Alert archive / Illinois / Tornado Watches in 2013

Tornado Watch 251

May 30, 201363 counties in Illinois; 21 counties in Iowa; 34 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 30, 2013, 12:32 PM CDT for 63 counties in Illinois; 21 counties in Iowa; 34 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2013, 12:32 PM CDT (17:32 UTC)
Expired: May 30, 2013, 8:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 118 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque 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, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Adams County, IL, Bond County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Carroll County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, DeKalb County, IL, DeWitt County, IL, Fayette County, IL, Franklin County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Jo Daviess County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Putnam County, IL, Randolph County, IL, Rock Island County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Washington County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Audrain County, MO, Bollinger County, MO, Boone County, MO, Callaway County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Perry County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 75 km from the middle of the area, began a volume at 17:35 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: 70%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 10%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 30, 1:20 PM CDT	Severe Thunderstorm Warning	PAH	Jackson	40 min
May 30, 1:26 PM CDT	Severe Thunderstorm Warning	DVN	Mercer, Rock Island	49 min
May 30, 1:37 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Whiteside	53 min
May 30, 2:00 PM CDT	Severe Thunderstorm Warning	LOT	Lee	60 min
May 30, 2:16 PM CDT	Tornado Warning	DVN	Dubuque	29 min
May 30, 2:38 PM CDT	Severe Thunderstorm Warning	LSX	Knox	22 min
May 30, 2:41 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Lee, Van Buren	49 min
May 30, 2:43 PM CDT	Tornado Warning	PAH	Perry	32 min
May 30, 2:55 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston, Will	65 min
May 30, 3:09 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island, Whiteside	51 min
May 30, 3:15 PM CDT	Tornado Warning	PAH	Jefferson, Perry	30 min
May 30, 3:26 PM CDT	Severe Thunderstorm Warning	ILX	Logan, McLean, Marshall, Tazewell, Woodford	49 min
May 30, 3:28 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, Henderson	47 min
May 30, 3:34 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, LaSalle, Livingston	56 min
May 30, 3:59 PM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Rock Island, Warren	46 min
May 30, 4:02 PM CDT	Severe Thunderstorm Warning	DVN	Hancock, Henderson, McDonough, Warren	58 min
May 30, 4:15 PM CDT	Tornado Warning Tornado observed	DVN	Muscatine	30 min
May 30, 4:16 PM CDT	Severe Thunderstorm Warning	LOT	DeKalb, Grundy, Kane, Kendall, LaSalle, Will	59 min
May 30, 4:21 PM CDT	Severe Thunderstorm Warning	ILX	Fulton, Knox, Schuyler	54 min
May 30, 4:27 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Cedar, Delaware, Dubuque, Johnson and 2 more	63 min
May 30, 4:30 PM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau	6 hr
May 30, 4:36 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Henry, Mercer, Rock Island, Whiteside	54 min
May 30, 5:01 PM CDT	Flash Flood Warning	LSX	Adams, Pike	6 hr
May 30, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Pike	51 min
May 30, 5:23 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	67 min
May 30, 5:30 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Putnam, Whiteside	60 min
May 30, 5:32 PM CDT	Tornado Warning	DVN	Henry, Whiteside	28 min
May 30, 5:50 PM CDT	Severe Thunderstorm Warning	LOT	LaSalle, Lee, Ogle, Winnebago	70 min
May 30, 5:51 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	39 min
May 30, 6:09 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	36 min
May 30, 6:11 PM CDT	Flash Flood Warning	ILX	Fulton, Knox	6 hr
May 30, 6:24 PM CDT	Severe Thunderstorm Warning	LSX	Randolph, Saint Clair, Washington	36 min
May 30, 6:29 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	46 min
May 30, 6:36 PM CDT	Flash Flood Warning	ILX	Fulton, Schuyler	6 hr
May 30, 6:38 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	37 min
May 30, 6:42 PM CDT	Severe Thunderstorm Warning	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	78 min
May 30, 6:52 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Madison	38 min
May 30, 7:01 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison	29 min
May 30, 7:38 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	22 min
May 30, 7:43 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon, Sangamon	47 min
May 30, 7:45 PM CDT	Severe Thunderstorm Warning	ILX	Menard, Sangamon	45 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, 5.5 hours before the alert went out and 209 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: 1076 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 11:20 AM CDT	Mesoscale Discussion	SPC	Jo Daviess, Stephenson	115 min
May 30, 11:29 AM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Bureau, Calhoun, Cass and 47 more	61 min
May 30, 2:16 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Boone, Brown, Bureau, Calhoun and 53 more	59 min
May 30, 3:52 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Boone, Brown, Bureau, Calhoun and 56 more	113 min
May 30, 5:48 PM CDT	Severe Thunderstorm Watch	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more	6 hr
May 29, 9:00 PM CDT	Mesoscale Discussion	SPC	Allamakee, Appanoose, Benton, Buchanan, Clayton, Davis and 16 more	60 min
May 29, 9:36 PM CDT	Mesoscale Discussion	SPC	Adair, Buena Vista, Calhoun, Carroll, Clay, Emmet and 6 more	54 min
May 30, 11:56 AM CDT	Tornado Watch	SPC	Allamakee, Clayton, Fayette, Winneshiek	7 hr
May 30, 1:33 PM CDT	Mesoscale Discussion	SPC	Allamakee, Clayton, Fayette, Winneshiek	57 min
May 30, 3:34 PM CDT	Mesoscale Discussion	SPC	Allamakee, Clayton, Fayette, Winneshiek	116 min
May 30, 5:58 PM CDT	Mesoscale Discussion	SPC	Clayton	62 min
May 30, 11:44 AM CDT	Mesoscale Discussion	SPC	Barry, Barton, Benton, Camden, Cedar, Christian and 23 more	91 min
May 30, 1:21 PM CDT	Tornado Watch	SPC	Barry, Barton, Benton, Camden, Cedar, Chariton and 37 more	8 hr
May 30, 2:35 PM CDT	Mesoscale Discussion	SPC	Barry, Jasper, McDonald, Newton	55 min
May 30, 5:23 PM CDT	Mesoscale Discussion	SPC	Barry, Camden, Christian, Dallas, Douglas, Greene and 13 more	2 hr

Nearby

Tornado Watches in Illinois, 2013 Tornado Watches in Missouri, 2013 Tornado Watches in Iowa, 2013 Every tornado watch in 2013

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.