Alert archive / Texas / Tornado Watches in 2010
Tornado Watch 73
The Storm Prediction Center issued this tornado watch at Apr 21, 2010, 4:09 PM CDT for 34 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2010, 4:09 PM CDT (21:09 UTC)
- Expired
- Apr 21, 2010, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 34 counties
Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hockley County, TX, Kent County, TX, King County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Stonewall County, TX, Swisher County, TX, Terry County, TX, Wheeler County, TX, Yoakum County, TX
The radar
The Amarillo radar (KAMA), 62 km from the middle of the area, began a volume at 21:09 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
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 5:15 PM CDT | Severe Thunderstorm Warning | LUB | Hale | 45 min |
| Apr 21, 5:57 PM CDT | Severe Thunderstorm Warning | AMA | Oldham | 63 min |
| Apr 21, 5:59 PM CDT | Severe Thunderstorm Warning | LUB | Floyd, Hale | 46 min |
| Apr 21, 6:07 PM CDT | Severe Thunderstorm Warning | LUB | Floyd, Motley | 23 min |
| Apr 21, 6:20 PM CDT | Tornado Warning | AMA | Oldham | 25 min |
| Apr 21, 6:30 PM CDT | Severe Thunderstorm Warning | LUB | Floyd, Motley | 45 min |
| Apr 21, 6:50 PM CDT | Severe Thunderstorm Warning | LUB | Dickens, Kent | 40 min |
| Apr 21, 6:55 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Oldham | 65 min |
| Apr 21, 7:14 PM CDT | Severe Thunderstorm Warning | LUB | Briscoe, Floyd, Hall, Motley | 46 min |
| Apr 21, 7:19 PM CDT | Severe Thunderstorm Warning | LUB | Kent | 56 min |
| Apr 21, 7:40 PM CDT | Severe Thunderstorm Warning | LUB | Cottle, Dickens, King, Motley | 50 min |
| Apr 21, 7:55 PM CDT | Severe Thunderstorm Warning | AMA | Hartley, Oldham | 28 min |
| Apr 21, 8:11 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle, Hall, Motley | 49 min |
| Apr 21, 8:14 PM CDT | Severe Thunderstorm Warning | LUB | Kent | 26 min |
| Apr 21, 8:27 PM CDT | Severe Thunderstorm Warning | LUB | Dickens, King | 36 min |
| Apr 21, 8:31 PM CDT | Severe Thunderstorm Warning | LUB | Hall, Motley | 29 min |
| Apr 21, 8:49 PM CDT | Severe Thunderstorm Warning | LUB | Cochran, Terry, Yoakum | 41 min |
| Apr 21, 9:01 PM CDT | Severe Thunderstorm Warning | LUB | Childress | 29 min |
| Apr 21, 9:30 PM CDT | Severe Thunderstorm Warning | LUB | Cochran, Hockley | 45 min |
| Apr 21, 9:30 PM CDT | Severe Thunderstorm Warning | LUB | Childress | 30 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 9.2 hours before the alert went out and 62 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
- 12 J/kg
- Mixed-layer CIN
- -224 J/kg
- Mixed-layer LCL
- 1374 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:22 PM CDT | Mesoscale Discussion | SPC | Armstrong, Briscoe, Castro, Childress, Cottle, Dallam and 12 more | 83 min |
| Apr 21, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Dallam, Hartley | 6 hr |
| Apr 21, 6:29 PM CDT | Mesoscale Discussion | SPC | Dallam, Hartley | 91 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.