Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 347
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 2:08 PM CDT for 8 counties in Kentucky; 47 counties in Tennessee. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2011, 2:08 PM CDT (19:08 UTC)
- Expired
- Apr 4, 2011, 3:15 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
All 55 counties
Allen County, KY, Clinton County, KY, Cumberland County, KY, McCreary County, KY, Monroe County, KY, Russell County, KY, Wayne County, KY, Whitley County, KY, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Campbell County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Knox County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Moore 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, Sequatchie County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN, Wilson County, TN
The radar
The Nashville radar (KOHX), 86 km from the middle of the area, began a volume at 19:09 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, 7.1 hours before the alert went out and 81 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
- 68 J/kg
- Mixed-layer CIN
- -640 J/kg
- Mixed-layer LCL
- 855 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 370 m²/s²
- 0-3 km storm-relative helicity
- 507 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
265
ACUS11 KWNS 041908
SWOMCD
SPC MCD 041908
TNZ000-KYZ000-GAZ000-ALZ000-042015-
MESOSCALE DISCUSSION 0347
NWS STORM PREDICTION CENTER NORMAN OK
0208 PM CDT MON APR 04 2011
AREAS AFFECTED...MIDDLE TN
CONCERNING...TORNADO WATCH 92...
VALID 041908Z - 042015Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 92 CONTINUES.
LEADING EDGE OF STRONGLY FORCED/VERY FAST-MOVING QLCS EXTENDED FROM
SUMNER TO WAYNE COUNTIES AS OF 1900Z. RECENT FORWARD PROPAGATION OF
60-70 KT SUGGESTS THE LINE SHOULD REACH THE ERN EXTENT OF WW 92 NEAR
21Z. AMBIENT AIR MASS OVER MIDDLE TN REMAINS QUITE FAVORABLE FOR
WIDESPREAD DAMAGING WINDS /LOCALLY SIGNIFICANT/ AND TRANSIENT
CIRCULATIONS WITH ISOLATED TORNADOES. 18Z BNA RAOB SAMPLED SFC-1 KM
SHEAR OF 50 KT WITH A VEER-BACK MID-LEVEL WIND PROFILE SIGNATURE.
DOWNSTREAM AIR MASS DESTABILIZATION WILL SUPPORT PRIMARILY A
DAMAGING WIND THREAT CONTINUING E OF WW 92 WHERE A NEW SEVERE TSTM
WATCH HAS BEEN JUST ISSUED FOR ERN TN.
..GRAMS.. 04/04/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MRX...JKL...FFC...LMK...OHX...HUN...MEG...
LAT...LON 35198802 36538680 36968585 37018472 36888390 36548372
36038388 35148493 34958542 34918566 34938624 34918693
35028785 35198802SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 4:30 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Campbell, Kenton | 8 hr |
| Apr 4, 6:53 AM CDT | Mesoscale Discussion | SPC | Boone, Breckinridge, Caldwell, Carroll, Crittenden, Daviess and 16 more | 2 hr |
| Apr 4, 7:22 AM CDT | Tornado Watch | SPC | Ballard, Breckinridge, Butler, Caldwell, Calloway, Carlisle and 24 more | 7 hr |
| Apr 4, 11:34 AM CDT | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more | 5 hr |
| Apr 4, 11:50 AM CDT | Mesoscale Discussion | SPC | Boone, Campbell, Kenton | 25 min |
| Apr 4, 1:25 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 74 more | 65 min |
| Apr 4, 2:05 PM CDT | Severe Thunderstorm Watch | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clay and 33 more | 6 hr |
| Apr 4, 3:49 PM CDT | Mesoscale Discussion | SPC | Bell, Boyd, Breathitt, Carter, Clay, Elliott and 21 more | 56 min |
| Apr 4, 5:00 PM CDT | Mesoscale Discussion | SPC | Bell, Boyd, Breathitt, Clay, Floyd, Harlan and 12 more | 90 min |
| Apr 4, 10:25 AM CDT | Mesoscale Discussion | SPC | Bedford, Cannon, Cheatham, Davidson, Decatur, Dickson and 19 more | 2 hr |
| Apr 4, 1:03 PM CDT | Tornado Watch | SPC | Franklin, Lincoln, Moore | 7 hr |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 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.