Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 614

April 10, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2008, 3:00 AM CDT for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2008, 3:00 AM CDT (08:00 UTC)
Expired: Apr 10, 2008, 4:00 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 29 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, McCracken County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Carroll County, TN, Crockett County, TN, Dyer County, TN, Gibson County, TN, Haywood County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 90 km from the middle of the area, began a volume at 08:02 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 186Apr 10, 3:25 AM CDT

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 8.0 hours before the alert went out and 148 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: 168 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 627 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 324 m²/s²
0-3 km storm-relative helicity: 404 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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
Apr 9, 7:28 PM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Hempstead, Howard, Johnson, Little River and 8 more	62 min
Apr 9, 8:10 PM CDT	Tornado Watch	SPC	Hempstead, Howard, Johnson, Little River, Logan, Montgomery and 6 more	6 hr
Apr 9, 10:40 PM CDT	Tornado Watch	SPC	Crawford, Franklin, Sebastian	7 hr
Apr 10, 1:45 AM CDT	Tornado Watch	SPC	Baxter, Boone, Cleburne, Conway, Faulkner, Fulton and 16 more	8 hr
Apr 10, 3:28 AM CDT	Tornado Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 4 more	7 hr
Apr 10, 3:54 AM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Hempstead, Howard and 10 more	8 hr
Apr 10, 5:55 AM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Howard, Johnson, Little River, Logan and 4 more	65 min
Apr 10, 8:32 AM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 22 more	58 min
Apr 10, 8:42 AM CDT	Tornado Watch	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more	7 hr
Apr 10, 9:27 AM CDT	Mesoscale Discussion	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 16 more	2 hr
Apr 10, 9:51 AM CDT	Tornado Watch	SPC	Clay, Cleburne, Conway, Craighead, Crittenden, Cross and 19 more	7 hr
Apr 10, 10:51 AM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 28 more	84 min
Apr 10, 1:41 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Clay, Cleveland and 20 more	2 hr
Apr 10, 5:03 PM CDT	Tornado Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more	6 hr
Apr 10, 6:56 AM CDT	Mesoscale Discussion	SPC	Christian, Douglas, Greene, Howell, Laclede, Maries and 9 more	64 min
Apr 10, 7:44 AM CDT	Tornado Watch	SPC	Dent, Douglas, Howell, Oregon, Ozark, Shannon and 2 more	2 hr
Apr 10, 11:16 AM CDT	Mesoscale Discussion	SPC	Cape Girardeau	2 hr
Apr 10, 2:03 PM CDT	Mesoscale Discussion	SPC	Andrew, Barton, Bates, Benton, Buchanan, Caldwell and 21 more	117 min
Apr 10, 2:28 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Andrew, Atchison, Barton, Bates, Benton and 51 more	7 hr
Apr 10, 4:55 PM CDT	Tornado Watch	SPC	Adair, Audrain, Clark, Gentry, Grundy, Harrison and 15 more	5 hr
Apr 10, 6:44 PM CDT	Mesoscale Discussion	SPC	Adair, Andrew, Atchison, Audrain, Barton, Bates and 59 more	61 min

Nearby

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