Alert archive / Illinois / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 381

June 4, 200233 counties in Illinois; 14 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 4, 2002, 5:00 PM CDT for 33 counties in Illinois; 14 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 4, 2002, 5:00 PM CDT (22:00 UTC)
Expired
Jun 4, 2002, 10:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 47 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, DeWitt County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Marion County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO, Washington County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 4, 5:11 PM CDTSevere Thunderstorm WarningILXTazewell64 min
Jun 4, 5:32 PM CDTSevere Thunderstorm WarningILXMcLean58 min
Jun 4, 6:10 PM CDTSevere Thunderstorm WarningILXSangamon80 min
Jun 4, 6:36 PM CDTFlash Flood WarningILXMorgan, Scott3 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.0 hours before the alert went out and 176 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 2002-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1332 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 2002-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.193958Sfc1 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
1332 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1268 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 3, 7:45 PM CDTSevere Thunderstorm WatchSPCCook, DeKalb, DuPage, Grundy, Kane, Kendall and 2 more3 hr
Jun 4, 3:30 PM CDTSevere Thunderstorm WatchSPCFord, Grundy, Iroquois, Kankakee, Will6 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2002Severe Thunderstorm Watches in Missouri, 2002Every severe thunderstorm watch in 2002

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.