Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 371

April 4, 200315 counties in Illinois; 59 counties in Indiana; Henderson County, Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 9:47 AM CST for 15 counties in Illinois; 59 counties in Indiana; Henderson County, Kentucky. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Apr 4, 2003, 9:47 AM CST (15:47 UTC)
Expired: Apr 4, 2003, 10:45 AM CST
In force: 58 min
Issued by: the Storm Prediction Center

All 75 counties

Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Gallatin County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL, Vermilion County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Benton County, IN, Blackford 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, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Gibson County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Warrick County, IN, Washington County, IN, White County, IN, Henderson County, KY

The radar

The Indianapolis radar (KIND), 82 km from the middle of the area, began a volume at 15:50 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, 3.8 hours before the alert went out and 178 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: 60 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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.

Issued	Product	Office	Counties	Lasted
Apr 4, 7:23 AM CST	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Champaign and 55 more	97 min
Apr 4, 11:10 AM CST	Mesoscale Discussion	SPC	Bond, Calhoun, Cass, Champaign, Christian, Clinton and 24 more	95 min
Apr 4, 12:05 PM CST	Tornado Watch	SPC	Adams, Brown, Calhoun, Cass, Greene, Jersey and 10 more	5 hr
Apr 4, 1:12 PM CST	Mesoscale Discussion	SPC	Bond, Brown, Calhoun, Cass, Champaign, Christian and 35 more	93 min
Apr 4, 1:29 PM CST	Mesoscale Discussion	SPC	Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more	91 min
Apr 4, 2:35 PM CST	Tornado Watch	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 26 more	5 hr
Apr 4, 3:10 PM CST	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Coles, Cumberland and 25 more	2 hr
Apr 4, 4:25 PM CST	Tornado Watch	SPC	Alexander, Bond, Clay, Clinton, Edwards, Franklin and 24 more	6 hr
Apr 4, 5:11 PM CST	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 24 more	2 hr

Nearby

Mesoscale Discussions in Indiana, 2003 Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Kentucky, 2003 Every 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.