Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 871

May 10, 20085 counties in Arkansas; 4 counties in Mississippi; 6 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 10, 2008, 7:36 PM CDT for 5 counties in Arkansas; 4 counties in Mississippi; 6 counties in Tennessee. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 10, 2008, 7:36 PM CDT (00:36 UTC)
Expired: May 10, 2008, 8:30 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Arkansas County, AR, Crittenden County, AR, Lee County, AR, Monroe County, AR, Phillips County, AR, DeSoto County, MS, Marshall County, MS, Tate County, MS, Tunica County, MS, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Madison County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 83 km from the middle of the area, began a volume at 00:37 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

Little Rock, AR (KLZK), launched 00:00Z, 0.6 hours before the alert went out and 57 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: 2977 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 589 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 426 m²/s²
Significant tornado parameter: 9.1
Supercell composite: 41.7

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
May 10, 9:21 PM CDT	Mesoscale Discussion	SPC	Craighead, Crittenden, Mississippi, Poinsett	84 min
May 10, 9:42 PM CDT	Mesoscale Discussion	SPC	Arkansas, Baxter, Cleburne, Cleveland, Conway, Dallas and 22 more	93 min
May 10, 10:07 PM CDT	Tornado Watch	SPC	Attala, Choctaw, Clay, Hinds, Issaquena, Kemper and 16 more	5 hr
May 11, 1:39 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Forrest and 15 more	96 min
May 10, 7:08 PM CDT	Tornado Watch	SPC	Bedford, Coffee, Franklin, Giles, Grundy, Hickman and 8 more	7 hr
May 10, 9:06 PM CDT	Tornado Watch	SPC	Bradley, Hamilton, Marion, Sequatchie	7 hr
May 10, 11:32 PM CDT	Mesoscale Discussion	SPC	Franklin, Giles, Lawrence, Lincoln, Moore	118 min
May 11, 8:34 AM CDT	Mesoscale Discussion	SPC	Blount, Carter, Claiborne, Cocke, Grainger, Greene and 11 more	26 min
May 11, 8:52 AM CDT	Tornado Watch	SPC	Anderson, Blount, Bradley, Campbell, Carter, Claiborne and 18 more	6 hr
May 11, 10:10 AM CDT	Mesoscale Discussion	SPC	Greene, Hawkins, Sullivan, Washington	95 min
May 11, 1:33 PM CDT	Mesoscale Discussion	SPC	Carter, Johnson	57 min

Nearby

Mesoscale Discussions in Tennessee, 2008 Mesoscale Discussions in Arkansas, 2008 Mesoscale Discussions in Mississippi, 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.