Alert archive / Illinois / Tornado Watches in 2010
Tornado Watch 97
The Storm Prediction Center issued this tornado watch at Apr 24, 2010, 3:20 PM CDT for 51 counties in Illinois; 13 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2010, 3:20 PM CDT (20:20 UTC)
- Expired
- Apr 24, 2010, 10:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 64 counties
Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Knox County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Washington County, IL, Woodford County, IL, City of Saint Louis, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO
The radar
The Lincoln radar (KILX), 98 km from the middle of the area, began a volume at 20:22 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
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 3:31 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Jefferson, Sainte Genevieve, Saint Francois, Saint Louis, Washington | 44 min |
| Apr 24, 3:59 PM CDT | Tornado Warning | LSX | Franklin, Jefferson, Saint Louis | 31 min |
| Apr 24, 4:20 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 25 min |
| Apr 24, 4:25 PM CDT | Tornado Warning | LSX | Madison, Saint Clair | 35 min |
| Apr 24, 4:34 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Randolph | 41 min |
| Apr 24, 4:43 PM CDT | Tornado Warning | LSX | Jersey, Madison | 32 min |
| Apr 24, 4:53 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Callaway, Franklin, Gasconade, Montgomery, Osage and 1 more | 52 min |
| Apr 24, 5:03 PM CDT | Tornado Warning | LSX | Bond, Jersey, Macoupin, Madison, Montgomery | 57 min |
| Apr 24, 5:09 PM CDT | Tornado Warning | LSX | Gasconade, Lincoln, Montgomery, Warren | 51 min |
| Apr 24, 5:14 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 36 min |
| Apr 24, 5:34 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Callaway, Montgomery, Pike, Ralls | 41 min |
| Apr 24, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Montgomery, Pike, Warren | 24 min |
| Apr 24, 5:54 PM CDT | Tornado Warning | ILX | Christian, Sangamon | 51 min |
| Apr 24, 5:57 PM CDT | Tornado Warning | LSX | Macoupin, Montgomery | 38 min |
| Apr 24, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Audrain, Monroe, Pike, Ralls | 47 min |
| Apr 24, 6:46 PM CDT | Tornado Warning | ILX | Christian, Sangamon | 34 min |
| Apr 24, 6:53 PM CDT | Severe Thunderstorm Warning | LSX | Fayette, Marion | 18 min |
| Apr 24, 7:00 PM CDT | Severe Thunderstorm Warning | ILX | Clay | 45 min |
| Apr 24, 7:18 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Fayette, Montgomery | 27 min |
| Apr 24, 7:36 PM CDT | Flash Flood Warning | LSX | Audrain, Boone, Callaway, Cole, Marion, Moniteau and 5 more | 6 hr |
| Apr 24, 7:40 PM CDT | Severe Thunderstorm Warning | ILX | Clay, Jasper, Richland | 35 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, 8.3 hours before the alert went out and 145 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
- 494 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 601 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 98 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 |
|---|---|---|---|---|
| Apr 23, 7:06 PM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 4 more | 5 hr |
| Apr 24, 7:35 AM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 12 more | 55 min |
| Apr 24, 11:08 AM CDT | Mesoscale Discussion | SPC | Monroe | 67 min |
| Apr 24, 11:31 AM CDT | Tornado Watch | SPC | Alexander, Franklin, Jackson, Johnson, Massac, Perry and 6 more | 8 hr |
| Apr 24, 1:17 PM CDT | Tornado Watch | SPC | Edwards, Gallatin, Hamilton, Hardin, Jefferson, Wabash and 2 more | 8 hr |
| Apr 24, 2:01 PM CDT | Mesoscale Discussion | SPC | Alexander, Hardin, Massac, Pope, Pulaski | 89 min |
| Apr 24, 2:52 PM CDT | Mesoscale Discussion | SPC | Bond, Clinton, Fayette, Jersey, Madison, Marion and 4 more | 53 min |
| Apr 24, 5:14 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 41 more | 61 min |
| Apr 24, 5:48 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 11 more | 57 min |
| Apr 23, 10:03 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Bates, Buchanan, Caldwell, Cass and 12 more | 27 min |
| Apr 23, 10:58 PM CDT | Tornado Watch | SPC | Andrew, Atchison, Buchanan, Caldwell, Carroll, Clay and 15 more | 5 hr |
| Apr 23, 11:40 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 65 min |
| Apr 24, 2:44 AM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 91 min |
| Apr 24, 3:15 AM CDT | Mesoscale Discussion | SPC | Caldwell, Carroll, Daviess, Grundy, Livingston, Mercer and 1 more | 30 min |
| Apr 24, 6:00 AM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 6 hr |
| Apr 24, 9:31 AM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 59 min |
| Apr 24, 1:29 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Gentry, Harrison, Holt, Mercer and 2 more | 91 min |
| Apr 24, 1:52 PM CDT | Mesoscale Discussion | SPC | Camden, Christian, Crawford, Dallas, Dent, Douglas and 14 more | 53 min |
Nearby
Tornado Watches in Illinois, 2010Tornado Watches in Missouri, 2010Every tornado watch in 2010
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.