Alert archive / Missouri / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 247
The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2005, 1:55 PM CDT for 17 counties in Illinois; 22 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2005, 1:55 PM CDT (18:55 UTC)
- Expired
- May 11, 2005, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 39 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 129 km from the middle of the area, began a volume at 18:58 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.
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 2:16 PM CDT | Tornado Warning | LSX | Boone | 44 min |
| May 11, 2:17 PM CDT | Severe Thunderstorm Warning | EAX | Howard, Randolph | 43 min |
| May 11, 2:20 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway | 40 min |
| May 11, 2:55 PM CDT | Tornado Warning | LSX | Audrain, Boone, Callaway | 50 min |
| May 11, 3:02 PM CDT | Severe Thunderstorm Warning | LSX | Callaway | 43 min |
| May 11, 3:12 PM CDT | Tornado Warning | LSX | Callaway | 48 min |
| May 11, 3:21 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Cole, Moniteau | 39 min |
| May 11, 3:55 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 53 min |
| May 11, 3:59 PM CDT | Severe Thunderstorm Warning | LSX | Callaway, Montgomery | 50 min |
| May 11, 4:44 PM CDT | Severe Thunderstorm Warning | LSX | Jefferson, Saint Louis, City of Saint Louis | 26 min |
| May 11, 5:02 PM CDT | Flash Flood Warning | EAX | Carroll, Chariton, Howard, Randolph, Saline | 6 hr |
| May 11, 5:03 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 31 min |
| May 11, 5:37 PM CDT | Flash Flood Warning | LSX | Boone | 5 hr |
| May 11, 5:37 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 38 min |
| May 11, 5:43 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 47 min |
| May 11, 5:48 PM CDT | Severe Thunderstorm Warning | LSX | Warren | 42 min |
| May 11, 5:56 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 49 min |
| May 11, 6:05 PM CDT | Severe Thunderstorm Warning | ILX | Morgan | 41 min |
| May 11, 6:10 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln | 51 min |
| May 11, 6:19 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 31 min |
| May 11, 6:34 PM CDT | Tornado Warning | LSX | Adams, Brown | 34 min |
| May 11, 7:15 PM CDT | Severe Thunderstorm Warning | ILX | Morgan, Scott | 39 min |
| May 11, 7:33 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Macoupin | 42 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
Lincoln, IL (KILX), launched 12:00Z, 6.9 hours before the alert went out and 246 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
- 1689 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 1125 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 3:11 AM CDT | Mesoscale Discussion | SPC | Bureau, Henry, Lee, Marshall, Mercer, Rock Island and 2 more | 2 hr |
| May 11, 8:41 AM CDT | Mesoscale Discussion | SPC | Adams, Hancock | 2 hr |
| May 11, 1:37 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Christian, Coles and 22 more | 113 min |
| May 11, 3:21 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Cumberland, DeWitt, Douglas and 4 more | 114 min |
| May 11, 6:28 PM CDT | Mesoscale Discussion | SPC | Christian, Clark, Clay, Coles, Crawford, Cumberland and 13 more | 2 hr |
| May 11, 11:45 AM CDT | Tornado Watch | SPC | Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 22 more | 7 hr |
| May 11, 3:41 PM CDT | Mesoscale Discussion | SPC | Andrew, Audrain, Boone, Buchanan, Caldwell, Carroll and 19 more | 94 min |
| May 11, 4:50 PM CDT | Severe Thunderstorm Watch | SPC | Bates, Benton, Camden, Cass, Cole, Cooper and 8 more | 6 hr |
| May 11, 5:25 PM CDT | Mesoscale Discussion | SPC | Andrew, Bates, Benton, Boone, Buchanan, Caldwell and 32 more | 2 hr |
| May 11, 6:45 PM CDT | Severe Thunderstorm Watch | SPC | Atchison | 7 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2005Severe Thunderstorm Watches in Illinois, 2005Every severe thunderstorm watch in 2005
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.