Alert archive / Kentucky / Mesoscale Discussions in 2003

Mesoscale Discussion 1937

July 21, 200335 counties in Indiana; 39 counties in Kentucky; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 10:27 AM EST for 35 counties in Indiana; 39 counties in Kentucky; 5 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 21, 2003, 10:27 AM EST (15:27 UTC)
Expired
Jul 21, 2003, 12:30 PM EST
In force
2 hr
Issued by
the Storm Prediction Center
All 79 counties

Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Harrison 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, Perry County, IN, Pike County, IN, Posey County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Switzerland County, IN, Union County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Carroll County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Gallatin County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hopkins County, KY, Jefferson County, KY, Kenton County, KY, Larue County, KY, Logan County, KY, Lyon County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Todd County, KY, Trigg County, KY, Trimble County, KY, Union County, KY, Warren County, KY, Webster County, KY, Butler County, OH, Darke County, OH, Hamilton County, OH, Montgomery County, OH, Preble County, OH

The radar

The Louisville radar (KLVX), 64 km from the middle of the area, began a volume at 15:27 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 3.5 hours before the alert went out and 222 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, Nashville Metro, TN at 12:00Z on 2003-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1467 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, Nashville Metro, TN at 12:00Z on 2003-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 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
1467 J/kg
Mixed-layer CIN
-175 J/kg
Mixed-layer LCL
1108 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
117 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
Jul 20, 9:39 PM ESTMesoscale DiscussionSPCElkhart, Kosciusko, LaGrange, LaPorte, Marshall, Noble and 3 more66 min
Jul 20, 9:48 PM ESTMesoscale DiscussionSPCLake, Newton117 min
Jul 20, 10:15 PM ESTSevere Thunderstorm WatchSPCLake, Porter7 hr
Jul 20, 11:45 PM ESTSevere Thunderstorm WatchSPCAllen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 11 more5 hr
Jul 21, 1:56 AM ESTMesoscale DiscussionSPCBartholomew, Benton, Boone, Brown, Clay, Clinton and 20 more2 hr
Jul 21, 3:15 AM ESTSevere Thunderstorm WatchSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 47 more6 hr
Jul 21, 4:12 AM ESTMesoscale DiscussionSPCGibson, Knox, Posey, Sullivan, Vanderburgh2 hr
Jul 21, 5:03 AM ESTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 17 more117 min
Jul 21, 5:10 AM ESTSevere Thunderstorm WatchSPCDearborn, Decatur, Fayette, Franklin, Jay, Jefferson and 9 more6 hr
Jul 21, 3:26 PM ESTMesoscale DiscussionSPCAllen, DeKalb, Elkhart, Fulton, Jasper, Kosciusko and 12 more94 min
Jul 21, 6:39 AM ESTMesoscale DiscussionSPCBoyd, Bracken, Carter, Fleming, Greenup, Harrison and 5 more96 min
Jul 21, 7:03 AM ESTMesoscale DiscussionSPCAllen, Anderson, Barren, Breckinridge, Bullitt, Butler and 31 more117 min
Jul 21, 7:40 AM ESTSevere Thunderstorm WatchSPCBath, Boyd, Carter, Elliott, Greenup, Lawrence and 3 more5 hr
Jul 21, 11:55 AM ESTSevere Thunderstorm WatchSPCAdair, Allen, Barren, Boyle, Butler, Caldwell and 34 more6 hr
Jul 21, 1:41 PM ESTMesoscale DiscussionSPCBell, Floyd, Harlan, Knott, Leslie, Letcher and 3 more64 min
Jul 21, 3:14 PM ESTMesoscale DiscussionSPCAllen, Christian, Cumberland, Logan, Monroe, Muhlenberg and 3 more2 hr
Jul 21, 1:11 AM ESTMesoscale DiscussionSPCAllen, Ashland, Crawford, Cuyahoga, Erie, Geauga and 24 more2 hr

Nearby

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