Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 659

April 22, 200510 counties in Georgia; 6 counties in North Carolina; 29 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 6:17 PM EDT for 10 counties in Georgia; 6 counties in North Carolina; 29 counties in Tennessee. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 6:17 PM EDT (22:17 UTC)
Expired
Apr 22, 2005, 7:15 PM EDT
In force
58 min
Issued by
the Storm Prediction Center
All 45 counties

Catoosa County, GA, Chattooga County, GA, Fannin County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Union County, GA, Walker County, GA, Whitfield County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Madison County, NC, Swain County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Van Buren County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 125 km from the middle of the area, began a volume at 22:17 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, 10.3 hours before the alert went out and 216 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 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 280 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 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 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
280 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
1102 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
162 m²/s²
0-3 km storm-relative helicity
142 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
Apr 22, 12:18 PM EDTMesoscale DiscussionSPCBanks, Bartow, Carroll, Cherokee, Clayton, Cobb and 23 more117 min
Apr 22, 1:10 PM EDTSevere Thunderstorm WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 66 more7 hr
Apr 22, 3:27 PM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Burke, Columbia, Crawford and 26 more93 min
Apr 22, 3:35 PM EDTSevere Thunderstorm WatchSPCQuitman6 hr
Apr 22, 5:35 PM EDTSevere Thunderstorm WatchSPCAppling, Bryan, Bulloch, Burke, Candler, Chatham and 17 more5 hr
Apr 22, 6:40 PM EDTSevere Thunderstorm WatchSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Clayton and 17 more5 hr
Apr 22, 7:15 PM EDTSevere Thunderstorm WatchSPCAtkinson, Bacon, Baker, Ben Hill, Berrien, Brooks and 28 more6 hr
Apr 22, 7:40 PM EDTMesoscale DiscussionSPCCatoosa, Dade, Gilmer, Murray, Walker, Whitfield95 min
Apr 22, 2:35 PM EDTSevere Thunderstorm WatchSPCAlamance, Alexander, Alleghany, Ashe, Burke, Cabarrus and 25 more5 hr
Apr 21, 9:19 PM EDTMesoscale DiscussionSPCDyer, Lake, Obion86 min
Apr 21, 10:23 PM EDTMesoscale DiscussionSPCBedford, Benton, Cheatham, Davidson, Decatur, Dickson and 18 more97 min
Apr 22, 4:09 AM EDTMesoscale DiscussionSPCDyer, Lake, Obion66 min
Apr 22, 6:36 AM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 39 more84 min
Apr 22, 3:49 PM EDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Coffee and 27 more86 min
Apr 22, 4:35 PM EDTSevere Thunderstorm WatchSPCBedford, Benton, Cannon, Cheatham, Coffee, Davidson and 23 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in North Carolina, 2005Every mesoscale discussion in 2005

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.