Alert archive / Tennessee / Mesoscale Discussions in 2012
Mesoscale Discussion 1068
The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2012, 1:49 AM CDT for 12 counties in Tennessee. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jun 5, 2012, 1:49 AM CDT (06:49 UTC)
- Expired
- Jun 5, 2012, 2:45 AM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
Counties Chester County, TN, Decatur County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Lawrence County, TN, Lewis County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Perry County, TN, Wayne County, TN
The radar
The Nashville radar (KOHX), 151 km from the middle of the area, began a volume at 06:51 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 00:00Z, 6.8 hours before the alert went out and 140 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
- 162 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 1734 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
901 ACUS11 KWNS 050649 SWOMCD SPC MCD 050649 TNZ000-ALZ000-050745- MESOSCALE DISCUSSION 1068 NWS STORM PREDICTION CENTER NORMAN OK 0149 AM CDT TUE JUN 05 2012 AREAS AFFECTED...SWRN THROUGH SRN MIDDLE TN CONCERNING...SEVERE THUNDERSTORM WATCH 357... VALID 050649Z - 050745Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 357 CONTINUES. SUMMARY...STORMS MAY REMAIN CAPABLE OF ISOLATED STRONG WIND GUSTS OVER A PORTION OF SWRN TN DURING THE NEXT HOUR...BUT OVERALL SEVERE THREAT IS BECOMING INCREASINGLY MARGINAL. STORMS SHOULD BEGIN MOVING SOUTH OF WW 357 BY 08Z...BUT ANOTHER WW IS NOT ANTICIPATED. DISCUSSION...A CLUSTER OF MULTICELLS CONTINUES MOVING SOUTH THROUGH A PORTION OF WRN AND MIDDLE TN AT AROUND 25 KT. ACTIVITY IS EMBEDDED IN WEAK VERTICAL SHEAR AND MARGINAL INSTABILITY. SOME BACKBUILDING HAS BEEN NOTED ON WRN FLANK...AND ISOLATED STRONG WIND GUSTS REMAIN POSSIBLE AS ACTIVITY DEVELOPS SWD. HOWEVER...OVERALL THREAT IS EXPECTED TO CONTINUE A GRADUAL DECREASE. ..DIAL.. 06/05/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OHX...HUN...MEG... LAT...LON 35628871 35838789 35478651 34978693 35088863 35628871
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 9:11 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Carroll, Cheatham, Chester, Crockett and 35 more | 94 min |
| Jun 4, 9:43 PM CDT | Severe Thunderstorm Watch | SPC | Bedford, Benton, Carroll, Cheatham, Chester, Crockett and 34 more | 6 hr |
Nearby
Mesoscale Discussions in Tennessee, 2012Every mesoscale discussion in 2012
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.