Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 2017

November 17, 201310 counties in Illinois; Ballard County, Carlisle County, Kentucky; 5 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2013, 1:05 PM CST for 10 counties in Illinois; Ballard County, Carlisle County, Kentucky; 5 counties in Missouri. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Nov 17, 2013, 1:05 PM CST (19:05 UTC)
Expired: Nov 17, 2013, 2:00 PM CST
In force: 55 min
Issued by: the Storm Prediction Center

Counties Alexander County, IL, Hamilton County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wayne County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Butler County, MO, Mississippi County, MO, New Madrid County, MO, Scott County, MO, Stoddard County, MO

The radar

The Paducah radar (KPAH), 56 km from the middle of the area, began a volume at 19:05 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

Little Rock, AR (KBYH), launched 12:00Z, 7.1 hours before the alert went out and 266 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: 874 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 7.1

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
Nov 16, 11:29 PM CST	Mesoscale Discussion	SPC	Alexander, Jackson, Johnson, Pulaski, Union, Williamson	61 min
Nov 17, 2:06 AM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more	84 min
Nov 17, 7:47 AM CST	Mesoscale Discussion	SPC	Adams, Bond, Brown, Bureau, Calhoun, Carroll and 55 more	88 min
Nov 17, 8:40 AM CST	Tornado Watch PDS	SPC	Adams, Bond, Boone, Brown, Bureau, Calhoun and 77 more	7 hr
Nov 17, 10:17 AM CST	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more	118 min
Nov 17, 10:43 AM CST	Tornado Watch	SPC	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	8 hr
Nov 17, 10:49 AM CST	Mesoscale Discussion	SPC	Bond, Boone, Bureau, Calhoun, Cass, Champaign and 56 more	86 min
Nov 17, 11:57 AM CST	Mesoscale Discussion	SPC	Champaign, Coles, Cook, DeWitt, Douglas, DuPage and 11 more	93 min
Nov 17, 11:57 AM CST	Mesoscale Discussion	SPC	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more	93 min
Nov 17, 1:13 PM CST	Mesoscale Discussion	SPC	Clark, Crawford, Edgar, Edwards, Jasper, Lawrence and 3 more	77 min
Nov 17, 2:43 PM CST	Mesoscale Discussion	SPC	Alexander, Edwards, Gallatin, Hamilton, Hardin, Johnson and 8 more	62 min
Nov 17, 10:20 AM CST	Tornado Watch PDS	SPC	Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 3 more	9 hr
Nov 17, 1:34 PM CST	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 46 more	56 min
Nov 17, 1:58 PM CST	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more	6 hr
Nov 17, 3:25 PM CST	Tornado Watch	SPC	Greenup, Lewis, Mason, Robertson	5 hr
Nov 17, 3:46 PM CST	Mesoscale Discussion	SPC	Barren, Breckinridge, Bullitt, Butler, Caldwell, Calloway and 37 more	89 min
Nov 17, 5:06 PM CST	Mesoscale Discussion	SPC	Bracken, Campbell, Kenton, Mason	54 min
Nov 17, 5:16 PM CST	Mesoscale Discussion	SPC	Adair, Bath, Boyd, Breathitt, Carter, Casey and 40 more	59 min
Nov 16, 7:53 PM CST	Mesoscale Discussion	SPC	Adair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 16 more	67 min

Nearby

Mesoscale Discussions in Illinois, 2013 Mesoscale Discussions in Missouri, 2013 Mesoscale Discussions in Kentucky, 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.