Alert archive / Illinois / Mesoscale Discussions in 2013

Mesoscale Discussion 438

April 10, 20137 states

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2013, 11:08 PM CDT for 7 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2013, 11:08 PM CDT (04:08 UTC)
Expired: Apr 11, 2013, 12:45 AM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 67 counties

Crittenden County, AR, Mississippi County, AR, Alexander County, IL, Clay County, IL, Crawford County, IL, Cumberland County, IL, Edwards County, IL, Effingham County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Daviess County, IN, Gibson County, IN, Knox County, IN, Pike County, IN, Posey County, IN, Vanderburgh County, IN, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton 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, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, DeSoto County, MS, Marshall County, MS, Panola County, MS, Tate County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 15 km from the middle of the area, began a volume at 04:10 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 (KLZK), launched 00:00Z, 4.1 hours before the alert went out and 280 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: 2188 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 918 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 362 m²/s²
0-3 km storm-relative helicity: 472 m²/s²
Significant tornado parameter: 5.8
Supercell composite: 29.7

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
Apr 10, 7:55 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more	95 min
Apr 10, 8:28 PM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more	7 hr
Apr 10, 9:14 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Drew	2 hr
Apr 10, 8:00 PM CDT	Mesoscale Discussion	SPC	Brown, Cass, Champaign, DeWitt, Douglas, Edgar and 17 more	2 hr
Apr 10, 11:51 PM CDT	Mesoscale Discussion	SPC	Adams, Blackford, Boone, Carroll, Cass, Clinton and 20 more	84 min
Apr 11, 6:26 PM CDT	Mesoscale Discussion	SPC	Boyd, Breathitt, Carter, Elliott, Floyd, Greenup and 10 more	94 min
Apr 11, 6:55 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Forrest and 28 more	65 min
Apr 11, 8:00 AM CDT	Tornado Watch	SPC	Amite, Clarke, Copiah, Covington, Forrest, George and 24 more	8 hr
Apr 11, 10:41 AM CDT	Mesoscale Discussion	SPC	Kemper, Lauderdale, Lowndes, Noxubee	2 hr
Apr 11, 12:53 PM CDT	Mesoscale Discussion	SPC	Forrest, George, Greene, Hancock, Harrison, Jackson and 4 more	82 min
Apr 11, 11:56 AM CDT	Tornado Watch	SPC	Franklin, Lincoln, Moore	7 hr
Apr 11, 12:34 PM CDT	Severe Thunderstorm Watch	SPC	Bedford, Cannon, Clay, Coffee, Cumberland, DeKalb and 17 more	6 hr
Apr 11, 2:21 PM CDT	Mesoscale Discussion	SPC	Lincoln	84 min
Apr 11, 2:59 PM CDT	Mesoscale Discussion	SPC	Bedford, Bledsoe, Cannon, Clay, Coffee, Cumberland and 26 more	91 min
Apr 11, 5:06 PM CDT	Mesoscale Discussion	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more	84 min
Apr 11, 5:36 PM CDT	Tornado Watch	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 30 more	7 hr

Nearby

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