Alert archive / Tennessee / Mesoscale Discussions in 2003
Mesoscale Discussion 679
The Storm Prediction Center issued this mesoscale discussion at May 2, 2003, 8:52 AM CDT for 4 counties in Kentucky; 29 counties in Tennessee. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- May 2, 2003, 8:52 AM CDT (13:52 UTC)
- Expired
- May 2, 2003, 10:45 AM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 33 counties
Allen County, KY, Clinton County, KY, Cumberland County, KY, Monroe County, KY, Anderson County, TN, Bledsoe County, TN, Campbell County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Jackson County, TN, Macon County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott 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), 57 km from the middle of the area, began a volume at 13:54 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, 1.9 hours before the alert went out and 61 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1266 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
996 ACUS11 KWNS 021353 SWOMCD SPC MCD 021352 TNZ000-KYZ000-021545- MESOSCALE DISCUSSION 0679 NWS STORM PREDICTION CENTER NORMAN OK 0852 AM CDT FRI MAY 02 2003 AREAS AFFECTED...SRN KY/NRN-WRN TN CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 021352Z - 021545Z SHORT ELEVATED CONVECTIVE LINE WILL CONTINUE EWD WITH THE POTENTIAL FOR AN ISOLATED WIND DAMAGE OR HAIL OVER THE NEXT FEW HOURS. WW IS NOT ANTICIPATED ATTM. AN AXIS OF SFC DEWPOINTS AROUND 60 F EXTENDED NWD THROUGH THE MS RIVER VALLEY AND NEWD INTO SCNTRL KY. CONVECTION WAS BEING SUSTAINED BY LARGE-SCALE FORCING WITH A VORT MAX EVIDENT ON WV IMAGERY ACROSS NCNTRL TN. LOW-LEVEL MOISTURE AND STEEP LAPSE RATES WERE CONTRIBUTING TO MODERATE INSTABILITY WITH MLCAPE AROUND 1500 J/KG. CONVECTION SHOULD CONTINUE AS THE INSTABILITY AXIS SHIFTS EWD WITH AN ISOLATED HAIL OR WIND DAMAGE POSSIBLE. BNA 12Z SOUNDING SHOWED MARGINAL DEEP LAYER SHEAR AROUND 30 KT WITH A WEAK INVERSION NEAR 850 MB. AS A RESULT...CONVECTION SHOULD REMAIN ELEVATED AS IT MOVES EWD WITH A LIMITED SEVERE WEATHER POTENTIAL...THOUGH SFC-BASED PTNL WILL INCREASE AS TEMPS WARM INTO THE LOWER 70S. WW IS NOT ANTICIPATED ATTM. ..BROYLES.. 05/02/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MRX...JKL...LMK...OHX... 36098750 36538659 36968604 36808502 36278387 35488486 35508606
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 3:36 PM CDT | Mesoscale Discussion | SPC | Anderson, Bourbon, Boyle, Bracken, Clark, Fayette and 20 more | 114 min |
| May 2, 1:23 PM CDT | Mesoscale Discussion | SPC | Carter, Cocke, Greene, Hamblen, Hawkins, Jefferson and 4 more | 2 hr |
| May 2, 1:35 PM CDT | Severe Thunderstorm Watch | SPC | Carter, Cocke, Greene, Hawkins, Johnson, Sullivan and 2 more | 5 hr |
| May 2, 1:43 PM CDT | Mesoscale Discussion | SPC | Chester, Fayette, Giles, Hardeman, Hardin, Lawrence and 4 more | 92 min |
| May 2, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Bledsoe, Bradley, Chester, Coffee, Decatur and 20 more | 5 hr |
| May 2, 2:55 PM CDT | Severe Thunderstorm Watch | SPC | Fayette | 6 hr |
| May 2, 5:36 PM CDT | Mesoscale Discussion | SPC | Bedford, Bradley, Chester, Coffee, Franklin, Giles and 16 more | 84 min |
Nearby
Mesoscale Discussions in Tennessee, 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.