Alert archive / Kansas / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 682
The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2011, 6:53 PM CDT for 26 counties in Kansas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2011, 6:53 PM CDT (23:53 UTC)
- Expired
- Jul 24, 2011, 9:36 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 70 kt
All 26 counties
Clay County, KS, Cloud County, KS, Dickinson County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Lyon County, KS, Marshall County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Rooks County, KS, Shawnee County, KS, Smith County, KS, Wabaunsee County, KS, Washington County, KS
The radar
The Grand Island radar (KUEX), 117 km from the middle of the area, began a volume at 23:53 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
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 24, 7:02 PM CDT | Severe Thunderstorm Warning | TOP | Coffey, Lyon, Osage | 58 min |
| Jul 24, 7:12 PM CDT | Severe Thunderstorm Warning | TOP | Clay, Marshall, Pottawatomie, Riley, Wabaunsee, Washington | 48 min |
| Jul 24, 7:35 PM CDT | Severe Thunderstorm Warning | GID | Osborne, Rooks | 40 min |
| Jul 24, 7:44 PM CDT | Severe Thunderstorm Warning | TOP | Marshall, Washington | 46 min |
| Jul 24, 7:59 PM CDT | Severe Thunderstorm Warning | TOP | Marshall, Nemaha, Pottawatomie | 46 min |
| Jul 24, 8:27 PM CDT | Severe Thunderstorm Warning | TOP | Marshall, Nemaha | 48 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
Topeka, KS (KTOP), launched 12:00Z, 11.9 hours before the alert went out and 190 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
- 1035 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1265 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 1:40 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Butler, Chase, Chautauqua, Clark and 24 more | 95 min |
| Jul 24, 6:35 PM CDT | Mesoscale Discussion | SPC | Atchison, Clay, Cloud, Douglas, Franklin, Geary and 12 more | 55 min |
Nearby
Severe Thunderstorm Watches in Kansas, 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.