Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 880

May 22, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 11:46 PM CDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: May 22, 2011, 11:46 PM CDT (04:46 UTC)
Expired: May 23, 2011, 1:15 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 35 counties

Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Cross County, AR, Faulkner County, AR, Franklin County, AR, Greene County, AR, Independence County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Madison County, AR, Mississippi County, AR, Newton County, AR, Perry County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Dunklin County, MO, Pemiscot County, MO, Haskell County, OK, Sequoyah County, OK, Dyer County, TN, Lake County, TN

The radar

The Little Rock radar (KLZK), 127 km from the middle of the area, began a volume at 04:48 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

Springfield, MO (KSGF), launched 00:00Z, 4.8 hours before the alert went out and 195 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: 3961 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 641 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 3.7
Supercell composite: 15.9

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
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 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, 3:58 PM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more	92 min
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	Barry, Bollinger, Butler, Cape Girardeau, Carter, Crawford and 33 more	8 hr
May 22, 10:24 PM CDT	Mesoscale Discussion	SPC	Bollinger, Butler, Cape Girardeau, Madison, Perry, Sainte Genevieve and 2 more	66 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
May 23, 10:55 AM CDT	Severe Thunderstorm Watch	SPC	Audrain, Bollinger, Boone, Butler, Callaway, Cape Girardeau and 28 more	7 hr
May 23, 12:37 PM CDT	Mesoscale Discussion	SPC	City of Saint Louis	83 min
May 22, 8:10 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more	65 min
May 23, 2:08 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more	97 min
May 23, 2:30 PM CDT	Tornado Watch	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more	8 hr
May 23, 6:51 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more	84 min
May 23, 3:20 AM CDT	Mesoscale Discussion	SPC	Clay, Davidson, Fentress, Jackson, Macon, Overton and 9 more	85 min
May 23, 4:24 PM CDT	Mesoscale Discussion	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 29 more	96 min
May 23, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 29 more	4 hr

Nearby

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