Alert archive / Illinois / Mesoscale Discussions in 2015

Mesoscale Discussion 2035

December 23, 20155 states

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2015, 10:29 AM CST for 5 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Dec 23, 2015, 10:29 AM CST (16:29 UTC)
Expired: Dec 23, 2015, 12:00 PM CST
In force: 91 min
Issued by: the Storm Prediction Center

All 47 counties

Clay County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 76 km from the middle of the area, began a volume at 16:29 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.

Tornado Watch 560Dec 23, 12:25 PM CST

The nearest sounding before it

Little Rock, AR (KBYH), launched 12:00Z, 4.5 hours before the alert went out and 281 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: 343 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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
Dec 22, 10:17 PM CST	Mesoscale Discussion	SPC	Clark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 9 more	2 hr
Dec 23, 12:06 AM CST	Tornado Watch	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	7 hr
Dec 23, 4:39 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 37 more	2 hr
Dec 23, 6:13 AM CST	Mesoscale Discussion	SPC	Clay, Greene, Randolph	2 hr
Dec 23, 6:20 AM CST	Tornado Watch	SPC	Arkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more	7 hr
Dec 23, 9:05 AM CST	Mesoscale Discussion	SPC	Arkansas, Clark, Clay, Cleburne, Cleveland, Craighead and 28 more	85 min
Dec 23, 9:13 AM CST	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	8 hr
Dec 23, 10:12 AM CST	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more	93 min
Dec 23, 10:58 AM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Chicot, Cleveland, Crittenden and 11 more	2 hr
Dec 23, 11:57 AM CST	Tornado Watch PDS	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 12 more	9 hr
Dec 23, 12:48 PM CST	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 16 more	57 min
Dec 23, 2:49 PM CST	Mesoscale Discussion	SPC	Chicot, Crittenden, Cross, Desha, Lee, Mississippi and 2 more	86 min
Dec 23, 9:41 AM CST	Mesoscale Discussion	SPC	Cook, DuPage, Ford, Grundy, Iroquois, Kane and 5 more	2 hr
Dec 23, 12:06 PM CST	Mesoscale Discussion	SPC	Clay, Crawford, Edwards, Gallatin, Hamilton, Hardin and 7 more	84 min
Dec 23, 12:42 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Cass, Fulton and 25 more	2 hr
Dec 23, 1:55 PM CST	Tornado Watch	SPC	Adams, Brown, Bureau, Calhoun, Cass, Fulton and 24 more	4 hr
Dec 23, 3:24 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Calhoun, Cass, Fulton and 26 more	96 min
Dec 23, 12:28 PM CST	Tornado Watch	SPC	Bartholomew, Boone, Brown, Carroll, Clark, Clay and 51 more	8 hr
Dec 23, 1:55 PM CST	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Huntington, Kosciusko, LaGrange and 4 more	95 min
Dec 23, 2:16 PM CST	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 34 more	59 min
Dec 23, 4:59 PM CST	Mesoscale Discussion	SPC	Clark, Crawford, Dubois, Floyd, Harrison, Orange and 4 more	2 hr
Dec 23, 3:17 PM CST	Severe Thunderstorm Watch	SPC	Boone, Bracken, Campbell, Gallatin, Grant, Kenton and 5 more	7 hr

Nearby

Mesoscale Discussions in Illinois, 2015 Mesoscale Discussions in Missouri, 2015 Mesoscale Discussions in Kentucky, 2015 Every mesoscale discussion in 2015

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.