Alert archive / Indiana / Mesoscale Discussions in 2013

Mesoscale Discussion 744

May 21, 20135 states

The Storm Prediction Center issued this mesoscale discussion at May 21, 2013, 2:59 AM CDT for 5 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 21, 2013, 2:59 AM CDT (07:59 UTC)
Expired: May 21, 2013, 4:30 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 74 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clinton County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Franklin County, IN, Gibson County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Pike County, IN, Posey County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Spencer County, IN, Tipton County, IN, Union County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Webster County, KY, Mississippi County, MO, Scott County, MO, Butler County, OH, Darke County, OH, Montgomery County, OH, Preble County, OH

The radar

The Evansville,IN radar (KVWX), 54 km from the middle of the area, began a volume at 08:02 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 00:00Z, 8.0 hours before the alert went out and 235 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: 1540 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1320 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.7

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
May 20, 7:17 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DeWitt, DuPage and 25 more	58 min
May 20, 7:39 PM CDT	Tornado Watch	SPC	Randolph	6 hr
May 20, 7:48 PM CDT	Severe Thunderstorm Watch	SPC	Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more	6 hr
May 20, 8:07 PM CDT	Mesoscale Discussion	SPC	Calhoun, Pike	23 min
May 20, 8:53 PM CDT	Mesoscale Discussion	SPC	Adams, Bond, Brown, Calhoun, Cass, Christian and 27 more	67 min
May 20, 10:25 PM CDT	Mesoscale Discussion	SPC	Alexander, Champaign, Clark, Clay, Coles, Crawford and 33 more	65 min
May 20, 10:56 PM CDT	Tornado Watch	SPC	Alexander, Champaign, Clark, Clay, Coles, Crawford and 29 more	6 hr
May 20, 11:15 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Cass, Elkhart, Fulton, Grant, Huntington and 16 more	5 hr
May 21, 7:47 AM CDT	Mesoscale Discussion	SPC	Fulton	58 min
May 21, 11:27 AM CDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Clinton, Cumberland, Logan and 7 more	63 min
May 21, 2:12 PM CDT	Mesoscale Discussion	SPC	Adair, Anderson, Bell, Boyle, Breathitt, Casey and 36 more	63 min
May 21, 2:26 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Anderson, Bath, Bell, Bourbon, Boyd and 55 more	7 hr
May 21, 6:00 PM CDT	Mesoscale Discussion	SPC	Bath, Bell, Boyd, Breathitt, Carter, Clay and 22 more	60 min
May 21, 12:50 AM CDT	Severe Thunderstorm Watch	SPC	Dunklin, Pemiscot	3 hr
May 21, 2:42 PM CDT	Mesoscale Discussion	SPC	Dunklin, Pemiscot	63 min
May 21, 3:00 PM CDT	Tornado Watch	SPC	Dunklin, Pemiscot	7 hr

Nearby

Mesoscale Discussions in Indiana, 2013 Mesoscale Discussions in Kentucky, 2013 Mesoscale Discussions in Illinois, 2013 Every mesoscale discussion in 2013

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.