Alert archive / Texas / Tornado Watches in 2009
Tornado Watch 211
The Storm Prediction Center issued this tornado watch at Apr 29, 2009, 2:33 PM CDT for 20 counties in Texas. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2009, 2:33 PM CDT (19:33 UTC)
- Expired
- Apr 29, 2009, 11:51 PM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
Counties Coke County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Glasscock County, TX, Irion County, TX, Kimble County, TX, Kinney County, TX, Maverick County, TX, Menard County, TX, Pecos County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Sterling County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX
The radar
The San Angelo radar (KSJT), 95 km from the middle of the area, began a volume at 19:36 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 2:43 PM CDT | Tornado Warning | MAF | Pecos | 32 min |
| Apr 29, 3:10 PM CDT | Severe Thunderstorm Warning | MAF | Pecos, Terrell | 35 min |
| Apr 29, 3:11 PM CDT | Tornado Warning | MAF | Pecos | 34 min |
| Apr 29, 3:37 PM CDT | Severe Thunderstorm Warning | MAF | Pecos, Terrell | 53 min |
| Apr 29, 3:44 PM CDT | Severe Thunderstorm Warning | MAF | Pecos | 31 min |
| Apr 29, 3:49 PM CDT | Tornado Warning | MAF | Pecos, Terrell | 41 min |
| Apr 29, 4:21 PM CDT | Tornado Warning | MAF | Pecos, Terrell | 54 min |
| Apr 29, 4:31 PM CDT | Severe Thunderstorm Warning | MAF | Pecos | 59 min |
| Apr 29, 4:52 PM CDT | Tornado Warning | MAF | Terrell | 53 min |
| Apr 29, 5:10 PM CDT | Severe Thunderstorm Warning | MAF | Pecos, Terrell | 65 min |
| Apr 29, 5:22 PM CDT | Tornado Warning | MAF | Terrell | 53 min |
| Apr 29, 5:35 PM CDT | Tornado Warning | SJT | Crockett | 55 min |
| Apr 29, 5:47 PM CDT | Tornado Warning | EWX | Val Verde | 43 min |
| Apr 29, 5:58 PM CDT | Tornado Warning | MAF | Terrell | 32 min |
| Apr 29, 6:22 PM CDT | Severe Thunderstorm Warning | MAF | Terrell | 53 min |
| Apr 29, 6:25 PM CDT | Tornado Warning | EWX | Val Verde | 65 min |
| Apr 29, 6:53 PM CDT | Tornado Warning | MAF | Terrell | 52 min |
| Apr 29, 7:21 PM CDT | Tornado Warning | EWX | Val Verde | 39 min |
| Apr 29, 7:26 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 49 min |
| Apr 29, 7:58 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 32 min |
| Apr 29, 8:34 PM CDT | Severe Thunderstorm Warning | EWX | Edwards, Val Verde | 26 min |
| Apr 29, 9:30 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 45 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Midland Regional, TX (KMAF), launched 12:00Z, 7.6 hours before the alert went out and 130 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
- 2530 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 526 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.7
The text
As transmitted, in the capitals the NWS used until 2016.
653
WWUS20 KWNS 291932
SEL1
SPC WW 291932
TXZ000-300300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 211
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT WED APR 29 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF SOUTHWEST TEXAS
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1000 PM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTH NORTHWEST OF
DRYDEN TEXAS TO 40 MILES NORTH OF JUNCTION TEXAS. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU1).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 209...WW 210...
DISCUSSION...SEVERE THUNDERSTORMS EXPECTED TO DEVELOP ON DRY LINE
WRN PORTION OF WW AND MOVE SLOWLY E. WITH MLCAPES TO 3000 J/KG AND
FAVORABLE VEERING SHEAR PROFILES...SUPERCELLS EXPECTED TO BE PRIMARY
MODE. VERY LARGE HAIL AND POSSIBLE TORNADOES WILL BE ASSOCIATED
WITH ANY SUPERCELL THAT DEVELOPS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25020.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 7:23 PM CDT | Mesoscale Discussion | SPC | Andrews, Armstrong, Bailey, Borden, Briscoe, Callahan and 61 more | 3 hr |
| Apr 28, 7:46 PM CDT | Mesoscale Discussion | SPC | Loving, Pecos, Reeves, Ward, Winkler | 119 min |
| Apr 28, 9:25 PM CDT | Severe Thunderstorm Watch | SPC | Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 43 more | 6 hr |
| Apr 28, 10:33 PM CDT | Mesoscale Discussion | SPC | Andrews, Armstrong, Bailey, Briscoe, Carson, Castro and 48 more | 87 min |
| Apr 28, 10:57 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Dawson, Ector, Gaines, Loving, Martin and 2 more | 5 hr |
| Apr 29, 2:46 AM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 27 more | 89 min |
| Apr 29, 3:49 AM CDT | Severe Thunderstorm Watch | SPC | Archer, Armstrong, Baylor, Briscoe, Carson, Childress and 19 more | 7 hr |
| Apr 29, 6:09 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Childress, Clay, Collingsworth, Cottle and 6 more | 96 min |
| Apr 29, 9:16 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Bowie, Camp, Cass, Clay and 26 more | 89 min |
| Apr 29, 9:36 AM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Collin, Cooke, Delta and 14 more | 6 hr |
| Apr 29, 12:07 PM CDT | Mesoscale Discussion | SPC | Borden, Bosque, Callahan, Coke, Coleman, Comanche and 33 more | 113 min |
| Apr 29, 12:36 PM CDT | Tornado Watch | SPC | Archer, Baylor, Borden, Callahan, Clay, Crosby and 32 more | 9 hr |
| Apr 29, 12:58 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Delta, Fannin and 8 more | 2 hr |
| Apr 29, 2:03 PM CDT | Mesoscale Discussion | SPC | Coke, Crockett, Glasscock, Irion, Midland, Reagan and 3 more | 57 min |
| Apr 29, 2:59 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Donley, Floyd, Gray and 7 more | 91 min |
| Apr 29, 3:04 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 17 more | 56 min |
| Apr 29, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 24 more | 6 hr |
| Apr 29, 3:34 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Callahan, Clay, Crosby and 31 more | 56 min |
| Apr 29, 3:47 PM CDT | Tornado Watch | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more | 7 hr |
| Apr 29, 5:17 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more | 88 min |
| Apr 29, 5:19 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Delta and 21 more | 116 min |
| Apr 29, 5:53 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 20 more | 67 min |
| Apr 29, 6:21 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Callahan, Clay, Crosby and 33 more | 54 min |
Nearby
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.