Alert archive / Kansas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 668
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2011, 6:47 PM MDT for Cheyenne County, Kit Carson County, Yuma County, Colorado; 25 counties in Kansas; 8 counties in Nebraska. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2011, 6:47 PM MDT (00:47 UTC)
- Expired
- Jul 21, 2011, 11:10 PM MDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 36 counties
Cheyenne County, CO, Kit Carson County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Ellis County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Jewell County, KS, Lane County, KS, Logan County, KS, Mitchell County, KS, Ness County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Rush County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Trego County, KS, Wallace County, KS, Wichita County, KS, Dundy County, NE, Franklin County, NE, Furnas County, NE, Harlan County, NE, Hitchcock County, NE, Nuckolls County, NE, Red Willow County, NE, Webster County, NE
The radar
The Goodland radar (KGLD), 61 km from the middle of the area, began a volume at 00:48 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
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Jul 21, 7:34 PM MDT | Severe Thunderstorm Warning | GLD | Cheyenne, Kit Carson | 56 min |
| Jul 21, 8:26 PM MDT | Severe Thunderstorm Warning | GID | Jewell, Smith | 49 min |
| Jul 21, 8:39 PM MDT | Severe Thunderstorm Warning | GID | Jewell | 51 min |
| Jul 21, 9:07 PM MDT | Severe Thunderstorm Warning | GID | Jewell | 38 min |
| Jul 21, 9:24 PM MDT | Severe Thunderstorm Warning | GID | Nuckolls, Thayer | 27 min |
| Jul 21, 9:45 PM MDT | Flash Flood Warning | GLD | Thomas | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 0.8 hours before the alert went out and 199 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
- 3380 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 105 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 |
|---|---|---|---|---|
| Jul 21, 6:10 PM MDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Greeley, Logan, Norton and 7 more | 95 min |
| Jul 21, 9:16 PM MDT | Mesoscale Discussion | SPC | Atchison, Brown, Clay, Cloud, Decatur, Dickinson and 37 more | 89 min |
| Jul 21, 9:44 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Butler, Cass, Clay, Douglas, Fillmore and 19 more | 89 min |
| Jul 22, 5:22 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boyd, Brown, Chase, Cherry and 17 more | 53 min |
Nearby
Severe Thunderstorm Watches in Kansas, 2011Severe Thunderstorm Watches in Nebraska, 2011Severe Thunderstorm Watches in Colorado, 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.