Alert archive / Indiana / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 189

April 30, 200321 counties in Illinois; 23 counties in Indiana; 4 counties in Michigan

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2003, 5:50 PM CDT for 21 counties in Illinois; 23 counties in Indiana; 4 counties in Michigan. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2003, 5:50 PM CDT (22:50 UTC)
Expired
Apr 30, 2003, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 48 counties

Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Allen County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI

The radar

The Chicago radar (KLOT), 20 km from the middle of the area, began a volume at 22:51 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

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

IssuedProductOfficeCountiesLasted
Apr 30, 6:00 PM CDTSevere Thunderstorm WarningIWXNoble60 min
Apr 30, 6:01 PM CDTSevere Thunderstorm WarningIWXNoble59 min
Apr 30, 6:35 PM CDTSevere Thunderstorm WarningIWXDeKalb55 min
Apr 30, 7:12 PM CDTTornado WarningILXKnox63 min
Apr 30, 7:20 PM CDTTornado WarningDVNHenry55 min
Apr 30, 8:17 PM CDTTornado WarningILXKnox58 min
Apr 30, 8:22 PM CDTTornado WarningDVNHenry38 min
Apr 30, 8:35 PM CDTTornado WarningILXStark55 min
Apr 30, 8:44 PM CDTTornado WarningDVNBureau61 min
Apr 30, 8:55 PM CDTTornado WarningDVNBureau50 min
Apr 30, 9:02 PM CDTSevere Thunderstorm WarningDVNHenry58 min
Apr 30, 9:16 PM CDTSevere Thunderstorm WarningILXKnox74 min
Apr 30, 9:24 PM CDTFlash Flood WarningDVNHenry5 hr
Apr 30, 9:31 PM CDTSevere Thunderstorm WarningILXStark59 min
Apr 30, 9:37 PM CDTTornado WarningDVNPutnam38 min
Apr 30, 9:39 PM CDTSevere Thunderstorm WarningLOTCook, Will51 min
Apr 30, 9:44 PM CDTFlash Flood WarningILXKnox, Stark6 hr
Apr 30, 9:44 PM CDTSevere Thunderstorm WarningILXMarshall61 min
Apr 30, 9:46 PM CDTTornado WarningLOTLaSalle44 min
Apr 30, 9:48 PM CDTTornado WarningDVNBureau57 min
Apr 30, 10:15 PM CDTTornado WarningDVNPutnam45 min
Apr 30, 10:27 PM CDTTornado WarningLOTLaSalle33 min
Apr 30, 10:31 PM CDTSevere Thunderstorm WarningILXKnox59 min
Apr 30, 10:48 PM CDTSevere Thunderstorm WarningLOTLivingston57 min
Apr 30, 10:58 PM CDTSevere Thunderstorm WarningLOTGrundy, Kendall, LaSalle47 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, 10.8 hours before the alert went out and 151 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 2003-04-30Temperature 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 12:00Z on 2003-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 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
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.

IssuedProductOfficeCountiesLasted
Apr 30, 11:04 AM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more116 min
Apr 30, 12:22 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, Christian, Coles and 37 more113 min
Apr 30, 1:00 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Bureau, Cass, Champaign, DeWitt and 30 more5 hr
Apr 30, 3:24 PM CDTMesoscale DiscussionSPCAdams, Brown, Bureau, Cass, Champaign, DeWitt and 32 more2 hr
Apr 30, 5:15 PM CDTTornado WatchSPCAdams, Hancock, Henderson, McDonough, Mercer, Rock Island and 2 more6 hr

Nearby

Severe Thunderstorm Watches in Indiana, 2003Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Michigan, 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.