Alert archive / Missouri / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 694
The Storm Prediction Center issued this severe thunderstorm watch at Aug 10, 2009, 1:50 PM CDT for 5 counties in Kansas; 14 counties in Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2009, 1:50 PM CDT (18:50 UTC)
- Expired
- Aug 10, 2009, 5:18 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Bourbon County, KS, Crawford County, KS, Johnson County, KS, Linn County, KS, Miami County, KS, Barton County, MO, Bates County, MO, Benton County, MO, Cass County, MO, Cedar County, MO, Dade County, MO, Henry County, MO, Hickory County, MO, Jackson County, MO, Johnson County, MO, Pettis County, MO, Polk County, MO, St. Clair County, MO, Vernon County, MO
The radar
The Pleasant Hill radar (KEAX), 43 km from the middle of the area, began a volume at 18:53 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
- 5%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 2:02 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Linn, Miami | 43 min |
| Aug 10, 2:34 PM CDT | Severe Thunderstorm Warning | SGF | Bourbon | 56 min |
| Aug 10, 2:38 PM CDT | Severe Thunderstorm Warning | EAX | Linn, Miami | 52 min |
| Aug 10, 2:43 PM CDT | Severe Thunderstorm Warning | EAX | Johnson, Linn, Miami | 50 min |
| Aug 10, 2:54 PM CDT | Severe Thunderstorm Warning | SGF | Vernon | 66 min |
| Aug 10, 2:57 PM CDT | Severe Thunderstorm Warning | EAX | Cass, Jackson | 33 min |
| Aug 10, 3:18 PM CDT | Severe Thunderstorm Warning | SGF | St. Clair | 57 min |
| Aug 10, 3:19 PM CDT | Severe Thunderstorm Warning | EAX | Cass | 41 min |
| Aug 10, 3:24 PM CDT | Flash Flood Warning | SGF | Benton, Cedar, Dallas, Hickory, Polk, St. Clair and 1 more | 6 hr |
| Aug 10, 3:27 PM CDT | Severe Thunderstorm Warning | EAX | Bates, Cass, Henry | 33 min |
| Aug 10, 3:35 PM CDT | Severe Thunderstorm Warning | SGF | Cedar, St. Clair, Vernon | 55 min |
| Aug 10, 3:37 PM CDT | Severe Thunderstorm Warning | EAX | Cass, Jackson, Johnson | 38 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, 6.8 hours before the alert went out and 120 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
- 1686 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1057 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 2:29 AM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Logan, Norton, Rawlins and 4 more | 61 min |
| Aug 10, 2:49 AM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Greeley, Logan, Rawlins and 5 more | 6 hr |
| Aug 10, 6:02 AM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Greeley, Logan, Rawlins and 6 more | 118 min |
| Aug 10, 8:01 AM CDT | Mesoscale Discussion | SPC | Barton, Cloud, Decatur, Dickinson, Ellis, Ellsworth and 28 more | 89 min |
| Aug 10, 9:21 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Barton, Brown, Chase, Clay, Cloud and 30 more | 6 hr |
| Aug 10, 11:29 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Chase, Clay, Coffey, Dickinson and 27 more | 91 min |
| Aug 10, 2:58 PM CDT | Mesoscale Discussion | SPC | Barber, Butler, Chautauqua, Clark, Comanche, Cowley and 8 more | 92 min |
| Aug 10, 1:24 PM CDT | Mesoscale Discussion | SPC | Barry, Christian, Douglas, Greene, Howell, Lawrence and 6 more | 96 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2009Severe Thunderstorm Watches in Kansas, 2009Every severe thunderstorm watch in 2009
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.