Alert archive / Missouri / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 745
The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2011, 1:09 AM CDT for 4 counties in Kansas; 19 counties in Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2011, 1:09 AM CDT (06:09 UTC)
- Expired
- Aug 8, 2011, 4:37 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 23 counties
Bourbon County, KS, Crawford County, KS, Linn County, KS, Miami County, KS, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, Morgan County, MO, Polk County, MO, St. Clair County, MO, Vernon County, MO, Webster County, MO
The radar
The Pleasant Hill radar (KEAX), 95 km from the middle of the area, began a volume at 06:12 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 1:35 AM CDT | Severe Thunderstorm Warning | SGF | Miller, Morgan | 19 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
Springfield, MO (KSGF), launched 00:00Z, 6.2 hours before the alert went out and 125 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
- 1238 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 2423 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 7:13 PM CDT | Mesoscale Discussion | SPC | Barber, Clark, Comanche, Cowley, Edwards, Ford and 11 more | 3 hr |
| Aug 7, 7:49 PM CDT | Severe Thunderstorm Watch | SPC | Jewell, Mitchell, Osborne, Smith | 7 hr |
| Aug 7, 10:45 PM CDT | Mesoscale Discussion | SPC | Anderson, Clay, Cloud, Coffey, Dickinson, Douglas and 28 more | 2 hr |
| Aug 7, 11:08 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Brown, Chase, Clay, Cloud and 25 more | 5 hr |
| Aug 8, 12:46 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 7 more | 59 min |
| Aug 8, 4:52 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more | 6 hr |
| Aug 8, 6:27 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Clark, Comanche, Decatur, Edwards, Ellis and 31 more | 2 hr |
| Aug 8, 6:44 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Comanche, Edwards, Ellis, Finney, Ford and 18 more | 4 hr |
| Aug 7, 8:27 PM CDT | Mesoscale Discussion | SPC | Barry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 26 more | 2 hr |
| Aug 7, 9:18 PM CDT | Severe Thunderstorm Watch | SPC | Dunklin, Mississippi, New Madrid, Pemiscot | 4 hr |
| Aug 7, 10:54 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Carter, Dunklin, Howell, Mississippi and 8 more | 96 min |
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.