Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 2529

November 18, 20037 counties in Georgia; 4 counties in North Carolina; 26 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 5:58 PM EST for 7 counties in Georgia; 4 counties in North Carolina; 26 counties in Tennessee. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued
Nov 18, 2003, 5:58 PM EST (22:58 UTC)
Expired
Nov 18, 2003, 6:30 PM EST
In force
32 min
Issued by
the Storm Prediction Center
All 37 counties

Catoosa County, GA, Chattooga County, GA, Dade County, GA, Fannin County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Cherokee County, NC, Graham County, NC, Madison County, NC, Swain County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Hamblen County, TN, Hamilton County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Van Buren County, TN

The radar

The Knoxville radar (KMRX), 120 km from the middle of the area, began a volume at 22:58 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, 11.0 hours before the alert went out and 202 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 2003-11-18Temperature 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, Nashville Metro, TN at 12:00Z on 2003-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 325 square meters per square second.19395878Sfc1 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
1000 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
325 m²/s²
0-3 km storm-relative helicity
386 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
Nov 18, 2:33 PM ESTMesoscale DiscussionSPCCatoosa, Chattooga, Dade, Murray, Walker, Whitfield57 min
Nov 18, 2:55 PM ESTTornado WatchSPCCatoosa, Chattooga, Dade, Gordon, Murray, Walker and 1 more5 hr
Nov 18, 2:59 PM ESTMesoscale DiscussionSPCBaker, Bartow, Calhoun, Carroll, Chattahoochee, Cherokee and 40 more91 min
Nov 18, 4:26 PM ESTMesoscale DiscussionSPCFannin, Gilmer, Gordon, Murray, Whitfield94 min
Nov 18, 5:31 PM ESTMesoscale DiscussionSPCBaker, Calhoun, Carroll, Chattahoochee, Clay, Coweta and 27 more29 min
Nov 18, 5:55 PM ESTTornado WatchSPCCalhoun, Chattahoochee, Clay, Early, Harris, Lamar and 17 more5 hr
Nov 18, 2:29 AM ESTMesoscale DiscussionSPCDyer, Fayette, Haywood, Lake, Lauderdale, Obion and 2 more3 hr
Nov 18, 2:55 AM ESTTornado WatchSPCDyer, Lake, Lauderdale, Shelby, Tipton6 hr
Nov 18, 7:08 AM ESTMesoscale DiscussionSPCChester, Fayette, Hardeman, Hardin, Haywood, McNairy and 1 more2 hr
Nov 18, 7:55 AM ESTTornado WatchSPCBenton, Carroll, Cheatham, Chester, Crockett, Davidson and 29 more5 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in North Carolina, 2003Every mesoscale discussion in 2003

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.