Alert archive / Kansas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 418
The Storm Prediction Center issued this severe thunderstorm watch at Jun 1, 2011, 11:49 PM CDT for 21 counties in Kansas; 8 counties in Nebraska. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2011, 11:49 PM CDT (04:49 UTC)
- Expired
- Jun 2, 2011, 3:56 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 29 counties
Chase County, KS, Cloud County, KS, Dickinson County, KS, Ellsworth County, KS, Geary County, KS, Jewell County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, McPherson County, KS, Mitchell County, KS, Morris County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Rice County, KS, Rooks County, KS, Russell County, KS, Saline County, KS, Smith County, KS, Wabaunsee County, KS, Adams County, NE, Clay County, NE, Franklin County, NE, Harlan County, NE, Kearney County, NE, Nuckolls County, NE, Phelps County, NE, Webster County, NE
The radar
The Grand Island radar (KUEX), 81 km from the middle of the area, began a volume at 04:51 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
- 30%
- 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 11:51 PM CDT | Severe Thunderstorm Warning | TOP | Dickinson | 54 min |
| Jun 1, 11:56 PM CDT | Severe Thunderstorm Warning | TOP | Geary, Riley | 49 min |
| Jun 2, 12:22 AM CDT | Severe Thunderstorm Warning | GID | Franklin, Webster | 27 min |
| Jun 2, 12:42 AM CDT | Severe Thunderstorm Warning | TOP | Geary, Pottawatomie, Riley, Wabaunsee | 48 min |
| Jun 2, 12:45 AM CDT | Tornado Warning | GID | Jewell, Mitchell | 30 min |
| Jun 2, 1:19 AM CDT | Flash Flood Warning | TOP | Cloud, Ottawa | 6 hr |
| Jun 2, 1:32 AM CDT | Severe Thunderstorm Warning | GID | Jewell, Mitchell | 28 min |
| Jun 2, 1:38 AM CDT | Severe Thunderstorm Warning | TOP | Cloud | 22 min |
| Jun 2, 2:30 AM CDT | Flash Flood Warning | ICT | Ellsworth | 7 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
Topeka, KS (KTOP), launched 00:00Z, 4.8 hours before the alert went out and 226 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
- 1634 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 780 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 10.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 7:19 PM CDT | Mesoscale Discussion | SPC | Barton, Chase, Clay, Cloud, Dickinson, Ellis and 21 more | 56 min |
| Jun 1, 7:37 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Finney, Ford, Grant, Gray, Hamilton and 8 more | 3 hr |
| Jun 1, 11:25 PM CDT | Mesoscale Discussion | SPC | Barton, Chase, Clay, Cloud, Dickinson, Ellis and 27 more | 35 min |
| Jun 2, 2:12 AM CDT | Mesoscale Discussion | SPC | Clay, Cloud, Dickinson, Geary, Jackson, Jewell and 11 more | 2 hr |
| Jun 2, 6:03 PM CDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Sheridan | 87 min |
Nearby
Severe Thunderstorm Watches in Kansas, 2011Severe Thunderstorm Watches in Nebraska, 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.