Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 662

April 22, 2005Jackson County, Madison County, Alabama; 6 counties in Georgia; 36 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 6:40 PM CDT for Jackson County, Madison County, Alabama; 6 counties in Georgia; 36 counties in Tennessee. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 6:40 PM CDT (23:40 UTC)
Expired
Apr 22, 2005, 8:15 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 44 counties

Jackson County, AL, Madison County, AL, Catoosa County, GA, Dade County, GA, Gilmer County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Wilson County, TN

The radar

The Northeast Alabama radar (KHTX), 39 km from the middle of the area, began a volume at 23:40 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 12:00Z, 11.7 hours before the alert went out and 116 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 21, 9:23 PM CDTMesoscale DiscussionSPCBibb, Blount, Chilton, Colbert, Cullman, Fayette and 15 more97 min
Apr 22, 5:36 AM CDTMesoscale DiscussionSPCColbert, Cullman, Franklin, Jackson, Lauderdale, Lawrence and 5 more84 min
Apr 22, 9:15 AM CDTMesoscale DiscussionSPCBibb, Chilton, Fayette, Greene, Hale, Jefferson and 4 more90 min
Apr 22, 9:50 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 24 more5 hr
Apr 22, 12:41 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Coosa and 12 more64 min
Apr 22, 2:35 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 38 more6 hr
Apr 22, 2:49 PM CDTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 2 more86 min
Apr 22, 3:35 PM CDTSevere Thunderstorm WatchSPCColbert, DeKalb, Jackson, Lauderdale, Lawrence, Limestone and 2 more5 hr
Apr 22, 5:40 PM CDTSevere Thunderstorm WatchSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson5 hr
Apr 22, 6:15 PM CDTSevere Thunderstorm WatchSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more6 hr
Apr 22, 11:18 AM CDTMesoscale DiscussionSPCBanks, Bartow, Carroll, Cherokee, Clayton, Cobb and 23 more117 min
Apr 22, 12:10 PM CDTSevere Thunderstorm WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Butts and 66 more7 hr
Apr 22, 2:27 PM CDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Burke, Columbia, Crawford and 26 more93 min
Apr 22, 4:35 PM CDTSevere Thunderstorm WatchSPCAppling, Bryan, Bulloch, Burke, Candler, Chatham and 17 more5 hr
Apr 22, 5:17 PM CDTMesoscale DiscussionSPCCatoosa, Chattooga, Fannin, Gilmer, Gordon, Murray and 4 more58 min
Apr 21, 8:19 PM CDTMesoscale DiscussionSPCDyer, Lake, Obion86 min
Apr 22, 3:09 AM CDTMesoscale DiscussionSPCDyer, Lake, Obion66 min

Nearby

Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in Georgia, 2005Mesoscale Discussions in Alabama, 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.