Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 912
The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 7:47 PM CDT for 27 counties in Kentucky; 5 counties in Mississippi; 38 counties in Tennessee. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2011, 7:47 PM CDT (00:47 UTC)
- Expired
- May 23, 2011, 8:45 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 70 counties
Adair County, KY, Allen County, KY, Barren County, KY, Butler County, KY, Caldwell County, KY, Christian County, KY, Cumberland County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Hart County, KY, Hopkins County, KY, Larue County, KY, Logan County, KY, Marion County, KY, McLean County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Washington County, KY, Alcorn County, MS, Benton County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Bedford County, TN, Benton County, TN, Cannon County, TN, Cheatham County, TN, Chester County, TN, Clay County, TN, Coffee County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Giles County, TN, Hardin County, TN, Henderson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Perry County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 0.8 hours before the alert went out and 88 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
- 1402 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 1214 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 7.3
The text
As transmitted, in the capitals the NWS used until 2016.
115
ACUS11 KWNS 240047
SWOMCD
SPC MCD 240047
KYZ000-TNZ000-ALZ000-MSZ000-240145-
MESOSCALE DISCUSSION 0912
NWS STORM PREDICTION CENTER NORMAN OK
0747 PM CDT MON MAY 23 2011
AREAS AFFECTED...PORTIONS OF WRN/CNTRL KY...WRN/MIDDLE TN
CONCERNING...SEVERE THUNDERSTORM WATCH 347...
VALID 240047Z - 240145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 347
CONTINUES.
AT 0040Z...REGIONAL RADAR IMAGERY INDICATES QLCS CONTINUES TO MOVE
EWD AT AROUND 30-40 KT OVER PORTIONS OF WRN KY/TN. OBJECTIVE
ANALYSIS GUIDANCE AND 00Z BNA RAOB SHOWS MLCAPE VALUES RESIDING
AROUND 1500 J/KG DOWNSTREAM FROM THE QLCS...WITH EFFECTIVE BULK
SHEAR NEAR 50 KT. THIS MAY AID CONTINUED MCS MAINTENANCE FOR THE
NEXT FEW HRS...BEFORE BOUNDARY LAYER BEGINS TO COOL/STABILIZE DURING
THE NIGHT. IN THE SHORT TERM...THREAT FOR DAMAGING WINDS/LARGE HAIL
WILL CONTINUE. IN ADDITION...COUNTIES MAY NEED TO BE ADDED TO WW 347
DURING THE NEXT HR OR SO OVER PORTIONS OF CNTRL KY AND MIDDLE
TN...IF MCS CONTINUES TO MAINTAIN INTENSITY.
..GARNER.. 05/24/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...OHX...HUN...PAH...MEG...
LAT...LON 37288801 37748707 37768496 36088542 34948654 34998808
34468816 34588931 34978926 35898822 36638782 37288801SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 7:31 PM CDT | Severe Thunderstorm Watch | SPC | Bath, Boyd, Carter, Elliott, Fleming, Greenup and 6 more | 3 hr |
| May 24, 5:24 AM CDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Casey, Clay and 18 more | 96 min |
| May 24, 6:01 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Barren, Bell, Breathitt, Casey and 38 more | 8 hr |
| May 24, 7:34 AM CDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 13 more | 116 min |
| May 24, 11:55 AM CDT | Mesoscale Discussion | SPC | Adair, Allen, Barren, Bell, Clay, Clinton and 15 more | 65 min |
| May 24, 12:57 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Barren, Bell, Clay, Clinton and 14 more | 6 hr |
| May 24, 2:33 PM CDT | Mesoscale Discussion | SPC | Harlan | 87 min |
| May 24, 3:27 PM CDT | Mesoscale Discussion | SPC | Bell, Harlan, Letcher, Whitley | 63 min |
| May 24, 6:46 PM CDT | Mesoscale Discussion | SPC | Anderson, Bledsoe, Blount, Campbell, Carter, Claiborne and 26 more | 59 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Mississippi, 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.