Alert archive / Illinois / Tornado Watches in 2010
Tornado Watch 369
The Storm Prediction Center issued this tornado watch at Jun 21, 2010, 4:36 PM CDT for 48 counties in Illinois; 24 counties in Iowa; 16 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2010, 4:36 PM CDT (21:36 UTC)
- Expired
- Jun 21, 2010, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 88 counties
Appanoose County, IA, Cedar County, IA, Clarke County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, Champaign County, IL, DeKalb County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Adair County, MO, Chariton County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Putnam County, MO, Ralls County, MO, Randolph County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO
The radar
The Quad Cities radar (KDVN), 113 km from the middle of the area, began a volume at 21:36 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
- 60%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 50%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
49 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 4:36 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson | 54 min |
| Jun 21, 5:00 PM CDT | Tornado Warning | LOT | Ford, Iroquois | 30 min |
| Jun 21, 5:01 PM CDT | Tornado Warning | DVN | Hancock, Henderson | 44 min |
| Jun 21, 5:23 PM CDT | Flash Flood Warning | DVN | Hancock, Henderson | 4 hr |
| Jun 21, 5:29 PM CDT | Tornado Warning | LOT | Iroquois | 61 min |
| Jun 21, 5:36 PM CDT | Tornado Warning | DVN | Hancock, Henderson | 39 min |
| Jun 21, 6:13 PM CDT | Tornado Warning | DVN | Hancock, McDonough | 47 min |
| Jun 21, 6:22 PM CDT | Tornado Warning | ILX | Vermilion | 38 min |
| Jun 21, 6:27 PM CDT | Tornado Warning | LOT | Iroquois | 33 min |
| Jun 21, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Wayne | 47 min |
| Jun 21, 6:44 PM CDT | Tornado Warning | DVN | Hancock, McDonough | 46 min |
| Jun 21, 6:50 PM CDT | Tornado Warning | LOT | Ford, Livingston | 55 min |
| Jun 21, 6:53 PM CDT | Tornado Warning | DMX | Davis | 22 min |
| Jun 21, 6:57 PM CDT | Tornado Warning | ILX | Vermilion | 63 min |
| Jun 21, 6:58 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 62 min |
| Jun 21, 6:59 PM CDT | Tornado Warning | DVN | McDonough | 46 min |
| Jun 21, 7:05 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee, Van Buren | 55 min |
| Jun 21, 7:17 PM CDT | Tornado Warning | ILX | Fulton, Schuyler | 58 min |
| Jun 21, 7:18 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 57 min |
| Jun 21, 7:20 PM CDT | Severe Thunderstorm Warning | DVN | McDonough | 45 min |
| Jun 21, 7:22 PM CDT | Flash Flood Warning | ILX | Vermilion | 6 hr |
| Jun 21, 7:25 PM CDT | Severe Thunderstorm Warning | DMX | Davis | 32 min |
| Jun 21, 7:26 PM CDT | Tornado Warning | DVN | Clinton, Jackson | 35 min |
| Jun 21, 7:28 PM CDT | Severe Thunderstorm Warning | EAX | Putnam, Schuyler | 32 min |
| Jun 21, 7:38 PM CDT | Severe Thunderstorm Warning | EAX | Mercer, Putnam, Sullivan | 26 min |
| Jun 21, 7:41 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 31 min |
| Jun 21, 7:47 PM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 6 hr |
| Jun 21, 7:56 PM CDT | Severe Thunderstorm Warning | EAX | Putnam, Schuyler | 34 min |
| Jun 21, 7:58 PM CDT | Flash Flood Warning | DVN | Hancock, Henderson, McDonough, Warren | 6 hr |
| Jun 21, 7:59 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 31 min |
| Jun 21, 8:02 PM CDT | Severe Thunderstorm Warning | DVN | Scotland | 58 min |
| Jun 21, 8:12 PM CDT | Flash Flood Warning | DVN | Van Buren | 6 hr |
| Jun 21, 8:17 PM CDT | Tornado Warning | ILX | Vermilion | 21 min |
| Jun 21, 8:23 PM CDT | Severe Thunderstorm Warning | EAX | Schuyler | 22 min |
| Jun 21, 8:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 56 min |
| Jun 21, 8:48 PM CDT | Flash Flood Warning | DVN | Hancock, Henderson | 5 hr |
| Jun 21, 8:51 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Kankakee, LaSalle, Livingston, Will | 54 min |
| Jun 21, 8:57 PM CDT | Tornado Warning | LSX | Knox | 48 min |
| Jun 21, 9:15 PM CDT | Tornado Warning | LSX | Knox, Lewis | 45 min |
| Jun 21, 9:17 PM CDT | Tornado Warning | LOT | Ford, Iroquois, Livingston | 43 min |
| Jun 21, 9:29 PM CDT | Severe Thunderstorm Warning | DMX | Davis | 31 min |
| Jun 21, 9:33 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson | 44 min |
| Jun 21, 9:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 56 min |
| Jun 21, 9:35 PM CDT | Flash Flood Warning | ILX | Fulton, Schuyler | 6 hr |
| Jun 21, 9:40 PM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 53 min |
| Jun 21, 9:43 PM CDT | Flash Flood Warning | ILX | Edgar, Vermilion | 6 hr |
| Jun 21, 9:50 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Grundy, Kendall, Will | 32 min |
| Jun 21, 9:52 PM CDT | Tornado Warning | LSX | Lewis | 38 min |
| Jun 21, 9:54 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 66 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
Davenport, (KDVN), launched 12:00Z, 9.6 hours before the alert went out and 118 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
- 1443 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 800 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 7:39 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Greene, Hancock and 6 more | 96 min |
| Jun 21, 12:28 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 14 more | 62 min |
| Jun 21, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Christian, DeWitt and 21 more | 4 hr |
| Jun 21, 4:10 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 27 more | 35 min |
| Jun 21, 5:35 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 13 more | 55 min |
| Jun 20, 8:07 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Carroll, Cass, Crawford and 13 more | 6 hr |
| Jun 20, 9:35 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Carroll, Cherokee, Clay, Crawford, Ida and 8 more | 55 min |
| Jun 20, 9:57 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 7 hr |
| Jun 20, 11:00 PM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Decatur, Fremont, Mills and 7 more | 90 min |
| Jun 21, 3:17 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Cass, Decatur, Fremont, Mills and 6 more | 58 min |
| Jun 21, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie | 5 hr |
| Jun 21, 4:43 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 32 min |
| Jun 21, 5:30 PM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Decatur, Fremont, Lucas and 7 more | 90 min |
| Jun 21, 5:56 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Fremont, Page, Ringgold, Taylor, Union | 7 hr |
| Jun 21, 1:48 PM CDT | Mesoscale Discussion | SPC | Platte | 87 min |
Nearby
Tornado Watches in Illinois, 2010Tornado Watches in Iowa, 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.