Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 862

May 10, 200831 counties in Arkansas; 12 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 10, 2008, 2:23 PM CDT for 31 counties in Arkansas; 12 parishes in Louisiana; 16 counties in Mississippi. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 10, 2008, 2:23 PM CDT (19:23 UTC)
Expired: May 10, 2008, 4:00 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

All 59 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Union County, AR, Claiborne Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Little Rock radar (KLZK), 124 km from the middle of the area, began a volume at 19:26 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 296May 10, 3:35 PM CDT

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.4 hours before the alert went out and 197 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: 1370 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

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 10, 4:05 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Carroll, Clay, Cleburne, Craighead and 21 more	115 min
May 10, 7:36 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Franklin, Hempstead, Howard and 12 more	2 hr
May 10, 9:40 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 37 more	65 min
May 10, 10:11 AM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 29 more	5 hr
May 10, 10:55 AM CDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 7 more	2 hr
May 10, 11:29 AM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Conway, Crawford and 15 more	9 hr
May 10, 12:34 PM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Fulton, Greene, Independence, Lawrence and 4 more	116 min
May 10, 3:36 PM CDT	Tornado Watch PDS	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 36 more	4 hr
May 10, 4:27 PM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more	10 hr
May 10, 5:13 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 9 more	2 hr
May 10, 6:22 PM CDT	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Chicot, Clark, Cleveland and 28 more	83 min
May 10, 6:51 PM CDT	Tornado Watch PDS	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 50 more	7 hr
May 9, 11:08 PM CDT	Mesoscale Discussion	SPC	Alcorn, Calhoun, Chickasaw, Choctaw, Clay, Itawamba and 13 more	2 hr
May 10, 2:28 PM CDT	Mesoscale Discussion	SPC	Choctaw, Clay, Lowndes, Monroe, Noxubee, Oktibbeha and 2 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Louisiana, 2008 Every mesoscale discussion in 2008

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.