Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 917

May 20, 20069 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2006, 11:32 PM CDT for 9 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
May 20, 2006, 11:32 PM CDT (04:32 UTC)
Expired
May 21, 2006, 1:00 AM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 129 counties

Colbert County, AL, DeKalb County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Mississippi County, AR, Banks County, GA, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Dawson County, GA, Elbert County, GA, Fannin County, GA, Floyd County, GA, Forsyth County, GA, Franklin County, GA, Gilmer County, GA, Gordon County, GA, Habersham County, GA, Hall County, GA, Hart County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Murray County, GA, Pickens County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, Walker County, GA, White County, GA, Whitfield County, GA, Fulton County, KY, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Tishomingo County, MS, Bladen County, NC, Cherokee County, NC, Clay County, NC, Columbus County, NC, Graham County, NC, Macon County, NC, Robeson County, NC, Scotland County, NC, Abbeville County, SC, Anderson County, SC, Chester County, SC, Chesterfield County, SC, Clarendon County, SC, Darlington County, SC, Dillon County, SC, Fairfield County, SC, Florence County, SC, Greenville County, SC, Greenwood County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Laurens County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, McCormick County, SC, Newberry County, SC, Oconee County, SC, Pickens County, SC, Richland County, SC, Saluda County, SC, Spartanburg County, SC, Sumter County, SC, Union County, SC, Williamsburg County, SC, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Bradley County, TN, Carroll County, TN, Chester County, TN, Coffee County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Franklin County, TN, Gibson County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, McNairy County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN, Tipton County, TN, Warren County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The radar

The Northeast Alabama radar (KHTX), 154 km from the middle of the area, began a volume at 04:32 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.5 hours before the alert went out and 169 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, Peachtre/Fal Fld, GA at 00:00Z on 2006-05-21Temperature 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, Peachtre/Fal Fld, GA at 00:00Z on 2006-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 square meters per square second.193958Sfc1 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
2905 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
277 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
May 20, 7:47 PM CDTMesoscale DiscussionSPCDeKalb, Jackson, Madison28 min
May 20, 8:04 PM CDTSevere Thunderstorm WatchSPCDeKalb, Jackson, Limestone, Madison, Marshall9 hr
May 20, 9:28 PM CDTMesoscale DiscussionSPCColbert, Lauderdale, Lawrence, Limestone62 min
May 21, 3:12 PM CDTMesoscale DiscussionSPCJackson, Lauderdale, Limestone, Madison93 min
May 21, 3:35 PM CDTSevere Thunderstorm WatchSPCDeKalb, Jackson, Lauderdale, Limestone, Madison6 hr
May 20, 11:53 PM CDTMesoscale DiscussionSPCClay97 min
May 21, 2:49 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Fulton, Izard and 1 more116 min
May 21, 11:50 AM CDTMesoscale DiscussionSPCBanks, Elbert, Franklin, Hart, Stephens55 min
May 21, 12:22 PM CDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens5 hr
May 20, 8:35 PM CDTMesoscale DiscussionSPCBeaufort, Bladen, Brunswick, Carteret, Chatham, Columbus and 22 more55 min
May 21, 2:39 PM CDTMesoscale DiscussionSPCAnson, Bladen, Brunswick, Columbus, New Hanover, Pender and 4 more66 min
May 21, 3:06 PM CDTSevere Thunderstorm WatchSPCAnson, Bladen, Brunswick, Columbus, New Hanover, Pender and 3 more3 hr
May 21, 4:46 PM CDTMesoscale DiscussionSPCBladen, Brunswick, Columbus, New Hanover, Pender, Richmond and 2 more89 min

Nearby

Mesoscale Discussions in Tennessee, 2006Mesoscale Discussions in Georgia, 2006Mesoscale Discussions in South Carolina, 2006Every mesoscale discussion in 2006

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.