Alert archive / Kentucky / Mesoscale Discussions in 2011
Mesoscale Discussion 852
The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 12:55 PM CDT for 6 states. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 12:55 PM CDT (17:55 UTC)
- Expired
- May 22, 2011, 2:00 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 149 counties
Cullman County, AL, DeKalb County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Fannin County, GA, Murray County, GA, Walker County, GA, Whitfield County, GA, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Bell County, KY, Bourbon County, KY, Boyle County, KY, Breathitt County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Harlan County, KY, Hart County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, McCreary County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Morgan County, KY, Nelson County, KY, Nicholas County, KY, Owsley County, KY, Perry County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Russell County, KY, Scott County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Cherokee County, NC, Graham County, NC, Swain County, NC, Anderson County, TN, Bedford County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Cannon County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Lincoln County, TN, Loudon County, TN, Macon County, TN, Marion County, TN, Marshall County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, White County, TN, Williamson County, TN, Wilson County, TN, City of Norton, VA, Lee County, VA, Scott County, VA, Wise County, VA
The radar
The Nashville radar (KOHX), 112 km from the middle of the area, began a volume at 17:55 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 12:00Z, 5.9 hours before the alert went out and 116 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
- 1543 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 1025 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 215 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
101
ACUS11 KWNS 221755
SWOMCD
SPC MCD 221755
TNZ000-KYZ000-VAZ000-NCZ000-GAZ000-ALZ000-221900-
MESOSCALE DISCUSSION 0852
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM CDT SUN MAY 22 2011
AREAS AFFECTED...NRN AL...NWRN GA...MIDDLE/ERN TN...CNTRL/ERN KY
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 221755Z - 221900Z
THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE THROUGH THE
AFTERNOON HOURS ACROSS PORTIONS OF TN VALLEY. A FEW SEVERE STORMS
ARE POSSIBLE. A WW WILL LIKELY BE NEEDED SOON.
LATEST VISIBLE SATELLITE IMAGERY SHOWS AN INCREASING CU FIELD WITH
ISOLATED THUNDERSTORMS BEGINNING TO DEVELOP ACROSS PORTIONS OF
MIDDLE TN AND NORTHERN AL. THIS ACTIVITY IS INTENSIFYING AHEAD OF A
WEAK MID LEVEL SHORTWAVE TROUGH MOVING ACROSS AR/WEST TN...AND IN
REGION WHERE SUBSTANTIAL HEATING HAS ALREADY OCCURRED TODAY.
DEWPOINTS IN THE MID 60S ARE YIELDING MINIMAL CINH AND MLCAPE VALUES
APPROACHING 2000 J/KG. LOW LEVEL WINDS ARE NOT PARTICULARLY STRONG
IN THIS REGION...BUT FORECAST SOUNDINGS SHOW 35-40 KNOTS OF DEEP
LAYER EFFECTIVE SHEAR AND RELATIVELY STEEP MID LEVEL LAPSE RATES.
THIS SHOULD PROMOTE ORGANIZED MULTICELL OR SUPERCELL STORMS CAPABLE
OF LARGE HAIL AND DAMAGING WINDS.
..HART.. 05/22/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RLX...GSP...MRX...JKL...FFC...ILN...LMK...OHX...
BMX...HUN...PAH...
LAT...LON 37248706 37928613 38588381 38018267 37028234 35678301
34928422 34178548 34118708 34268796 35688696 37248706SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 1:18 PM CDT | Severe Thunderstorm Watch | SPC | Colbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 7 more | 7 hr |
| May 22, 1:51 PM CDT | Mesoscale Discussion | SPC | Boone, Boyd, Bracken, Campbell, Carroll, Carter and 8 more | 54 min |
| May 22, 3:44 PM CDT | Mesoscale Discussion | SPC | Bath, Bell, Bourbon, Boyd, Bracken, Breathitt and 44 more | 61 min |
| May 22, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | Boyd, Carter, Greenup, Lawrence | 5 hr |
| May 22, 6:26 PM CDT | Mesoscale Discussion | SPC | Boyd, Carter, Elliott, Floyd, Greenup, Johnson and 4 more | 2 hr |
| May 22, 5:18 AM CDT | Mesoscale Discussion | SPC | Crockett, Dyer, Fayette, Hardeman, Haywood, Lake and 3 more | 57 min |
| May 22, 7:03 AM CDT | Severe Thunderstorm Watch | SPC | Chester, Crockett, Decatur, Fayette, Hardeman, Hardin and 7 more | 7 hr |
| May 22, 1:09 PM CDT | Mesoscale Discussion | SPC | Chester, Fayette, Hardeman, Hardin, Haywood, McNairy and 3 more | 66 min |
Nearby
Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Alabama, 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.