Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 418

March 15, 20086 states

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2008, 10:23 AM CDT for 6 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Mar 15, 2008, 10:23 AM CDT (15:23 UTC)
Expired
Mar 15, 2008, 11:30 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 52 counties

Colbert County, AL, Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lee County, AR, Mississippi County, AR, Poinsett County, AR, St. Francis County, AR, Woodruff County, AR, Fulton County, KY, Graves County, KY, Hickman County, KY, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Prentiss County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Perry County, TN, Shelby County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 40 km from the middle of the area, began a volume at 15:23 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 12:00Z, 3.4 hours before the alert went out and 47 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, Little Rock, AR at 12:00Z on 2008-03-15Temperature 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, Little Rock, AR at 12:00Z on 2008-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.1939587897117Sfc1 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
582 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
54 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
Mar 14, 7:11 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Blount, Bullock, Calhoun, Chambers and 18 more64 min
Mar 15, 12:39 AM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 22 more66 min
Mar 15, 12:56 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 38 more6 hr
Mar 15, 2:57 AM CDTMesoscale DiscussionSPCCherokee, Cleburne, Randolph93 min
Mar 15, 4:30 AM CDTMesoscale DiscussionSPCColbert, Franklin, Marion90 min
Mar 15, 6:58 AM CDTMesoscale DiscussionSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 11 more62 min
Mar 15, 7:02 AM CDTSevere Thunderstorm WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more4 hr
Mar 15, 9:38 AM CDTMesoscale DiscussionSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Randolph and 1 more67 min
Mar 15, 10:02 AM CDTTornado WatchSPCAutauga, Bullock, Calhoun, Chambers, Cherokee, Chilton and 15 more8 hr
Mar 15, 12:22 PM CDTMesoscale DiscussionSPCBullock, Calhoun, Chambers, Clay, Cleburne, Coosa and 8 more83 min
Mar 15, 1:21 PM CDTMesoscale DiscussionSPCCalhoun, Chambers, Clay, Cleburne, Randolph84 min
Mar 15, 2:08 PM CDTMesoscale DiscussionSPCCleburne67 min
Mar 15, 2:39 PM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Fayette, Franklin and 12 more2 hr
Mar 14, 7:14 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more7 hr
Mar 14, 8:01 PM CDTMesoscale DiscussionSPCBenton, Washington29 min
Mar 14, 8:17 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more5 hr
Mar 14, 9:50 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 23 more55 min
Mar 14, 10:47 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more28 min
Mar 14, 11:24 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 32 more7 hr
Mar 14, 11:55 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 15 more65 min
Mar 14, 11:55 PM CDTSevere Thunderstorm WatchSPCCrittenden, Mississippi7 hr
Mar 15, 2:12 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Cleburne, Conway, Craighead, Crittenden and 26 more93 min
Mar 14, 10:36 PM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 24 more84 min
Mar 14, 11:01 PM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 27 more3 hr
Mar 15, 1:47 AM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Clarke, Clay, Copiah and 25 more88 min

Nearby

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