Alert archive / Indiana / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 187

April 30, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2003, 1:00 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 30, 2003, 1:00 PM CDT (18:00 UTC)
Expired: Apr 30, 2003, 6:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 83 counties

Des Moines County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Adams County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, Champaign County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Knox 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, Mercer County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Delaware County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Randolph County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI

The radar

The Chicago radar (KLOT), 84 km from the middle of the area, began a volume at 18:01 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

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

Issued	Product	Office	Counties	Lasted
Apr 30, 1:09 PM CDT	Severe Thunderstorm Warning	DVN	Scott	36 min
Apr 30, 1:11 PM CDT	Severe Thunderstorm Warning	DVN	Scott	34 min
Apr 30, 1:28 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	47 min
Apr 30, 2:12 PM CDT	Severe Thunderstorm Warning	IWX	Adams	33 min
Apr 30, 2:46 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee, Livingston	44 min
Apr 30, 4:00 PM CDT	Severe Thunderstorm Warning	IWX	Starke	60 min
Apr 30, 4:05 PM CDT	Severe Thunderstorm Warning	IWX	Pulaski	40 min
Apr 30, 4:23 PM CDT	Severe Thunderstorm Warning	IWX	Marshall	67 min
Apr 30, 5:09 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Washington	51 min
Apr 30, 5:15 PM CDT	Severe Thunderstorm Warning	IWX	Kosciusko	45 min
Apr 30, 5:26 PM CDT	Severe Thunderstorm Warning	LOT	Kankakee	34 min
Apr 30, 5:27 PM CDT	Tornado Warning	DVN	Henry, Louisa	33 min
Apr 30, 5:56 PM CDT	Tornado Warning	DVN	Mercer	64 min
Apr 30, 6:00 PM CDT	Severe Thunderstorm Warning	IWX	Noble	60 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, 6.0 hours before the alert went out and 97 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 925 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 11:04 AM CDT	Mesoscale Discussion	SPC	Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more	116 min
Apr 30, 12:22 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Cass, Champaign, Christian, Coles and 37 more	113 min
Apr 30, 3:24 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, DeWitt and 32 more	2 hr
Apr 30, 5:15 PM CDT	Tornado Watch	SPC	Adams, Hancock, Henderson, McDonough, Mercer, Rock Island and 2 more	6 hr
Apr 30, 5:50 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Cook, DeKalb, DuPage, Grundy, Henry and 15 more	5 hr
Apr 29, 7:00 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 13 more	3 hr
Apr 29, 7:30 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 17 more	7 hr
Apr 29, 10:40 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 17 more	2 hr
Apr 30, 2:49 PM CDT	Mesoscale Discussion	SPC	Appanoose, Clarke, Decatur, Lucas, Monroe, Page and 3 more	116 min

Nearby

Severe Thunderstorm Watches in Indiana, 2003 Severe Thunderstorm Watches in Illinois, 2003 Severe Thunderstorm Watches in Iowa, 2003 Every 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.