Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 1306
The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2011, 9:07 PM EDT for Rabun County, Towns County, Georgia; 7 counties in North Carolina; 27 counties in Tennessee. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2011, 9:07 PM EDT (01:07 UTC)
- Expired
- Jun 19, 2011, 10:00 PM EDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
All 36 counties
Rabun County, GA, Towns County, GA, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Swain County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cannon County, TN, Cocke County, TN, Cumberland County, TN, DeKalb County, TN, Grainger County, TN, Hamblen County, TN, Hamilton County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN
The radar
The Knoxville radar (KMRX), 114 km from the middle of the area, began a volume at 01:11 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 1.1 hours before the alert went out and 206 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
- 3898 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 955 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 14.9
The text
As transmitted, in the capitals the NWS used until 2016.
801
ACUS11 KWNS 200107
SWOMCD
SPC MCD 200107
NCZ000-TNZ000-SCZ000-GAZ000-200200-
MESOSCALE DISCUSSION 1306
NWS STORM PREDICTION CENTER NORMAN OK
0807 PM CDT SUN JUN 19 2011
AREAS AFFECTED...MIDDLE/ERN TN...
CONCERNING...TORNADO WATCH 514...
VALID 200107Z - 200200Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 514 CONTINUES.
WW 511 WAS LOCALLY EXTENDED BY WFO MRX THROUGH 02Z. A NEW WW MAY BE
NEEDED TO REPLACE THIS EXTENSION BY 02Z AND MAY INCLUDE PORTIONS OF
WRN NC.
A PERSISTENT SUPERCELL WITH A HISTORY OF REPORTED GOLF BALL TO
BASEBALL-SIZED HAIL WAS CENTERED OVER CUMBERLAND/WHITE COUNTIES AS
OF 01Z. ADDITIONAL TSTM DEVELOPMENT HAS OCCURRED W/SWWD ALONG THE
FLANKING LINE/OUTFLOW...SUGGESTIVE OF SOME UPSCALE GROWTH INTO A
BROADER CLUSTER. 00Z BNA RAOB SAMPLED A VERY UNSTABLE AIR MASS WITH
MLCAPE AROUND 4000 J/KG. GIVEN EFFECTIVE SHEAR AROUND 40
KT...SUPERCELL STRUCTURES WILL LIKELY PERSIST WITH ATTENDANT LARGE
HAIL AND AN INCREASING DAMAGING WIND THREAT IF UPSCALE GROWTH
CONTINUES. ONSET OF NOCTURNAL COOLING/INCREASING MLCIN WOULD SUGGEST
THE OVERALL TORNADO THREAT WILL GRADUALLY SUBSIDE THIS EVENING.
..GRAMS.. 06/20/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GSP...MRX...FFC...OHX...
LAT...LON 35788624 35968614 36188522 36408378 36158305 35788273
34998296 34848331 34878392 34918431 35178523 35788624SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 9:41 PM EDT | Severe Thunderstorm Watch | SPC | Elbert, Fannin, Franklin, Habersham, Hart, Lumpkin and 5 more | 5 hr |
| Jun 20, 9:53 AM EDT | Mesoscale Discussion | SPC | Madison, Mitchell, Yancey | 97 min |
| Jun 20, 12:46 PM EDT | Mesoscale Discussion | SPC | Alexander, Ashe, Avery, Burke, Caldwell, Mitchell and 2 more | 59 min |
| Jun 20, 2:36 PM EDT | Mesoscale Discussion | SPC | Alamance, Caswell, Orange | 54 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in North Carolina, 2011Mesoscale Discussions in Georgia, 2011Every mesoscale discussion in 2011
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.