Alert archive / Arkansas / Mesoscale Discussions in 2017

Mesoscale Discussion 236

March 1, 20176 states

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2017, 2:09 AM CST for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 1, 2017, 2:09 AM CST (08:09 UTC)
Expired: Mar 1, 2017, 4:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 99 counties

Arkansas County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sevier 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, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Dunklin County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Perry County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO, DeSoto County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Little Rock radar (KLZK), 130 km from the middle of the area, began a volume at 08:09 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 52Mar 1, 3:05 AM CST

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 8.2 hours before the alert went out and 254 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: 1117 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 931 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 7:46 PM CST	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Craighead, Cross, Fulton and 14 more	119 min
Feb 28, 8:29 PM CST	Tornado Watch	SPC	Clay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more	12 hr
Feb 28, 9:04 PM CST	Tornado Watch	SPC	Benton, Carroll, Madison, Washington	7 hr
Feb 28, 10:46 PM CST	Mesoscale Discussion	SPC	Boone, Carroll, Conway, Crawford, Franklin, Garland and 20 more	119 min
Feb 28, 11:35 PM CST	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 24 more	5 hr
Mar 1, 3:03 AM CST	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	5 hr
Mar 1, 4:19 AM CST	Mesoscale Discussion	SPC	Crittenden	56 min
Feb 28, 8:06 PM CST	Mesoscale Discussion	SPC	Adams, Brown, Bureau, Cass, Champaign, Christian and 37 more	84 min
Feb 28, 9:51 PM CST	Tornado Watch	SPC	Cass, Champaign, Christian, Clark, Clay, Coles and 37 more	6 hr
Feb 28, 10:09 PM CST	Mesoscale Discussion	SPC	Edwards, Franklin, Gallatin, Hamilton, Jackson, Johnson and 5 more	66 min
Feb 28, 11:52 PM CST	Mesoscale Discussion	SPC	Champaign, Ford, Iroquois, Vermilion	53 min
Feb 28, 10:03 PM CST	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Gallatin, Kenton, Pendleton	117 min
Feb 28, 10:29 PM CST	Tornado Watch	SPC	Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more	8 hr
Mar 1, 1:32 AM CST	Mesoscale Discussion	SPC	Adair, Anderson, Bath, Boone, Bourbon, Boyd and 69 more	88 min
Mar 1, 4:57 AM CST	Tornado Watch	SPC	Adair, Allen, Anderson, Barren, Boone, Bourbon and 55 more	5 hr
Mar 1, 5:28 AM CST	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 88 more	2 hr
Mar 1, 5:48 AM CST	Severe Thunderstorm Watch	SPC	Boyd, Carter, Greenup	5 hr
Mar 1, 6:47 AM CST	Severe Thunderstorm Watch	SPC	Bath, Bell, Breathitt, Clay, Elliott, Estill and 28 more	5 hr
Mar 1, 7:28 AM CST	Mesoscale Discussion	SPC	Bell, Boyd, Breathitt, Carter, Clay, Clinton and 32 more	92 min
Mar 1, 2:56 PM CST	Mesoscale Discussion	SPC	Boyd, Breathitt, Carter, Elliott, Floyd, Greenup and 8 more	2 hr
Mar 1, 10:08 AM CST	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 38 more	2 hr
Mar 1, 11:48 AM CST	Tornado Watch	SPC	Attala, Calhoun, Carroll, Chickasaw, Choctaw, Clay and 19 more	6 hr
Mar 1, 1:32 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Clarke, Copiah, Covington, Franklin and 14 more	2 hr
Mar 1, 2:11 PM CST	Mesoscale Discussion	SPC	Kemper, Leake, Lowndes, Neshoba, Noxubee, Winston	2 hr
Mar 1, 5:54 PM CST	Mesoscale Discussion	SPC	Clarke, Jones, Wayne	2 hr
Feb 28, 6:05 PM CST	Mesoscale Discussion	SPC	Adair, Audrain, Barton, Bates, Benton, Boone and 39 more	115 min
Feb 28, 6:23 PM CST	Tornado Watch	SPC	Adair, Bates, Carroll, Cass, Chariton, Cooper and 15 more	5 hr
Feb 28, 10:01 PM CST	Mesoscale Discussion	SPC	Barry, Barton, Bates, Benton, Camden, Cedar and 14 more	119 min
Mar 1, 12:16 AM CST	Mesoscale Discussion	SPC	Barton, Camden, Cedar, Christian, Cole, Crawford and 28 more	89 min

Nearby

Mesoscale Discussions in Arkansas, 2017 Mesoscale Discussions in Missouri, 2017 Mesoscale Discussions in Illinois, 2017 Every mesoscale discussion in 2017

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.