Alert archive / Tennessee / Mesoscale Discussions in 2010

Mesoscale Discussion 2004

October 26, 20109 counties in Alabama; Dade County, Georgia; 37 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 26, 2010, 11:57 AM CDT for 9 counties in Alabama; Dade County, Georgia; 37 counties in Tennessee. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Oct 26, 2010, 11:57 AM CDT (16:57 UTC)
Expired
Oct 26, 2010, 1:30 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 47 counties

DeKalb County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Winston County, AL, Dade County, GA, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 43 km from the middle of the area, began a volume at 16:59 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, 5.0 hours before the alert went out and 112 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 2010-10-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 324 joules per kilogram.LCLLFCEL10008507005003002001001 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 2010-10-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 403 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
324 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
796 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
403 m²/s²
0-3 km storm-relative helicity
486 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.4

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
Oct 26, 6:00 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Lawrence, Limestone2 hr
Oct 26, 8:54 AM CDTMesoscale DiscussionSPCColbert, Cullman, Franklin, Jackson, Lauderdale, Lawrence and 7 more66 min
Oct 26, 9:27 AM CDTTornado Watch PDSSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 12 more11 hr
Oct 26, 2:59 PM CDTTornado WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 25 more5 hr
Oct 26, 3:44 PM CDTMesoscale DiscussionSPCDeKalb, Jackson, Lawrence, Madison, Morgan61 min
Oct 26, 6:32 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 18 more58 min
Oct 26, 1:16 PM CDTTornado WatchSPCBanks, Bartow, Carroll, Catoosa, Chattooga, Cherokee and 30 more8 hr
Oct 26, 3:51 PM CDTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Clayton, Cobb, Coweta and 7 more54 min
Oct 26, 6:19 PM CDTTornado WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens12 hr
Oct 26, 3:38 AM CDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 19 more2 hr
Oct 26, 4:05 AM CDTTornado WatchSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 20 more8 hr

Nearby

Mesoscale Discussions in Tennessee, 2010Mesoscale Discussions in Alabama, 2010Mesoscale Discussions in Georgia, 2010Every mesoscale discussion in 2010

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.