Alert archive / Missouri / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 7
The Storm Prediction Center issued this severe thunderstorm watch at Feb 9, 2009, 8:49 AM CST for 7 counties in Kansas; 25 counties in Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 9, 2009, 8:49 AM CST (14:49 UTC)
- Expired
- Feb 9, 2009, 11:05 AM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 32 counties
Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Andrew County, MO, Barton County, MO, Bates County, MO, Buchanan County, MO, Caldwell County, MO, Cass County, MO, Cedar County, MO, Clay County, MO, Clinton County, MO, Dade County, MO, Daviess County, MO, DeKalb County, MO, Greene County, MO, Henry County, MO, Holt County, MO, Jackson County, MO, Jasper County, MO, Johnson County, MO, Lafayette County, MO, Lawrence County, MO, Platte County, MO, Polk County, MO, Ray County, MO, St. Clair County, MO, Vernon County, MO
The radar
The Pleasant Hill radar (KEAX), 20 km from the middle of the area, began a volume at 14:50 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
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 9, 9:01 AM CST | Severe Thunderstorm Warning | SGF | Barry, Lawrence | 74 min |
| Feb 9, 9:03 AM CST | Severe Thunderstorm Warning | EAX | Atchison, Doniphan, Leavenworth, Wyandotte | 42 min |
| Feb 9, 9:10 AM CST | Severe Thunderstorm Warning | SGF | Cedar, Dade, St. Clair | 80 min |
| Feb 9, 9:17 AM CST | Severe Thunderstorm Warning | EAX | Johnson, Leavenworth, Miami, Wyandotte | 43 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, 2.8 hours before the alert went out and 101 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 931 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 355 m²/s²
- 0-3 km storm-relative helicity
- 379 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 9, 8:43 AM CST | Mesoscale Discussion | SPC | Atchison, Bourbon, Brown, Crawford, Doniphan, Douglas and 11 more | 32 min |
| Feb 9, 10:28 AM CST | Mesoscale Discussion | SPC | Andrew, Benton, Caldwell, Carroll, Christian, Clinton and 17 more | 62 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.