Alert archive / Texas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 182
The Storm Prediction Center issued this severe thunderstorm watch at Apr 22, 2011, 6:10 PM CDT for 27 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2011, 6:10 PM CDT (23:10 UTC)
- Expired
- Apr 23, 2011, 12:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 27 counties
Archer County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Grayson County, TX, Hood County, TX, Jack County, TX, Jones County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 93 km from the middle of the area, began a volume at 23:13 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
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 6:26 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Clay, Wichita | 64 min |
| Apr 22, 7:06 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 39 min |
| Apr 22, 7:30 PM CDT | Severe Thunderstorm Warning | OUN | Clay, Wichita | 45 min |
| Apr 22, 7:50 PM CDT | Severe Thunderstorm Warning | FWD | Montague | 55 min |
| Apr 22, 8:14 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 46 min |
| Apr 22, 8:44 PM CDT | Severe Thunderstorm Warning | FWD | Montague | 27 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
Fort Worth, TX (KFWD), launched 12:00Z, 11.2 hours before the alert went out and 118 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
- 1318 J/kg
- Mixed-layer CIN
- -465 J/kg
- Mixed-layer LCL
- 1244 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 297 m²/s²
- 0-3 km storm-relative helicity
- 510 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
243
WWUS20 KWNS 222308
SEL2
SPC WW 222308
TXZ000-230500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 182
NWS STORM PREDICTION CENTER NORMAN OK
610 PM CDT FRI APR 22 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF NORTHERN TEXAS
EFFECTIVE THIS FRIDAY NIGHT FROM 610 PM UNTIL MIDNIGHT CDT.
HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST
NORTHWEST OF SHERMAN TEXAS TO 40 MILES WEST OF BROWNWOOD TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 179...WW 180...WW 181...
DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY ALONG THE DRY
LINE WESTERN PORTION OF THE WATCH. WITH STRONG INSTABILITY AND
STEEP LAPSE RATES...SUPERCELLS ARE LIKELY. WITH HIGH LCLS AND
MARGINAL LOW LEVEL SHEAR...VERY LARGE HAIL AND DAMAGING DOWNBURSTS
WINDS ARE THE PRIMARY THREAT AS STORMS MOVE EWD ACROSS THE WATCH
THRU THE EVENING.
AVIATION...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 27025.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 11:27 PM CDT | Mesoscale Discussion | SPC | Craig, Grant, Kay, Nowata, Osage, Ottawa and 1 more | 3 hr |
| Apr 22, 10:44 AM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Coal, Haskell, Hughes, Latimer and 5 more | 61 min |
| Apr 22, 1:23 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 39 more | 97 min |
| Apr 22, 3:47 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 33 more | 8 hr |
| Apr 21, 9:15 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Callahan, Coke, Coleman, Concho and 26 more | 60 min |
| Apr 22, 5:43 PM CDT | Mesoscale Discussion | SPC | Archer, Callahan, Clay, Coleman, Comanche, Cooke and 17 more | 92 min |
Nearby
Severe Thunderstorm Watches in Texas, 2011Every severe thunderstorm watch 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.