Alert archive / Illinois / Tornado Watches in 2010

Tornado Watch 396

June 23, 201039 counties in Illinois; 25 counties in Iowa; Clark County, Scotland County, Missouri

The Storm Prediction Center issued this tornado watch at Jun 23, 2010, 2:10 PM CDT for 39 counties in Illinois; 25 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jun 23, 2010, 2:10 PM CDT (19:10 UTC)
Expired: Jun 23, 2010, 9:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 80 kt

All 66 counties

Appanoose County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Decatur County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Monroe County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 19:11 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: 20%
Ten or more severe wind reports: 90%
One or more gusts of 65 knots or more: 70%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

47 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 23, 3:25 PM CDT	Severe Thunderstorm Warning	DVN	Mercer, Rock Island	65 min
Jun 23, 3:34 PM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	56 min
Jun 23, 3:48 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Jefferson, Keokuk, Louisa, Washington	57 min
Jun 23, 3:52 PM CDT	Flash Flood Warning	DVN	Rock Island	6 hr
Jun 23, 3:56 PM CDT	Tornado Warning	DVN	Johnson, Louisa, Muscatine	49 min
Jun 23, 4:03 PM CDT	Severe Thunderstorm Warning	DVN	Carroll	30 min
Jun 23, 4:12 PM CDT	Tornado Warning	DVN	Rock Island	48 min
Jun 23, 4:19 PM CDT	Severe Thunderstorm Warning	LOT	Lee, Ogle	41 min
Jun 23, 4:28 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Mercer, Rock Island	62 min
Jun 23, 4:40 PM CDT	Tornado Warning	LOT	DeKalb, Lee	50 min
Jun 23, 4:53 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Henry, Mercer, Warren	67 min
Jun 23, 5:01 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Lee, Ogle	44 min
Jun 23, 5:01 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Kane	59 min
Jun 23, 5:05 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	55 min
Jun 23, 5:12 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Kane, Kendall, LaSalle	33 min
Jun 23, 5:14 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, Henderson, McDonough	61 min
Jun 23, 5:20 PM CDT	Severe Thunderstorm Warning	ILX	Knox, Marshall, Peoria, Stark	55 min
Jun 23, 5:24 PM CDT	Flash Flood Warning	LOT	Lee, Ogle	2 hr
Jun 23, 5:25 PM CDT	Flash Flood Warning	DVN	Bureau, Henry, Putnam, Whiteside	6 hr
Jun 23, 5:29 PM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Grundy, Kane, Kendall, LaSalle and 1 more	61 min
Jun 23, 5:30 PM CDT	Flash Flood Warning	DVN	Hancock, Henderson, McDonough, Warren	6 hr
Jun 23, 5:36 PM CDT	Flash Flood Warning	ILX	Knox, Stark	5 hr
Jun 23, 5:37 PM CDT	Severe Thunderstorm Warning	ILX	Knox	53 min
Jun 23, 5:39 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	66 min
Jun 23, 5:39 PM CDT	Tornado Warning	LOT	Cook, DuPage	66 min
Jun 23, 5:42 PM CDT	Flash Flood Warning	LOT	Cook, DeKalb, DuPage, Kane	4 hr
Jun 23, 5:44 PM CDT	Tornado Warning	DVN	Warren	46 min
Jun 23, 5:47 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Peoria, Stark, Woodford	58 min
Jun 23, 5:57 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	35 min
Jun 23, 6:00 PM CDT	Severe Thunderstorm Warning	LOT	DuPage	30 min
Jun 23, 6:02 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Peoria	43 min
Jun 23, 6:03 PM CDT	Tornado Warning	LOT	Cook, DuPage, Will	57 min
Jun 23, 6:16 PM CDT	Flash Flood Warning	ILX	Marshall, Peoria	4 hr
Jun 23, 6:23 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	67 min
Jun 23, 6:24 PM CDT	Tornado Warning	LOT	Cook	25 min
Jun 23, 6:28 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston, Will	62 min
Jun 23, 6:30 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, McDonough, Warren	46 min
