIME...MOT...LOC 2155Z 315DEG 20KT 3179 9435 $$ 09
1 follow-up statement
290 WWUS54 KSHV 212220 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 520 PM CDT TUE JUN 21 2011 TXC347-212228- /O.CAN.KSHV.TO.W.0079.000000T0000Z-110621T2230Z/ NACOGDOCHES TX- 520 PM CDT TUE JUN 21 2011 ...THE TORNADO WARNING FOR NACOGDOCHES COUNTY IS CANCELLED... LAT...LON 3176 9394 3154 9430 3177 9436 3184 9425 TIME...MOT...LOC 2218Z 295DEG 12KT 3174 9426 $$ TXC405-419-212230- /O.CON.KSHV.TO.W.0079.000000T0000Z-110621T2230Z/ SAN AUGUSTINE TX-SHELBY TX- 520 PM CDT TUE JUN 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR SHELBY AND SAN AUGUSTINE COUNTIES... AT 517 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO DETECT A TORNADO. THIS TORNADO WAS LOCATED NEAR JERICHO...OR 6 MILES SOUTHWEST OF CENTER...MOVING SOUTHEAST AT 15 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SHELBYVILLE AND NEUVILLE PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. && LAT...LON 3176 9394 3154 9430 3177 9436 3184 9425 TIME...MOT...LOC 2218Z 295DEG 12KT 3174 9426 $$ 09
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 4:30 AM CDT | Severe Thunderstorm Warning | SHV | Bowie, Cass, Franklin, Morris, Red River, Titus | 60 min |
| Jun 21, 8:26 AM CDT | Severe Thunderstorm Warning | SHV | Smith | 49 min |
| Jun 21, 9:15 AM CDT | Severe Thunderstorm Warning | SHV | Smith | 13 min |
| Jun 21, 2:33 PM CDT | Severe Thunderstorm Warning | SHV | Harrison, Panola | 42 min |
| Jun 21, 3:02 PM CDT | Severe Thunderstorm Warning | SHV | Panola, Shelby | 43 min |
| Jun 21, 3:39 PM CDT | Severe Thunderstorm Warning | SHV | Panola, Rusk, Shelby | 51 min |
| Jun 21, 3:50 PM CDT | Tornado Warning | SHV | Shelby | 40 min |
| Jun 21, 4:28 PM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Panola, Rusk, Shelby | 47 min |
| Jun 21, 5:16 PM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Rusk, Sabine, San Augustine, Shelby | 44 min |
| Jun 21, 5:59 PM CDT | Severe Thunderstorm Warning | SHV | Angelina, Nacogdoches, Sabine, San Augustine, Shelby | 46 min |
| Jun 21, 6:45 PM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Sabine, San Augustine, Shelby | 45 min |
Nearby
Tornado Warnings in Texas, 2011Every tornado warning in 2011Tornadoes 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.