Alert archive / Illinois / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 832

August 2, 200329 counties in Illinois; 24 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Aug 2, 2003, 4:30 PM CDT for 29 counties in Illinois; 24 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 2, 2003, 4:30 PM CDT (21:30 UTC)
Expired
Aug 2, 2003, 10:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 53 counties

Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Richland County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Chariton County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Lincoln County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Warren County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 2, 4:51 PM CDTSevere Thunderstorm WarningILXChristian54 min
Aug 2, 5:01 PM CDTSevere Thunderstorm WarningLSXGreene44 min
Aug 2, 6:05 PM CDTSevere Thunderstorm WarningLSXGreene40 min
Aug 2, 6:19 PM CDTSevere Thunderstorm WarningILXColes, Cumberland56 min
Aug 2, 6:36 PM CDTSevere Thunderstorm WarningLSXCalhoun24 min
Aug 2, 6:45 PM CDTSevere Thunderstorm WarningLSXJersey45 min
Aug 2, 7:21 PM CDTSevere Thunderstorm WarningSGFMorgan54 min
Aug 2, 7:44 PM CDTSevere Thunderstorm WarningLSXSaint Charles46 min
Aug 2, 7:49 PM CDTSevere Thunderstorm WarningLSXMacoupin, Madison41 min
Aug 2, 7:52 PM CDTSevere Thunderstorm WarningSGFMiller53 min
Aug 2, 7:53 PM CDTSevere Thunderstorm WarningILXClark37 min
Aug 2, 8:07 PM CDTSevere Thunderstorm WarningLSXSaint Louis38 min
Aug 2, 8:13 PM CDTSevere Thunderstorm WarningSGFCamden, Morgan62 min
Aug 2, 8:16 PM CDTSevere Thunderstorm WarningLSXCity of Saint Louis44 min
Aug 2, 8:47 PM CDTSevere Thunderstorm WarningILXEffingham58 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, 9.5 hours before the alert went out and 226 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 2003-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 773 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 2003-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
773 J/kg
Mixed-layer CIN
-109 J/kg
Mixed-layer LCL
1204 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 1, 7:20 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Hamilton, Jackson, Jefferson, Johnson and 8 more85 min
Aug 2, 4:30 AM CDTSevere Thunderstorm WatchSPCAlexander, Johnson, Massac, Pope, Pulaski, Union7 hr
Aug 2, 6:48 AM CDTMesoscale DiscussionSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more57 min
Aug 1, 11:54 PM CDTMesoscale DiscussionSPCBarton, Bates, Cedar, Vernon96 min
Aug 2, 1:05 AM CDTSevere Thunderstorm WatchSPCBarry, Barton, Bates, Camden, Cedar, Christian and 22 more6 hr
Aug 2, 3:26 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Camden, Cedar, Christian and 22 more64 min
Aug 2, 3:15 PM CDTMesoscale DiscussionSPCAudrain, Boone, Callaway, Cole, Cooper, Henry and 8 more2 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Missouri, 2003Every severe thunderstorm watch in 2003

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.