Alert archive / Tennessee / Mesoscale Discussions in 2003
Mesoscale Discussion 2174
The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2003, 6:16 PM EDT for 6 states. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2003, 6:16 PM EDT (22:16 UTC)
- Expired
- Aug 17, 2003, 7:15 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 75 counties
Rabun County, GA, Bell County, KY, Clay County, KY, Harlan County, KY, Jackson County, KY, Knox County, KY, Laurel County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, McCreary County, KY, Perry County, KY, Pulaski County, KY, Rockcastle County, KY, Wayne County, KY, Whitley County, KY, Avery County, NC, 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, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Swain County, NC, Transylvania County, NC, Yancey County, NC, Greenville County, SC, Pickens County, SC, Spartanburg County, SC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Campbell County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Pickett County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, City of Bristol, VA, City of Norton, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA
The radar
The Knoxville radar (KMRX), 49 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 245 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.
- Mixed-layer CAPE
- 1443 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
156 ACUS11 KWNS 172216 SWOMCD SPC MCD 172216 NCZ000-VAZ000-SCZ000-TNZ000-KYZ000-GAZ000-172315- MESOSCALE DISCUSSION 2174 NWS STORM PREDICTION CENTER NORMAN OK 0516 PM CDT SUN AUG 17 2003 AREAS AFFECTED...SERN KY ERN TN WRN NC CONCERNING...SEVERE THUNDERSTORM WATCH 865... VALID 172216Z - 172315Z STRONG TO SEVERE THUNDERSTORMS CONTINUE TO INTERMITTENTLY DEVELOP OVER ERN HALF OF WW...WHERE INSTABILITY ANALYSIS MAINTAINS 2000-2500 J/KG MLCAPE. THOUGH MODERATE INSTABILITY REMAINS IN PLACE...WEAK ASCENT AND LACK OF PRONOUNCED LOW LEVEL FOCUS APPEAR TO HAVE HINDERED MORE WIDESPREAD STRONG/SEVERE THUNDERSTORM DEVELOPMENT. THIS TREND IS EXPECTED TO CONTINUE...WITH NO MORE THAN ISOLATED SEVERE THUNDERSTORMS DEVELOPING INTO AND JUST WEST OF THE SRN APPALACHIANS THROUGH THE EARLY EVENING. IN ADDITION...STRONGER STORMS WELL WEST / OVER WRN TN/NRN MS/WRN KS / ARE MOVING SWD AND SHOULD NOT THREATEN AREAS WITHIN WW 865. THEREFORE...WW IS EXPECTED TO EXPIRE AT 23Z. ..EVANS.. 08/17/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RNK...RLX...GSP...MRX...JKL...FFC...LMK...OHX... 35388545 37668478 36878183 34508189
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | Rabun, Towns | 6 hr |
| Aug 17, 4:27 PM EDT | Mesoscale Discussion | SPC | Rabun | 2 hr |
| Aug 17, 12:06 PM EDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clay, Estill, Floyd, Harlan and 10 more | 114 min |
| Aug 17, 2:48 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Carlisle, Crittenden, Graves, Henderson and 9 more | 117 min |
| Aug 17, 4:10 PM EDT | Severe Thunderstorm Watch | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more | 6 hr |
| Aug 17, 7:51 PM EDT | Mesoscale Discussion | SPC | Caldwell, Calloway, Carlisle, Christian, Crittenden, Fulton and 12 more | 54 min |
| Aug 17, 1:52 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Bertie, Cabarrus, Caswell and 40 more | 113 min |
| Aug 17, 2:20 PM EDT | Severe Thunderstorm Watch | SPC | Alamance, Alexander, Alleghany, Ashe, Burke, Cabarrus and 40 more | 6 hr |
| Aug 17, 6:25 PM EDT | Mesoscale Discussion | SPC | Alamance, Alexander, Alleghany, Anson, Ashe, Bertie and 54 more | 2 hr |
Nearby
Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in North Carolina, 2003Mesoscale Discussions in Kentucky, 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.