Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 1933

July 21, 200323 counties in Indiana; 11 counties in Kentucky; 8 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 5:03 AM EST for 23 counties in Indiana; 11 counties in Kentucky; 8 counties in Ohio. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2003, 5:03 AM EST (10:03 UTC)
Expired: Jul 21, 2003, 7:00 AM EST
In force: 117 min
Issued by: the Storm Prediction Center

All 42 counties

Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Floyd County, IN, Franklin County, IN, Greene County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Ohio County, IN, Orange County, IN, Ripley County, IN, Scott County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Boone County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Henry County, KY, Kenton County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Trimble County, KY, Butler County, OH, Clermont County, OH, Clinton County, OH, Greene County, OH, Hamilton County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 94 km from the middle of the area, began a volume at 09:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 784Jul 21, 5:10 AM EST

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 10.1 hours before the alert went out and 150 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: 756 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1300 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.9

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
Jul 20, 9:39 PM EST	Mesoscale Discussion	SPC	Elkhart, Kosciusko, LaGrange, LaPorte, Marshall, Noble and 3 more	66 min
Jul 20, 9:48 PM EST	Mesoscale Discussion	SPC	Lake, Newton	117 min
Jul 20, 10:15 PM EST	Severe Thunderstorm Watch	SPC	Lake, Porter	7 hr
Jul 20, 11:45 PM EST	Severe Thunderstorm Watch	SPC	Allen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 11 more	5 hr
Jul 21, 1:56 AM EST	Mesoscale Discussion	SPC	Bartholomew, Benton, Boone, Brown, Clay, Clinton and 20 more	2 hr
Jul 21, 3:15 AM EST	Severe Thunderstorm Watch	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 47 more	6 hr
Jul 21, 4:12 AM EST	Mesoscale Discussion	SPC	Gibson, Knox, Posey, Sullivan, Vanderburgh	2 hr
Jul 21, 5:10 AM EST	Severe Thunderstorm Watch	SPC	Dearborn, Decatur, Fayette, Franklin, Jay, Jefferson and 9 more	6 hr
Jul 21, 10:27 AM EST	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 29 more	2 hr
Jul 21, 3:26 PM EST	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Jasper, Kosciusko and 12 more	94 min
Jul 21, 6:39 AM EST	Mesoscale Discussion	SPC	Boyd, Bracken, Carter, Fleming, Greenup, Harrison and 5 more	96 min
Jul 21, 7:03 AM EST	Mesoscale Discussion	SPC	Allen, Anderson, Barren, Breckinridge, Bullitt, Butler and 31 more	117 min
Jul 21, 7:40 AM EST	Severe Thunderstorm Watch	SPC	Bath, Boyd, Carter, Elliott, Greenup, Lawrence and 3 more	5 hr
Jul 21, 11:55 AM EST	Severe Thunderstorm Watch	SPC	Adair, Allen, Barren, Boyle, Butler, Caldwell and 34 more	6 hr
Jul 21, 1:41 PM EST	Mesoscale Discussion	SPC	Bell, Floyd, Harlan, Knott, Leslie, Letcher and 3 more	64 min
Jul 21, 3:14 PM EST	Mesoscale Discussion	SPC	Allen, Christian, Cumberland, Logan, Monroe, Muhlenberg and 3 more	2 hr
Jul 21, 1:11 AM EST	Mesoscale Discussion	SPC	Allen, Ashland, Crawford, Cuyahoga, Erie, Geauga and 24 more	2 hr

Nearby

Mesoscale Discussions in Indiana, 2003 Mesoscale Discussions in Kentucky, 2003 Mesoscale Discussions in Ohio, 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.