Alert archive / Tennessee / Mesoscale Discussions in 2003
Mesoscale Discussion 418
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2003, 3:02 PM CDT for 24 counties in Tennessee. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2003, 3:02 PM CDT (20:02 UTC)
- Expired
- Apr 6, 2003, 5:00 PM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 24 counties
Bedford County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Houston County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Rutherford County, TN, Smith County, TN, Trousdale County, TN, Warren County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 54 km from the middle of the area, began a volume at 20:02 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, 8.0 hours before the alert went out and 41 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
- 1528 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 304 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 062003 SWOMCD SPC MCD 062002 TNZ000-ALZ000-062200- MESOSCALE DISCUSSION 0418 NWS STORM PREDICTION CENTER NORMAN OK 0302 PM CDT SUN APR 06 2003 AREAS AFFECTED...MIDDLE TN CONCERNING...SEVERE THUNDERSTORM WATCH 104... VALID 062002Z - 062200Z ...MAIN THREAT FROM SEVERE THUNDERSTORMS WILL BE LARGE HAIL... SFC WARM FRONT EXTENDED FROM SOUTHEAST OF MEMPHIS THROUGH MIDDLE TN TO JUST SOUTHEAST OF KNOXVILLE AT 06/20Z. LATEST OBSERVATIONAL ANALYSIS FIELDS INDICATE ELEVATED CAPE VALUES ARE AROUND 1000 J/KG...WITH DEEP LAYER SHEAR VALUES OVER 50 KTS PER THE LATEST VAD WIND PROFILE FROM MEMPHIS. DEEP LAYER SHEAR WILL INCREASE FROM WEST TO EAST AS MID LEVEL SPEED MAX APPROACHES...SUPPORTING THE DEVELOPMENT OF SUPERCELL TSTMS. AS STORMS MOVE NORTH AWAY FROM THE WARM FRONT AND BECOME MORE ELEVATED...THE MAIN THREAT WITH STORMS WILL BE LARGE HAIL. ..TAYLOR.. 04/06/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MRX...OHX...HUN... 36338775 36438575 35128569 34938740
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 9:19 AM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Davidson, Dickson and 18 more | 116 min |
| Apr 6, 11:05 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Chester, Crockett, Decatur, Dyer and 11 more | 5 hr |
| Apr 6, 12:27 PM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Gibson, Hardeman, Haywood and 4 more | 2 hr |
| Apr 6, 1:07 PM CDT | Mesoscale Discussion | SPC | Bedford, Bledsoe, Bradley, Cannon, Cheatham, Coffee and 33 more | 113 min |
| Apr 6, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 28 more | 6 hr |
Nearby
Mesoscale Discussions in Tennessee, 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.