Alert archive / Illinois / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 193

April 30, 200328 counties in Illinois; 5 counties in Indiana; 10 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2003, 10:55 PM CDT for 28 counties in Illinois; 5 counties in Indiana; 10 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 10:55 PM CDT (03:55 UTC)
Expired
May 1, 2003, 4:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 43 counties

Adams County, IL, Brown County, IL, Cass County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Iroquois County, IL, Kankakee County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Audrain County, MO, Boone County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Shelby County, MO

The radar

The Lincoln radar (KILX), 82 km from the middle of the area, began a volume at 03:56 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

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

IssuedProductOfficeCountiesLasted
Apr 30, 10:58 PM CDTSevere Thunderstorm WarningLOTGrundy, Kendall, LaSalle47 min
Apr 30, 11:28 PM CDTSevere Thunderstorm WarningLOTDuPage, Kankakee, Will62 min
Apr 30, 11:57 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis48 min
May 1, 12:22 AM CDTSevere Thunderstorm WarningLSXAdams23 min
May 1, 1:15 AM CDTSevere Thunderstorm WarningLSXShelby45 min
May 1, 1:17 AM CDTFlash Flood WarningILXMarshall6 hr
May 1, 1:44 AM CDTTornado WarningILXMcLean31 min
May 1, 1:56 AM CDTSevere Thunderstorm WarningLOTLivingston34 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 00:00Z, 3.9 hours before the alert went out and 143 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 00:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1938 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 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
1938 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1356 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.8
Supercell composite
7.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 7:31 PM CDTMesoscale DiscussionSPCAdams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more119 min
Apr 30, 10:31 PM CDTMesoscale DiscussionSPCAdams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more89 min
May 1, 1:19 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, DeWitt, Ford, Fulton and 18 more86 min
May 1, 7:51 AM CDTMesoscale DiscussionSPCAlexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 14 more114 min
May 1, 9:35 AM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 9 more5 hr
May 1, 12:15 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin5 hr
May 1, 12:09 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 26 more3 hr
May 1, 12:50 PM CDTSevere Thunderstorm WatchSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 43 more5 hr
May 1, 3:10 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 35 more95 min
Apr 30, 9:22 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cass, Cedar and 19 more83 min
Apr 30, 9:30 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 25 more6 hr
May 1, 12:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Carroll, Cass and 24 more90 min
May 1, 2:27 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cedar and 17 more2 hr

Nearby

Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Missouri, 2003Severe Thunderstorm Watches in Indiana, 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; radar from the NEXRAD Level II archive.