Alert archive / Illinois / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 665

July 22, 200430 counties in Illinois; 15 counties in Indiana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 22, 2004, 12:20 PM CDT for 30 counties in Illinois; 15 counties in Indiana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 22, 2004, 12:20 PM CDT (17:20 UTC)
Expired
Jul 22, 2004, 6:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 45 counties

Bureau County, IL, Champaign County, IL, Coles County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, McLean County, IL, Moultrie County, IL, Ogle County, IL, Piatt County, IL, Putnam County, IL, Shelby County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Clay County, IN, Fountain County, IN, Jasper County, IN, Lake County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Putnam County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, White County, IN

The radar

The Chicago radar (KLOT), 68 km from the middle of the area, began a volume at 17:22 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

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

IssuedProductOfficeCountiesLasted
Jul 22, 12:32 PM CDTSevere Thunderstorm WarningILXLogan58 min
Jul 22, 1:09 PM CDTSevere Thunderstorm WarningILXDeWitt, Macon66 min
Jul 22, 1:23 PM CDTSevere Thunderstorm WarningLOTGrundy, Kendall, LaSalle37 min
Jul 22, 1:32 PM CDTSevere Thunderstorm WarningILXDeWitt, Macon43 min
Jul 22, 1:46 PM CDTSevere Thunderstorm WarningILXPiatt59 min
Jul 22, 1:51 PM CDTSevere Thunderstorm WarningLOTWill54 min
Jul 22, 1:54 PM CDTTornado WarningILXPiatt51 min
Jul 22, 1:55 PM CDTSevere Thunderstorm WarningILXChampaign, Douglas65 min
Jul 22, 2:01 PM CDTSevere Thunderstorm WarningLOTKendall29 min
Jul 22, 2:09 PM CDTSevere Thunderstorm WarningILXMoultrie, Shelby66 min
Jul 22, 2:21 PM CDTTornado WarningILXDouglas39 min
Jul 22, 2:28 PM CDTSevere Thunderstorm WarningILXColes62 min
Jul 22, 2:54 PM CDTSevere Thunderstorm WarningILXClark, Edgar66 min
Jul 22, 3:05 PM CDTFlash Flood WarningILXShelby6 hr
Jul 22, 3:08 PM CDTSevere Thunderstorm WarningINDVigo52 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, 5.3 hours before the alert went out and 112 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, Lincoln, IL at 12:00Z on 2004-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1619 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2004-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.1939Sfc1 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
1619 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
917 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 22, 11:59 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Ford, Grundy, Iroquois, Kankakee and 10 more2 hr
Jul 22, 1:52 PM CDTMesoscale DiscussionSPCChampaign, Clark, Coles, Crawford, Cumberland, Douglas and 10 more83 min
Jul 22, 3:05 PM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 20 more6 hr
Jul 22, 6:08 PM CDTMesoscale DiscussionSPCJersey, Madison, Monroe, Saint Clair97 min
Jul 22, 6:42 PM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 9 more93 min
Jul 21, 7:49 PM CDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 41 more56 min
Jul 21, 9:16 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Brown, Clay, Dearborn and 21 more59 min
Jul 22, 3:45 PM CDTSevere Thunderstorm WatchSPCSpencer5 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Indiana, 2004Every severe thunderstorm watch in 2004

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.