Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 2524

November 18, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2003, 1:33 PM CST for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Nov 18, 2003, 1:33 PM CST (19:33 UTC)
Expired
Nov 18, 2003, 2:30 PM CST
In force
57 min
Issued by
the Storm Prediction Center
All 68 counties

DeKalb County, AL, Jackson County, AL, Madison County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Adair County, KY, Allen County, KY, Barren County, KY, Boyle County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Green County, KY, Hart County, KY, Larue County, KY, Marion County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Bedford County, TN, Bledsoe County, TN, Bradley County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 88 km from the middle of the area, began a volume at 19:36 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, 7.6 hours before the alert went out and 92 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, 6:08 AM CSTMesoscale DiscussionSPCChoctaw, Colbert, Franklin, Lamar, Marion, Pickens and 1 more2 hr
Nov 18, 6:55 AM CSTTornado WatchSPCChoctaw, Colbert, Fayette, Franklin, Greene, Lamar and 9 more5 hr
Nov 18, 8:58 AM CSTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Crenshaw and 4 more92 min
Nov 18, 10:30 AM CSTMesoscale DiscussionSPCBaldwin, Bibb, Blount, Butler, Chilton, Choctaw and 26 more90 min
Nov 18, 11:25 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Blount, Butler, Calhoun and 38 more6 hr
Nov 18, 1:55 PM CSTTornado WatchSPCDeKalb, Jackson5 hr
Nov 18, 1:59 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Calhoun, Chambers and 23 more91 min
Nov 18, 4:31 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Chambers, Clay, Cleburne and 16 more29 min
Nov 18, 4:55 PM CSTTornado WatchSPCBarbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 11 more5 hr
Nov 18, 3:26 PM CSTMesoscale DiscussionSPCFannin, Gilmer, Gordon, Murray, Whitfield94 min
Nov 18, 4:58 PM CSTMesoscale DiscussionSPCCatoosa, Chattooga, Dade, Fannin, Murray, Walker and 1 more32 min
Nov 18, 1:29 AM CSTMesoscale DiscussionSPCBallard, Fulton3 hr
Nov 18, 7:35 AM CSTMesoscale DiscussionSPCBallard, Carlisle, Crittenden, Henderson, Livingston, Lyon and 4 more115 min
Nov 18, 1:55 AM CSTTornado WatchSPCDyer, Lake, Lauderdale, Shelby, Tipton6 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in Georgia, 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.