Alert archive / Illinois / Tornado Watches in 2010

Tornado Watch 117

April 30, 201053 counties in Illinois; 6 counties in Kentucky; 23 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 30, 2010, 9:03 PM CDT for 53 counties in Illinois; 6 counties in Kentucky; 23 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2010, 9:03 PM CDT (02:03 UTC)
Expired
May 1, 2010, 3:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 82 counties

Alexander County, IL, Bond 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, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Greene County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Sangamon County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO

The radar

The St Louis radar (KLSX), 95 km from the middle of the area, began a volume at 02:06 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 30, 9:10 PM CDTTornado WarningLSXIron, Madison50 min
Apr 30, 9:23 PM CDTTornado WarningLSXSainte Genevieve, Saint Francois37 min
Apr 30, 9:25 PM CDTTornado WarningLSXClinton, Madison, Saint Clair, Washington34 min
Apr 30, 9:34 PM CDTSevere Thunderstorm WarningPAHBollinger, Perry, Wayne41 min
Apr 30, 9:51 PM CDTTornado WarningLSXRandolph39 min
Apr 30, 10:05 PM CDTFlash Flood WarningPAHWayne4 hr
Apr 30, 10:06 PM CDTSevere Thunderstorm WarningPAHJackson39 min
Apr 30, 10:47 PM CDTFlash Flood WarningPAHBollinger4 hr
Apr 30, 10:54 PM CDTSevere Thunderstorm WarningPAHFranklin, Jefferson, Perry36 min
Apr 30, 11:16 PM CDTTornado WarningPAHButler, Ripley29 min
Apr 30, 11:26 PM CDTSevere Thunderstorm WarningPAHAlexander, Jackson, Union, Williamson34 min
Apr 30, 11:34 PM CDTFlash Flood WarningPAHCape Girardeau, Perry4 hr
Apr 30, 11:56 PM CDTSevere Thunderstorm WarningPAHAlexander, Pulaski, Union22 min
May 1, 12:37 AM CDTSevere Thunderstorm WarningILXCrawford, Lawrence38 min
May 1, 12:51 AM CDTSevere Thunderstorm WarningILXClark, Crawford26 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 7:12 PM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Christian, Clinton and 29 more63 min
Apr 30, 7:32 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, DuPage, Grundy and 16 more58 min
Apr 30, 8:36 PM CDTMesoscale DiscussionSPCAlexander, Bond, Christian, Clay, Clinton, Coles and 32 more54 min
Apr 30, 11:41 PM CDTMesoscale DiscussionSPCAlexander, Bond, Champaign, Christian, Clark, Clay and 39 more64 min
May 1, 1:11 AM CDTTornado WatchSPCBreckinridge, Butler, Caldwell, Calloway, Christian, Crittenden and 17 more6 hr
May 1, 2:54 AM CDTMesoscale DiscussionSPCAllen, Anderson, Barren, Boone, Breckinridge, Bullitt and 38 more2 hr
May 1, 4:40 AM CDTTornado WatchSPCAdair, Allen, Barren, Boyle, Bullitt, Casey and 21 more4 hr
May 1, 6:17 AM CDTMesoscale DiscussionSPCAdair, Barren, Bath, Boyle, Casey, Clark and 25 more88 min
Apr 30, 7:26 PM CDTMesoscale DiscussionSPCHowell, Oregon, Shannon2 hr
Apr 30, 9:09 PM CDTTornado Watch PDSSPCDunklin, Pemiscot7 hr
Apr 30, 10:43 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot62 min
May 1, 2:25 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot95 min
May 1, 7:48 AM CDTMesoscale DiscussionSPCDunklin, Pemiscot57 min
May 1, 3:11 PM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Dade, Dallas, Greene and 7 more94 min

Nearby

Tornado Watches in Illinois, 2010Tornado Watches in Missouri, 2010Tornado Watches in Kentucky, 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; radar from the NEXRAD Level II archive.