Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 1896

August 7, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Aug 7, 2011, 10:54 PM CDT for 5 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Aug 7, 2011, 10:54 PM CDT (03:54 UTC)
Expired: Aug 8, 2011, 12:30 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 55 counties

Clay County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Izard County, AR, Lawrence County, AR, Mississippi County, AR, Randolph County, AR, Sharp County, AR, Alexander County, IL, Massac County, IL, Pulaski County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Bollinger County, MO, Butler County, MO, Carter County, MO, Dunklin County, MO, Howell County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO, Benton County, TN, Carroll County, TN, Crockett County, TN, Dyer County, TN, Gibson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Montgomery County, TN, Obion County, TN, Stewart County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 115 km from the middle of the area, began a volume at 03:54 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, 3.9 hours before the alert went out and 173 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: 1065 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 2091 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Aug 7, 8:27 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clay, Craighead, Fulton and 10 more	2 hr
Aug 7, 9:18 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Greene, Mississippi, Randolph	4 hr
Aug 8, 2:04 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleburne, Conway, Crawford, Cross and 29 more	86 min
Aug 8, 1:06 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Grundy, Henderson and 19 more	84 min
Aug 8, 5:23 PM CDT	Mesoscale Discussion	SPC	Bureau, Cass, Champaign, Christian, DeWitt, Ford and 21 more	67 min
Aug 8, 5:38 PM CDT	Severe Thunderstorm Watch	SPC	Bureau, Champaign, DeWitt, Ford, Fulton, Grundy and 19 more	5 hr
Aug 8, 5:00 PM CDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Gallatin, Grant, Kenton and 3 more	2 hr
Aug 8, 12:46 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Cass, Cedar, Dade and 7 more	59 min
Aug 8, 1:09 AM CDT	Severe Thunderstorm Watch	SPC	Barton, Bates, Benton, Camden, Cedar, Christian and 13 more	3 hr

Nearby

Mesoscale Discussions in Kentucky, 2011 Mesoscale Discussions in Missouri, 2011 Mesoscale Discussions in Tennessee, 2011 Every mesoscale discussion in 2011

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.