Alert archive / Missouri / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 735
The Storm Prediction Center issued this severe thunderstorm watch at Aug 7, 2011, 12:55 PM CDT for 12 counties in Kansas; 17 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 7, 2011, 12:55 PM CDT (17:55 UTC)
- Expired
- Aug 7, 2011, 5:49 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 29 counties
Atchison County, KS, Douglas County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Pottawatomie County, KS, Shawnee County, KS, Wabaunsee County, KS, Wyandotte County, KS, Bates County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Pettis County, MO, Platte County, MO, Ray County, MO, Saline County, MO
The radar
The Pleasant Hill radar (KEAX), 100 km from the middle of the area, began a volume at 17:55 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
- 50%
- 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
- 80%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 12:56 PM CDT | Severe Thunderstorm Warning | EAX | Atchison | 34 min |
| Aug 7, 1:02 PM CDT | Severe Thunderstorm Warning | TOP | Jackson, Pottawatomie | 28 min |
| Aug 7, 1:23 PM CDT | Severe Thunderstorm Warning | TOP | Jackson, Pottawatomie, Shawnee, Wabaunsee | 37 min |
| Aug 7, 2:08 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Leavenworth, Wyandotte | 22 min |
| Aug 7, 2:29 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Leavenworth, Wyandotte | 31 min |
| Aug 7, 2:48 PM CDT | Severe Thunderstorm Warning | EAX | Wyandotte | 27 min |
| Aug 7, 2:48 PM CDT | Severe Thunderstorm Warning | TOP | Douglas, Franklin | 27 min |
| Aug 7, 2:55 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Miami | 22 min |
| Aug 7, 3:14 PM CDT | Severe Thunderstorm Warning | EAX | Jackson, Johnson, Lafayette, Ray | 31 min |
| Aug 7, 3:42 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Lafayette, Pettis, Saline | 33 min |
| Aug 7, 4:13 PM CDT | Severe Thunderstorm Warning | EAX | Cooper, Howard, Pettis, Saline | 32 min |
| Aug 7, 4:42 PM CDT | Severe Thunderstorm Warning | EAX | Cooper, Howard | 33 min |
| Aug 7, 4:45 PM CDT | Severe Thunderstorm Warning | EAX | Henry | 30 min |
| Aug 7, 5:14 PM CDT | Severe Thunderstorm Warning | EAX | Henry | 16 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, 5.9 hours before the alert went out and 61 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
- 185 J/kg
- Mixed-layer CIN
- -540 J/kg
- Mixed-layer LCL
- 1321 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 264 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 10:48 AM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Barton, Chase, Clay, Cloud and 33 more | 117 min |
| Aug 7, 2:21 PM CDT | Mesoscale Discussion | SPC | Clark, Comanche, Haskell, Meade, Seward, Stevens | 114 min |
| Aug 7, 3:16 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Coffey, Crawford, Douglas and 7 more | 119 min |
| Aug 7, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | Bourbon, Crawford | 6 hr |
| Aug 7, 5:20 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 3 more | 115 min |
| Aug 7, 6:07 PM CDT | Severe Thunderstorm Watch | SPC | Chautauqua, Cherokee, Elk, Labette, Montgomery, Neosho and 1 more | 5 hr |
| Aug 6, 8:10 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 8 more | 2 hr |
| Aug 6, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Chariton, Clark, Grundy, Knox, Lewis and 14 more | 5 hr |
| Aug 6, 11:06 PM CDT | Mesoscale Discussion | SPC | Adair, Clark, Gentry, Grundy, Harrison, Knox and 11 more | 114 min |
| Aug 7, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Franklin, Iron and 17 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2011Severe 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.