Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 820

May 7, 200328 counties in Illinois; 49 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 7, 2003, 12:42 PM CDT for 28 counties in Illinois; 49 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2003, 12:42 PM CDT (17:42 UTC)
Expired
May 7, 2003, 2:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 77 counties

Champaign County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Livingston County, IL, Macon County, IL, McLean County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, Will County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Fountain County, IN, Fulton County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Howard County, IN, Jackson County, IN, Jasper County, IN, Johnson County, IN, Knox County, IN, Lake County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Porter County, IN, Pulaski County, IN, Putnam County, IN, Starke County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, White County, IN

The radar

The Indianapolis radar (KIND), 103 km from the middle of the area, began a volume at 17:45 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 5.7 hours before the alert went out and 101 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 2003-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2003-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
1140 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
52 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 6, 7:03 PM CDTMesoscale DiscussionSPCClinton, Franklin, Hamilton, Jackson, Jefferson, Madison and 7 more117 min
May 6, 9:35 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 12 more115 min
May 6, 11:50 PM CDTTornado WatchSPCGallatin, Hamilton, Hardin, Johnson, Massac, Pope and 2 more6 hr
May 7, 1:16 AM CDTMesoscale DiscussionSPCHarrison3 hr
May 7, 1:41 AM CDTMesoscale DiscussionSPCFloyd, Harrison, Perry, Spencer3 hr
May 7, 6:06 PM CDTMesoscale DiscussionSPCAdams, Allen, Benton, Carroll, Cass, DeKalb and 20 more114 min

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Every mesoscale discussion 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.