Alert archive / Texas / Tornado Warnings in 2011
Tornado Warning 4, NWS Midland/Odessa, TX
NWS Midland/Odessa, TX issued this tornado warning at Apr 21, 2011, 6:45 PM CDT for Terrell County, Texas. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2011, 6:45 PM CDT (23:45 UTC)
- Expired
- Apr 21, 2011, 7:45 PM CDT
- In force
- 60 min
- Issued by
- NWS Midland/Odessa, TX
- Area
- Storm-based polygon
County Terrell County, TX
The radar
The Laughlin AFB radar (KDFX), 198 km from the middle of the area, began a volume at 23:46 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.
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 21, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 11.8 hours before the alert went out and 146 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
- 2808 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.7
The text
As transmitted, in the capitals the NWS used until 2016.
728 WFUS54 KMAF 212345 TORMAF TXC443-220045- /O.NEW.KMAF.TO.W.0004.110421T2345Z-110422T0045Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX 645 PM CDT THU APR 21 2011 THE NATIONAL WEATHER SERVICE IN MIDLAND HAS ISSUED A * TORNADO WARNING FOR... CENTRAL TERRELL COUNTY IN SOUTHWEST TEXAS... * UNTIL 745 PM CDT * AT 639 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES EAST OF SANDERSON...MOVING SOUTHEAST AT 25 MPH. * THE TORNADO WILL AFFECT THE FOLLOWING LOCATIONS... RURAL LOCATIONS NORTH OF U.S. HIGHWAY 90 BETWEEN SANDERSON AND DRYDEN... DRYDEN... PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO MAY FORM AT ANY TIME...DRYDEN IS IN THE PATH OF THIS STORM. RESIDENTS IN DRYDEN SHOULD TAKE COVER NOW! ABANDON MOBILE HOMES AND VEHICLES FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS. IN ADDITION TO THE TORNADO... THIS STORM IS CAPABLE OF PRODUCING LARGE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. SEEK SAFE SHELTER NOW. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. IF YOU WAIT TO SEE OR HEAR IT COMING... IT MAY BE TOO LATE TO GET TO A SAFE PLACE. TAKE COVER NOW. && LAT...LON 3028 10176 2980 10199 3011 10243 3036 10230 TIME...MOT...LOC 2344Z 295DEG 21KT 3015 10225 $$
2 follow-up statements
992 WWUS54 KMAF 220001 SVSMAF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX 701 PM CDT THU APR 21 2011 TXC443-220045- /O.CON.KMAF.TO.W.0004.000000T0000Z-110422T0045Z/ TERRELL TX- 701 PM CDT THU APR 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR CENTRAL TERRELL COUNTY... ...RESIDENTS IN THE COMMUNITY OF DRYDEN SHOULD SEEK IMMEDIATE SHELTER... AT 656 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE MOST DANGEROUS PART OF THIS STORM WAS LOCATED 6 MILES NORTHWEST OF DRYDEN...MOVING SOUTHEAST AT 25 MPH. THE COMMUNITY OF DRYDEN IS IN THE PATH OF THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO MAY FORM AT ANY TIME...ABANDON MOBILE HOMES AND VEHICLES FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. IF YOU WAIT TO SEE OR HEAR IT COMING... IT MAY BE TOO LATE TO GET TO A SAFE PLACE. RESIDENTS IN CENTRAL TERRELL COUNTY...INCLUDING THE COMMUNITY OF DRYDEN SHOULD TAKE COVER NOW! && LAT...LON 3028 10176 2980 10199 3011 10243 3036 10230 TIME...MOT...LOC 2359Z 302DEG 20KT 3010 10218 $$
517 WWUS54 KMAF 220020 SVSMAF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX 720 PM CDT THU APR 21 2011 TXC443-220045- /O.CON.KMAF.TO.W.0004.000000T0000Z-110422T0045Z/ TERRELL TX- 720 PM CDT THU APR 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR SOUTHERN TERRELL COUNTY... ...RESIDENTS IN THE COMMUNITY OF DRYDEN SHOULD SEEK IMMEDIATE SHELTER... AT 710 PM CDT...THE TERRELL COUNTY ASOS REPORTED A WIND GUST OF 58 MPH. AT 713 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THE MOST DANGEROUS PART OF THIS STORM WAS LOCATED NEAR DRYDEN...MOVING SOUTHEAST AT 20 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO MAY FORM AT ANY TIME...ABANDON MOBILE HOMES AND VEHICLES FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS. HEAVY RAINFALL MAY OBSCURE THIS TORNADO. IF YOU WAIT TO SEE OR HEAR IT COMING... IT MAY BE TOO LATE TO GET TO A SAFE PLACE. RESIDENTS IN CENTRAL TERRELL COUNTY...INCLUDING THE COMMUNITY OF DRYDEN SHOULD TAKE COVER NOW! IN ADDITION TO THE TORNADO...BASEBALL SIZE HAIL AND DAMAGING STRAIGHT LINE WINDS ARE LIKELY WITH THIS STORM. && LAT...LON 3028 10176 2980 10199 3007 10237 3032 10221 TIME...MOT...LOC 0016Z 306DEG 18KT 3004 10210 $$
The office that day
Everything else NWS Midland/Odessa, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 8:21 PM CDT | Severe Thunderstorm Warning | MAF | Pecos | 34 min |
| Apr 20, 9:08 PM CDT | Severe Thunderstorm Warning | MAF | Pecos | 37 min |
| Apr 21, 4:41 AM CDT | Red Flag Warning | MAF | 40 hr | |
| Apr 21, 5:12 AM CDT | High Wind Watch | MAF | 10 hr | |
| Apr 21, 3:29 PM CDT | Severe Thunderstorm Warning | MAF | Pecos | 61 min |
| Apr 21, 4:18 PM CDT | Tornado Warning | MAF | Pecos, Terrell | 57 min |
| Apr 21, 5:14 PM CDT | Tornado Warning | MAF | Pecos | 61 min |
| Apr 21, 5:47 PM CDT | Tornado Warning | MAF | Pecos, Terrell | 58 min |
| Apr 21, 6:01 PM CDT | Severe Thunderstorm Warning | MAF | Scurry | 14 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.