Alert archive / Tennessee / Mesoscale Discussions in 2013
Mesoscale Discussion 1021
The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2013, 5:05 PM CDT for 4 counties in Alabama; 28 counties in Tennessee. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jun 10, 2013, 5:05 PM CDT (22:05 UTC)
- Expired
- Jun 10, 2013, 6:30 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 32 counties
Jackson County, AL, Lauderdale County, AL, Limestone County, AL, Madison County, AL, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Overton County, TN, Putnam County, TN, Rutherford County, TN, Sequatchie County, TN, Smith County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Northeast Alabama radar (KHTX), 69 km from the middle of the area, began a volume at 22:06 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, 10.1 hours before the alert went out and 73 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
- 439 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 498 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
584
ACUS11 KWNS 102205
SWOMCD
SPC MCD 102205
TNZ000-GAZ000-ALZ000-102330-
MESOSCALE DISCUSSION 1021
NWS STORM PREDICTION CENTER NORMAN OK
0505 PM CDT MON JUN 10 2013
AREAS AFFECTED...MIDDLE TN...FAR NRN AL
CONCERNING...TORNADO WATCH 294...
VALID 102205Z - 102330Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 294 CONTINUES.
SUMMARY...SEVERE THREAT APPEARS RATHER LOCALIZED AND SHOULD REMAIN
SO NEAR-TERM AS PRIMARY BELT OF FORCED ASCENT SHIFTS DOWNSTREAM OF
WW 294. DOWNSTREAM WW INTO NRN AL NOT ANTICIPATED ATTM.
DISCUSSION...THE HIGHER MID-LEVEL REFLECTIVITY CORES ASSOCIATED WITH
TN VALLEY CONVECTION HAVE REMAINED ACROSS CNTRL KY AND ARE ABOUT TO
CROSS WW 294 INTO WW 295 IN ERN TN. THIS TREND SHOULD CONTINUE OVER
THE NEXT COUPLE OF HOURS AS WELL-DEFINED SHORTWAVE TROUGH IN WATER
VAPOR IMAGERY SHIFTS EWD. WITH A W/NWLY LOW/MID-LEVEL FLOW REGIME IN
THE WAKE OF THE TROUGH AXIS PASSING...WARMING/SUBSIDENCE MAY PROVE
DETRIMENTAL TO SUSTAINING MORE THAN JUST A MARGINAL SEVERE THREAT
NEAR-TERM ACROSS MIDDLE TN. STILL...SUFFICIENT LOW-LEVEL VEERING
WITH HEIGHT EXISTS IN THE OHX VWP FOR A RISK OF A BRIEF TORNADO OR
TWO.
..GRAMS.. 06/10/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MRX...FFC...OHX...HUN...
LAT...LON 36458617 36488512 36108485 34868551 34818558 34548586
34598723 34968773 35588761 36158671 36458617SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 7:30 PM CDT | Mesoscale Discussion | SPC | Colbert, Lauderdale | 60 min |
| Jun 10, 1:32 PM CDT | Mesoscale Discussion | SPC | Anderson, Bedford, Bledsoe, Campbell, Cannon, Cheatham and 48 more | 88 min |
| Jun 10, 1:56 PM CDT | Tornado Watch | SPC | Bedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more | 7 hr |
| Jun 10, 2:02 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 26 more | 7 hr |
| Jun 10, 5:27 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 21 more | 93 min |
Nearby
Mesoscale Discussions in Tennessee, 2013Mesoscale Discussions in Alabama, 2013Every mesoscale discussion in 2013
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.