Alert archive / Illinois / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 315

May 9, 200334 counties in Illinois; 7 counties in Indiana; 4 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2003, 12:05 AM CDT for 34 counties in Illinois; 7 counties in Indiana; 4 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2003, 12:05 AM CDT (05:05 UTC)
Expired
May 9, 2003, 6:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 45 counties

Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Iroquois County, IL, Jersey County, IL, Kankakee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Newton County, IN, Porter County, IN, Vermillion County, IN, Warren County, IN, City of Saint Louis, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The Lincoln radar (KILX), 31 km from the middle of the area, began a volume at 05:09 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

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

IssuedProductOfficeCountiesLasted
May 9, 12:08 AM CDTSevere Thunderstorm WarningILXChampaign52 min
May 9, 12:33 AM CDTSevere Thunderstorm WarningILXVermilion42 min
May 9, 12:57 AM CDTSevere Thunderstorm WarningINDWarren48 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, 5.1 hours before the alert went out and 75 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 2003-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2003-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
743 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 7:06 PM CDTMesoscale DiscussionSPCHamilton, White54 min
May 8, 7:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Hancock, Henderson, Pike, Scott5 hr
May 8, 9:10 PM CDTSevere Thunderstorm WatchSPCBureau, Carroll, Cass, Champaign, DeKalb, DeWitt and 32 more6 hr
May 8, 9:27 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Carroll, Cass, Champaign and 40 more93 min
May 8, 11:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Henderson, Pike, Scott55 min
May 9, 2:02 PM CDTMesoscale DiscussionSPCEdwards, Lawrence, Wabash, Wayne, White2 hr
May 9, 2:48 PM CDTMesoscale DiscussionSPCClinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 15 more117 min
May 9, 4:17 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more28 min
May 9, 4:45 PM CDTTornado WatchSPCCalhoun, Greene, Morgan, Pike, Scott6 hr
May 9, 5:44 PM CDTMesoscale DiscussionSPCChampaign, Christian, Clark, Coles, Cumberland, DeWitt and 15 more31 min
May 9, 6:05 PM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clinton, Coles and 13 more5 hr
May 9, 1:21 AM CDTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 51 more84 min
May 9, 1:45 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 34 more5 hr
May 9, 5:04 AM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 34 more86 min
May 9, 2:40 PM CDTSevere Thunderstorm WatchSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 22 more5 hr
May 8, 7:13 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Buchanan, Caldwell, Carroll and 23 more2 hr
May 8, 9:00 PM CDTTornado WatchSPCAudrain, Benton, Boone, Callaway, Camden, Cole and 26 more5 hr

Nearby

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