Alert archive / Texas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 311
The Storm Prediction Center issued this severe thunderstorm watch at May 19, 2011, 11:39 PM CDT for Harmon County, Jackson County, Tillman County, Oklahoma; 25 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 19, 2011, 11:39 PM CDT (04:39 UTC)
- Expired
- May 20, 2011, 6:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 28 counties
Harmon County, OK, Jackson County, OK, Tillman County, OK, Baylor County, TX, Borden County, TX, Childress County, TX, Coke County, TX, Cottle County, TX, Dickens County, TX, Fisher County, TX, Foard County, TX, Garza County, TX, Glasscock County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Martin County, TX, Mitchell County, TX, Nolan County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Wilbarger County, TX
The radar
The Lubbock radar (KLBB), 133 km from the middle of the area, began a volume at 04:39 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 11:43 PM CDT | Severe Thunderstorm Warning | MAF | Borden, Dawson, Howard, Martin | 62 min |
| May 19, 11:46 PM CDT | Severe Thunderstorm Warning | LUB | Cottle, Dickens, King, Motley | 44 min |
| May 19, 11:49 PM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle, Hall, Motley | 41 min |
| May 20, 12:16 AM CDT | Severe Thunderstorm Warning | MAF | Martin | 29 min |
| May 20, 12:31 AM CDT | Severe Thunderstorm Warning | LUB | Childress, Cottle | 44 min |
| May 20, 12:32 AM CDT | Severe Thunderstorm Warning | LUB | Cottle, Dickens, King, Motley | 43 min |
| May 20, 12:37 AM CDT | Severe Thunderstorm Warning | MAF | Borden, Howard | 53 min |
| May 20, 12:44 AM CDT | Severe Thunderstorm Warning | LUB | Dickens, Garza, Kent, King | 61 min |
| May 20, 1:28 AM CDT | Severe Thunderstorm Warning | MAF | Martin, Midland | 32 min |
| May 20, 1:37 AM CDT | Severe Thunderstorm Warning | LUB | Cottle, Dickens, Kent, King, Stonewall | 37 min |
| May 20, 1:38 AM CDT | Severe Thunderstorm Warning | MAF | Borden, Howard, Mitchell, Scurry | 52 min |
| May 20, 2:12 AM CDT | Severe Thunderstorm Warning | MAF | Mitchell, Scurry | 63 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 00:00Z, 4.7 hours before the alert went out and 229 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
- 4539 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 85 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 |
|---|---|---|---|---|
| May 19, 7:47 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Comanche, Cotton, Grady, Kiowa and 1 more | 118 min |
| May 20, 2:58 AM CDT | Mesoscale Discussion | SPC | Comanche, Jackson, Kiowa, Tillman, Washita | 92 min |
| May 20, 9:11 AM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Ottawa | 2 hr |
| May 20, 10:30 AM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more | 60 min |
| May 20, 11:03 AM CDT | Tornado Watch | SPC | Adair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more | 7 hr |
| May 20, 1:28 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 3 more | 62 min |
| May 20, 1:52 PM CDT | Mesoscale Discussion | SPC | Ellis, Harper, Woods, Woodward | 113 min |
| May 20, 2:32 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more | 7 hr |
| May 20, 4:00 PM CDT | Mesoscale Discussion | SPC | Choctaw, LeFlore, McCurtain, Pushmataha | 60 min |
| May 20, 5:56 PM CDT | Tornado Watch | SPC | McCurtain | 3 hr |
| May 20, 6:01 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more | 59 min |
| May 19, 9:36 PM CDT | Mesoscale Discussion | SPC | Borden, Briscoe, Childress, Coke, Collingsworth, Cottle and 28 more | 84 min |
| May 20, 12:08 PM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Blanco, Bosque and 56 more | 67 min |
| May 20, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 60 more | 10 hr |
| May 20, 5:34 PM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 41 more | 116 min |
Nearby
Severe Thunderstorm Watches in Texas, 2011Severe Thunderstorm Watches in Oklahoma, 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.