Alert archive / Illinois / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 429

June 5, 201143 counties in Illinois; 13 counties in Iowa; 11 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 5, 2011, 5:00 AM CDT for 43 counties in Illinois; 13 counties in Iowa; 11 counties in Missouri. It took effect at Jun 5, 2011, 5:05 AM CDT. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 5, 2011, 5:00 AM CDT (10:00 UTC)
In effect from
Jun 5, 2011, 5:05 AM CDT
Expired
Jun 5, 2011, 12:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 67 counties

Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson 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, Mason County, IL, McDonough County, IL, Menard County, IL, Mercer County, IL, Montgomery County, IL, Morgan County, IL, Peoria 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, Warren County, IL, Washington County, IL, City of Saint Louis, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 161 km from the middle of the area, began a volume at 10:02 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 5, 5:05 AM CDTSevere Thunderstorm WarningILXMorgan, Scott55 min
Jun 5, 5:46 AM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey, Macoupin44 min
Jun 5, 5:50 AM CDTSevere Thunderstorm WarningILXMorgan, Sangamon55 min
Jun 5, 6:13 AM CDTFlash Flood WarningDVNHancock, Henderson, McDonough, Warren6 hr
Jun 5, 6:22 AM CDTSevere Thunderstorm WarningDVNIowa, Johnson, Washington53 min
Jun 5, 6:33 AM CDTSevere Thunderstorm WarningLSXFayette, Macoupin, Montgomery57 min
Jun 5, 6:58 AM CDTSevere Thunderstorm WarningDVNHancock, McDonough20 min
Jun 5, 7:27 AM CDTSevere Thunderstorm WarningLSXBond, Fayette, Marion, Montgomery48 min
Jun 5, 7:34 AM CDTFlash Flood WarningILXCass, Morgan, Schuyler, Scott5 hr
Jun 5, 7:36 AM CDTSevere Thunderstorm WarningLSXBrown23 min
Jun 5, 7:38 AM CDTSevere Thunderstorm WarningILXChristian, Effingham, Shelby67 min
Jun 5, 8:15 AM CDTSevere Thunderstorm WarningILXMarshall, Peoria, Stark, Woodford42 min
Jun 5, 8:36 AM CDTSevere Thunderstorm WarningILXClay, Effingham, Jasper, Richland39 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 00:00Z, 10.0 hours before the alert went out and 165 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2011-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3326 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2011-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
3326 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1196 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 7:55 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Crawford, Cumberland and 13 more65 min
Jun 5, 2:52 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 36 more2 hr
Jun 5, 7:27 AM CDTMesoscale DiscussionSPCClay, Crawford, Cumberland, Edwards, Franklin, Gallatin and 12 more2 hr
Jun 5, 5:17 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Boone, Buchanan, Buena Vista, Butler and 19 more88 min

Nearby

Severe Thunderstorm Watches in Illinois, 2011Severe Thunderstorm Watches in Iowa, 2011Severe Thunderstorm Watches in Missouri, 2011Every severe thunderstorm watch in 2011

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.