Alert archive / Tennessee / Mesoscale Discussions in 2006

Mesoscale Discussion 903

May 20, 20064 states

The Storm Prediction Center issued this mesoscale discussion at May 20, 2006, 3:57 AM EDT for 4 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 20, 2006, 3:57 AM EDT (07:57 UTC)
Expired: May 20, 2006, 5:00 AM EDT
In force: 63 min
Issued by: the Storm Prediction Center

All 49 counties

Rabun County, GA, Towns County, GA, Buncombe County, NC, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Polk County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Greenville County, SC, Pickens County, SC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Overton County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sevier County, TN, Smith County, TN, Unicoi County, TN, Union County, TN, Van Buren County, TN, White County, TN

The radar

The Knoxville radar (KMRX), 68 km from the middle of the area, began a volume at 07:59 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 8.0 hours before the alert went out and 239 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 69 J/kg
Mixed-layer CIN: -239 J/kg
Mixed-layer LCL: 1304 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 430 m²/s²
0-3 km storm-relative helicity: 877 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.

Issued	Product	Office	Counties	Lasted
May 20, 12:40 PM EDT	Mesoscale Discussion	SPC	Banks, Barrow, Bartow, Catoosa, Chattooga, Cherokee and 36 more	2 hr
May 20, 1:19 PM EDT	Severe Thunderstorm Watch	SPC	Banks, Catoosa, Dade, Dawson, Elbert, Fannin and 16 more	8 hr
May 20, 4:38 PM EDT	Mesoscale Discussion	SPC	Banks, Catoosa, Dade, Dawson, Elbert, Fannin and 15 more	97 min
May 20, 5:13 PM EDT	Severe Thunderstorm Watch	SPC	Barrow, Bartow, Burke, Chattooga, Cherokee, Clarke and 25 more	4 hr
May 20, 6:45 PM EDT	Mesoscale Discussion	SPC	Banks, Catoosa, Chattooga, Dade, Dawson, Elbert and 18 more	90 min
May 20, 12:07 AM EDT	Mesoscale Discussion	SPC	Cherokee, Clay, Graham, Macon, Swain	23 min
May 20, 12:09 AM EDT	Severe Thunderstorm Watch	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 2 more	6 hr
May 20, 3:04 PM EDT	Mesoscale Discussion	SPC	Anson, Cabarrus, Cleveland, Gaston, Hoke, Lincoln and 7 more	86 min
May 20, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	Anson, Bladen, Brunswick, Columbus, New Hanover, Pender and 3 more	7 hr
May 20, 7:31 PM EDT	Mesoscale Discussion	SPC	Carroll, Chester, Crockett, Decatur, Dyer, Fayette and 18 more	29 min
May 20, 7:59 PM EDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 24 more	6 hr

Nearby

Mesoscale Discussions in Tennessee, 2006 Mesoscale Discussions in North Carolina, 2006 Mesoscale Discussions in Georgia, 2006 Every 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.