Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 900

May 23, 20116 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 3:58 PM CDT for 6 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 3:58 PM CDT (20:58 UTC)
Expired: May 23, 2011, 5:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 83 counties

Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Mississippi County, AR, Newton County, AR, Poinsett County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff 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, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, Crockett County, TN, Dyer County, TN, Fayette County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 130 km from the middle of the area, began a volume at 21:01 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.

Severe Thunderstorm Watch 347May 23, 5:00 PM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.0 hours before the alert went out and 184 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: 2279 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 10.2

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 22, 7:52 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 13 more	53 min
May 22, 8:47 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Clay, Cleburne and 34 more	7 hr
May 22, 11:46 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Crawford, Cross and 23 more	89 min
May 23, 5:07 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Fulton and 10 more	113 min
May 23, 7:38 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll	97 min
May 23, 9:14 AM CDT	Mesoscale Discussion	SPC	Clark, Cleburne, Conway, Crawford, Dallas, Faulkner and 26 more	91 min
May 23, 9:57 AM CDT	Mesoscale Discussion	SPC	Lafayette, Little River, Miller	33 min
May 23, 10:34 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Fulton	86 min
May 23, 12:10 PM CDT	Mesoscale Discussion	SPC	Lafayette, Miller	65 min
May 23, 12:12 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Craighead and 13 more	93 min
May 23, 1:16 PM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Craighead, Fulton, Greene, Independence and 5 more	89 min
May 23, 1:34 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more	6 hr
May 23, 5:07 PM CDT	Mesoscale Discussion	SPC	Benton, Crawford, Washington	23 min
May 23, 5:24 PM CDT	Tornado Watch	SPC	Crawford, Franklin, Sebastian, Washington	4 hr
May 23, 6:18 PM CDT	Mesoscale Discussion	SPC	Cleburne, Craighead, Crittenden, Cross, Faulkner, Independence and 11 more	87 min
May 22, 8:26 PM CDT	Tornado Watch	SPC	Bond, Calhoun, Cass, Champaign, Christian, Clay and 35 more	8 hr
May 22, 9:35 PM CDT	Mesoscale Discussion	SPC	DeKalb, DuPage, Grundy, Iroquois, Kane, Kankakee and 6 more	55 min
May 22, 10:24 PM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 9 more	66 min
May 23, 7:25 AM CDT	Mesoscale Discussion	SPC	Edgar, Vermilion	65 min
May 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Alexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more	7 hr
May 23, 12:37 PM CDT	Mesoscale Discussion	SPC	Bond, Christian, Clark, Clay, Clinton, Coles and 34 more	83 min
May 23, 12:54 PM CDT	Severe Thunderstorm Watch	SPC	Champaign, Christian, Clark, Clay, Coles, Crawford and 13 more	5 hr
May 23, 2:52 PM CDT	Mesoscale Discussion	SPC	Clark, Clay, Coles, Crawford, Cumberland, Edgar and 8 more	53 min
May 23, 4:24 PM CDT	Mesoscale Discussion	SPC	Massac	96 min
May 22, 7:20 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 33 more	115 min
May 22, 9:59 PM CDT	Mesoscale Discussion	SPC	Allen, Carroll, Cass, DeKalb, Elkhart, Fulton and 14 more	61 min
May 23, 3:20 AM CDT	Mesoscale Discussion	SPC	Clark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more	85 min
May 23, 11:35 AM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more	85 min
May 23, 1:15 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 15 more	8 hr
May 23, 3:28 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more	6 hr
May 23, 5:20 PM CDT	Mesoscale Discussion	SPC	Clark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more	55 min
May 23, 5:40 PM CDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, DeKalb, Grant, Howard and 8 more	65 min
May 23, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Barren, Butler, Caldwell, Calloway, Christian and 23 more	4 hr
May 23, 6:20 PM CDT	Mesoscale Discussion	SPC	Bath, Boyd, Breathitt, Carter, Elliott, Estill and 19 more	85 min
May 23, 5:41 AM CDT	Mesoscale Discussion	SPC	Barton, Bates, Cedar, Dade, Hickory, Jasper and 5 more	94 min
May 23, 6:08 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Barton, Bates, Benton, Camden, Cass and 34 more	7 hr

Nearby

Mesoscale Discussions in Arkansas, 2011 Mesoscale Discussions in Illinois, 2011 Mesoscale Discussions in Missouri, 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.