Jun 23, 6:33 PM CDT	Tornado Warning	LOT	Ford, Grundy, Iroquois, Kankakee, Livingston	27 min
Jun 23, 6:37 PM CDT	Severe Thunderstorm Warning	ILX	Peoria, Tazewell, Woodford	38 min
Jun 23, 6:45 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason, Schuyler	60 min
Jun 23, 6:48 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	42 min
Jun 23, 6:49 PM CDT	Severe Thunderstorm Warning	ILX	Woodford	41 min
Jun 23, 6:52 PM CDT	Flash Flood Warning	ILX	Fulton, Knox	4 hr
Jun 23, 7:04 PM CDT	Flash Flood Warning	ILX	Fulton, Peoria, Tazewell, Woodford	4 hr
Jun 23, 7:08 PM CDT	Severe Thunderstorm Warning	ILX	McLean, Tazewell, Woodford	52 min
Jun 23, 7:10 PM CDT	Flash Flood Warning	LOT	Cook, Ford, Grundy, Iroquois, Kankakee, LaSalle and 2 more	3 hr
Jun 23, 7:16 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee	89 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, 7.2 hours before the alert went out and 221 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1735 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 1302 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 22, 11:47 PM CDT	Mesoscale Discussion	SPC	Jo Daviess	88 min
Jun 23, 1:29 AM CDT	Tornado Watch	SPC	Carroll, Jo Daviess, Stephenson	7 hr
Jun 23, 3:38 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 14 more	6 hr
Jun 23, 8:31 AM CDT	Mesoscale Discussion	SPC	Grundy, Kankakee, LaSalle, Livingston, Marshall, Putnam and 3 more	59 min
Jun 23, 1:01 PM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, Cook, DeKalb, DuPage, Ford and 23 more	59 min
Jun 23, 2:44 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calhoun, Greene, Jersey, Pike	7 hr
Jun 23, 5:56 PM CDT	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Ford, Fulton and 23 more	94 min
Jun 23, 6:29 PM CDT	Mesoscale Discussion	SPC	Adams, Hancock	2 hr
Jun 23, 6:50 PM CDT	Severe Thunderstorm Watch	SPC	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 12 more	5 hr
Jun 22, 7:08 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Benton, Black Hawk, Boone and 66 more	2 hr
Jun 22, 7:56 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	8 hr
Jun 22, 9:00 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 49 more	9 hr
Jun 22, 9:59 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 20 more	91 min
Jun 22, 10:49 PM CDT	Tornado Watch	SPC	Butler, Calhoun, Cerro Gordo, Franklin, Grundy, Hamilton and 8 more	7 hr
Jun 23, 12:01 AM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more	3 hr
Jun 23, 12:40 AM CDT	Mesoscale Discussion	SPC	Butler, Cerro Gordo, Chickasaw, Clay, Dickinson, Emmet and 15 more	95 min
Jun 23, 2:36 AM CDT	Severe Thunderstorm Watch	SPC	Howard, Mitchell	5 hr
Jun 23, 5:46 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 28 more	59 min
Jun 23, 2:48 PM CDT	Mesoscale Discussion	SPC	Allamakee, Winneshiek	87 min
Jun 22, 8:58 PM CDT	Mesoscale Discussion	SPC	Dickinson, Gogebic, Iron	92 min
Jun 23, 1:49 AM CDT	Mesoscale Discussion	SPC	Baraga, Gogebic, Iron	86 min
Jun 23, 2:47 AM CDT	Mesoscale Discussion	SPC	Lake, Manistee, Mason, Muskegon, Newaygo, Oceana and 1 more	88 min
Jun 23, 6:26 AM CDT	Mesoscale Discussion	SPC	Barry, Calhoun, Clare, Clinton, Eaton, Genesee and 21 more	64 min
Jun 23, 6:40 AM CDT	Severe Thunderstorm Watch	SPC	Allegan, Arenac, Barry, Bay, Berrien, Branch and 41 more	7 hr
Jun 23, 10:52 AM CDT	Mesoscale Discussion	SPC	Branch, Calhoun, Cass, Genesee, Hillsdale, Ingham and 13 more	53 min
Jun 23, 6:16 PM CDT	Tornado Watch	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 11 more	5 hr
Jun 23, 2:12 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Carroll, Clay and 16 more	93 min

Nearby

Tornado Watches in Illinois, 2010 Tornado Watches in Iowa, 2010 Tornado Watches in Missouri, 2010 Every 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.