Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 819

May 8, 20089 counties in Alabama; 27 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 8, 2008, 7:48 AM CDT for 9 counties in Alabama; 27 counties in Mississippi. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 8, 2008, 7:48 AM CDT (12:48 UTC)
Expired: May 8, 2008, 9:15 AM CDT
In force: 87 min
Issued by: the Storm Prediction Center

All 36 counties

Colbert County, AL, Fayette County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Marion County, AL, Pickens County, AL, Walker County, AL, Winston County, AL, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tallahatchie County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 34 km from the middle of the area, began a volume at 12:51 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 277May 8, 8:05 AM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 0.8 hours before the alert went out and 160 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: 3 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 8, 8:04 AM CDT	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more	6 hr
May 8, 10:07 AM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 33 more	83 min
May 8, 12:13 PM CDT	Mesoscale Discussion	SPC	Bibb, Fayette, Greene, Hale, Jefferson, Perry and 4 more	92 min
May 8, 12:37 PM CDT	Mesoscale Discussion	SPC	Blount, Cherokee, Cullman, DeKalb, Etowah, Jackson and 7 more	83 min
May 8, 12:40 PM CDT	Tornado Watch	SPC	Bibb, Blount, Calhoun, Cherokee, Chilton, Choctaw and 29 more	5 hr
May 8, 3:13 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 17 more	2 hr
May 7, 10:28 PM CDT	Mesoscale Discussion	SPC	Adams	92 min
May 7, 11:49 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Covington, Franklin and 25 more	116 min

Nearby

Mesoscale Discussions in Mississippi, 2008 Mesoscale Discussions in Alabama, 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.