Alert archive / Missouri / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 34
The Storm Prediction Center issued this severe thunderstorm watch at Feb 26, 2009, 8:46 PM CST for 11 counties in Illinois; 14 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 26, 2009, 8:46 PM CST (02:46 UTC)
- Expired
- Feb 27, 2009, 2:17 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 25 counties
Alexander County, IL, Franklin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Perry County, IL, Pulaski County, IL, Randolph County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO
The radar
The Paducah radar (KPAH), 146 km from the middle of the area, began a volume at 02:47 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
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 26, 11:50 PM CST | Severe Thunderstorm Warning | PAH | Butler | 25 min |
| Feb 27, 1:09 AM CST | Severe Thunderstorm Warning | PAH | Mississippi | 36 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
Little Rock, AR (KLZK), launched 00:00Z, 2.8 hours before the alert went out and 269 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
- 170 J/kg
- Mixed-layer CIN
- -308 J/kg
- Mixed-layer LCL
- 917 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 290 m²/s²
- 0-3 km storm-relative helicity
- 332 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 26, 7:42 PM CST | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Christian, Clay, Clinton and 26 more | 93 min |
| Feb 26, 10:36 PM CST | Mesoscale Discussion | SPC | Alexander, Randolph | 114 min |
| Feb 26, 9:09 PM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 96 min |
| Feb 26, 9:40 PM CST | Severe Thunderstorm Watch | SPC | Dunklin, Pemiscot | 5 hr |
| Feb 27, 1:45 AM CST | Mesoscale Discussion | SPC | Dunklin | 30 min |
Nearby
Severe Thunderstorm Watches in Missouri, 2009Severe Thunderstorm Watches in Illinois, 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.