Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 874

May 10, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 10, 2008, 9:21 PM CDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 10, 2008, 9:21 PM CDT (02:21 UTC)
Expired: May 10, 2008, 10:45 PM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 57 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL, Craighead County, AR, Crittenden County, AR, Mississippi County, AR, Poinsett County, AR, Alcorn County, MS, Benton County, MS, Chickasaw County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Chester County, TN, Decatur County, TN, Fayette County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, McNairy County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN

The radar

The Columbus AFB radar (KGWX), 106 km from the middle of the area, began a volume at 02:24 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, 2.4 hours before the alert went out and 119 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, 7:08 PM CDT	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 23 more	7 hr
May 10, 11:32 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 15 more	118 min
May 11, 1:06 AM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 32 more	84 min
May 11, 1:37 AM CDT	Tornado Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	7 hr
May 11, 3:40 AM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Bullock, Chambers, Chilton and 14 more	95 min
May 11, 4:52 AM CDT	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	8 hr
May 11, 6:24 AM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Clay, Coosa, Dale and 9 more	96 min
May 11, 7:51 AM CDT	Mesoscale Discussion	SPC	Barbour, Chambers, Dale, Henry, Houston, Lee and 1 more	84 min
May 10, 7:36 PM CDT	Mesoscale Discussion	SPC	Arkansas, Crittenden, Lee, Monroe, Phillips	54 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, 9:06 PM CDT	Tornado Watch	SPC	Bradley, Hamilton, Marion, Sequatchie	7 hr
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 Alabama, 2008 Mesoscale Discussions in Tennessee, 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.