Alert archive / Tennessee / Mesoscale Discussions in 2008

Mesoscale Discussion 627

April 10, 20087 states

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2008, 7:48 PM CDT for 7 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 10, 2008, 7:48 PM CDT (00:48 UTC)
Expired
Apr 10, 2008, 8:45 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 109 counties

Crittenden County, AR, Mississippi County, AR, Phillips County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Dubois County, IN, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Hancock County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Lafayette County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 94 km from the middle of the area, began a volume at 00:51 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 0.8 hours before the alert went out and 141 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 00:00Z on 2008-04-11Temperature 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 00:00Z on 2008-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
2603 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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.

IssuedProductOfficeCountiesLasted
Apr 10, 8:22 PM CDTSevere Thunderstorm WatchSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more5 hr
Apr 10, 9:54 PM CDTMesoscale DiscussionSPCDesha66 min
Apr 10, 11:34 PM CDTMesoscale DiscussionSPCCrittenden, Cross, Lee, Mississippi, Phillips, St. Francis56 min
Apr 11, 10:47 AM CDTMesoscale DiscussionSPCAdams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more88 min
Apr 11, 11:26 AM CDTMesoscale DiscussionSPCClark, Dearborn, Decatur, Fayette, Floyd, Franklin and 9 more2 hr
Apr 11, 11:58 AM CDTTornado WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more8 hr
Apr 11, 1:41 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, DeKalb and 14 more94 min
Apr 11, 5:01 PM CDTMesoscale DiscussionSPCRandolph, Wayne89 min
Apr 11, 2:15 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 56 more2 hr
Apr 11, 12:30 PM CDTTornado WatchSPCAdair, Bell, Boyle, Breathitt, Casey, Clay and 35 more5 hr
Apr 11, 1:15 PM CDTMesoscale DiscussionSPCBell, Clay, Clinton, Knox, Laurel, Leslie and 4 more2 hr
Apr 11, 3:53 PM CDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 19 more67 min
Apr 11, 7:59 AM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Benton, Bolivar, Calhoun and 61 more2 hr
Apr 11, 10:15 AM CDTTornado WatchSPCAdams, Alcorn, Attala, Calhoun, Carroll, Chickasaw and 44 more5 hr
Apr 11, 3:07 PM CDTSevere Thunderstorm WatchSPCClarke, Copiah, Covington, Forrest, Franklin, Greene and 18 more8 hr
Apr 11, 3:00 PM CDTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more5 hr
Apr 11, 5:34 PM CDTMesoscale DiscussionSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 25 more56 min

Nearby

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