Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 35

January 8, 200819 counties in Alabama; 5 counties in Kentucky; 26 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jan 8, 2008, 5:51 PM CST for 19 counties in Alabama; 5 counties in Kentucky; 26 counties in Tennessee. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued
Jan 8, 2008, 5:51 PM CST (23:51 UTC)
Expired
Jan 8, 2008, 6:45 PM CST
In force
54 min
Issued by
the Storm Prediction Center
All 50 counties

Blount County, AL, Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Jackson 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, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Allen County, KY, Clinton County, KY, Cumberland County, KY, Metcalfe County, KY, Monroe County, KY, Bedford County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Jackson County, TN, Lawrence County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Overton County, TN, Putnam County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 46 km from the middle of the area, began a volume at 23:53 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.9 hours before the alert went out and 107 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2008-01-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2008-01-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 426 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
426 m²/s²
0-3 km storm-relative helicity
368 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.

IssuedProductOfficeCountiesLasted
Jan 8, 4:03 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lauderdale117 min
Jan 8, 8:34 AM CSTTornado WatchSPCBallard, Calloway, Carlisle, Fulton, Graves, Hickman and 2 more5 hr
Jan 8, 11:27 AM CSTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 11 more2 hr
Jan 8, 12:22 PM CSTMesoscale DiscussionSPCBallard, Breckinridge, Bullitt, Butler, Caldwell, Carroll and 26 more83 min
Jan 8, 1:11 PM CSTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 18 more2 hr
Jan 8, 1:26 PM CSTTornado WatchSPCBallard, Breckinridge, Bullitt, Butler, Caldwell, Calloway and 37 more8 hr

Nearby

Mesoscale Discussions in Tennessee, 2008Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Kentucky, 2008Every 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.