Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 815

June 4, 201420 counties in Arkansas; 16 counties in Missouri; 8 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 12:54 PM CDT for 20 counties in Arkansas; 16 counties in Missouri; 8 counties in Tennessee. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 4, 2014, 12:54 PM CDT (17:54 UTC)
Expired: Jun 4, 2014, 3:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 44 counties

Baxter County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, White County, AR, Woodruff County, AR, Bollinger County, MO, Butler County, MO, Carter County, MO, Dent County, MO, Dunklin County, MO, Howell County, MO, Madison County, MO, New Madrid County, MO, Oregon County, MO, Ozark County, MO, Pemiscot County, MO, Reynolds County, MO, Ripley County, MO, Shannon County, MO, Stoddard County, MO, Wayne County, MO, 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), 143 km from the middle of the area, began a volume at 17:53 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 219Jun 4, 2:25 PM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.9 hours before the alert went out and 272 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: 1030 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.7

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
Jun 3, 7:04 PM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, DeKalb, Gentry, Harrison, Holt and 2 more	56 min
Jun 3, 8:05 PM CDT	Mesoscale Discussion	SPC	Audrain, Clark, Knox, Lewis, Lincoln, Marion and 5 more	85 min
Jun 3, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Knox, Lewis, Marion, Monroe, Pike, Ralls and 1 more	5 hr
Jun 3, 9:41 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Buchanan, Caldwell, Chariton and 16 more	64 min
Jun 3, 11:30 PM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Caldwell, Callaway, Carroll, Cass and 23 more	60 min
Jun 3, 11:45 PM CDT	Severe Thunderstorm Watch	SPC	Audrain, Benton, Boone, Callaway, Carroll, Cass and 25 more	5 hr
Jun 4, 12:28 AM CDT	Mesoscale Discussion	SPC	Andrew, Atchison, Buchanan, Holt, Nodaway, Platte	62 min
Jun 4, 12:50 AM CDT	Severe Thunderstorm Watch	SPC	Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more	3 hr
Jun 4, 1:29 AM CDT	Mesoscale Discussion	SPC	Audrain, Boone, Callaway, Chariton, Cole, Cooper and 20 more	91 min
Jun 4, 3:32 AM CDT	Mesoscale Discussion	SPC	Benton, Camden, Cole, Cooper, Henry, Johnson and 5 more	88 min
Jun 4, 5:00 AM CDT	Severe Thunderstorm Watch	SPC	Callaway, Camden, Cole, Crawford, Dent, Franklin and 19 more	4 hr
Jun 4, 7:01 AM CDT	Mesoscale Discussion	SPC	Iron, Jefferson, Sainte Genevieve, Saint Francois, City of Saint Louis	89 min
Jun 4, 12:20 PM CDT	Mesoscale Discussion	SPC	Cape Girardeau, Crawford, Jefferson, Perry, Sainte Genevieve, Saint Francois and 1 more	115 min
Jun 4, 2:21 PM CDT	Tornado Watch	SPC	Bollinger, Butler, Cape Girardeau, Carter, Crawford, Iron and 13 more	6 hr
Jun 4, 3:47 PM CDT	Mesoscale Discussion	SPC	Barry, Camden, Cedar, Christian, Dade, Dallas and 14 more	118 min
Jun 4, 6:57 PM CDT	Mesoscale Discussion	SPC	Dunklin, Mississippi, New Madrid, Pemiscot, Scott, Stoddard	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2014 Mesoscale Discussions in Missouri, 2014 Mesoscale Discussions in Tennessee, 2014 Every mesoscale discussion in 2014

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.