Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 256
The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2012, 1:08 PM CDT for 7 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 15, 2012, 1:08 PM CDT (18:08 UTC)
- Expired
- Mar 15, 2012, 3:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 217 counties
Alexander County, IL, Clay County, IL, Crawford County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jasper County, IL, Johnson County, IL, Lawrence County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Ballard County, KY, Barren County, KY, Bell County, KY, Boyle County, KY, Breathitt County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Carroll County, KY, Casey County, KY, Christian County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Floyd County, KY, Franklin County, KY, Fulton County, KY, Garrard County, KY, Graves County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harlan County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hickman County, KY, Hopkins County, KY, Jackson County, KY, Jefferson County, KY, Jessamine 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, Livingston County, KY, Logan County, KY, Lyon County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, Marshall County, KY, McCracken County, KY, McCreary County, KY, McLean County, KY, Meade County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Trimble County, KY, Union County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Webster County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Mississippi County, MO, Scott County, MO, Madison County, NC, Anderson County, TN, Bedford County, TN, Benton County, TN, Bledsoe County, TN, Blount County, TN, Campbell County, TN, Cannon County, TN, Carter County, TN, Cheatham County, TN, Claiborne County, TN, Clay County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Macon County, TN, Maury County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Montgomery County, TN, Morgan County, TN, Obion County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Robertson County, TN, Rutherford County, TN, Scott County, TN, Sevier County, TN, Smith County, TN, Stewart County, TN, Sullivan County, TN, Sumner County, TN, Trousdale County, TN, Unicoi County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Washington County, TN, Weakley County, TN, White County, TN, Williamson County, TN, Wilson County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Washington County, VA, Wise County, VA
The radar
The Louisville radar (KLVX), 92 km from the middle of the area, began a volume at 18:10 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, 6.1 hours before the alert went out and 162 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
- 1726 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 820 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
549
ACUS11 KWNS 151809
SWOMCD
SPC MCD 151808
VAZ000-WVZ000-TNZ000-KYZ000-NCZ000-INZ000-ILZ000-MOZ000-152015-
MESOSCALE DISCUSSION 0256
NWS STORM PREDICTION CENTER NORMAN OK
0108 PM CDT THU MAR 15 2012
AREAS AFFECTED...TN/LOWER OH VALLEYS TOWARDS THE SRN APPALACHIANS
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 151808Z - 152015Z
PULSE TSTMS WITH A FEW MULTICELL CLUSTERS WILL BECOME INCREASINGLY
PREVALENT THIS AFTERNOON. GIVEN A STEEP LAPSE RATE BUT WEAKLY
SHEARED ENVIRONMENT...RISKS WILL PRIMARILY BE SPORADIC SEVERE HAIL
WITH LOCALLY GUSTY WINDS. THE DISORGANIZED NATURE OF THE TSTMS
SHOULD PRECLUDE THE NEED FOR A WW ISSUANCE.
CONVECTION HAS INCREASED IN BETWEEN TWO SLOW-MOVING TSTM CLUSTERS
THAT HAD PERSISTED FOR THE PAST SEVERAL HOURS ACROSS THE MID-MS AND
PARTS OF THE CNTRL OH VALLEY. VWP/UPSTREAM PROFILER DATA INDICATE
WEAK DEEP-LAYER FLOW WHICH HAS LIMITED EFFECTIVE SHEAR LARGELY TO
AROUND 10-20 KT. THIS SHOULD RESULT IN RATHER DISORGANIZED
STRUCTURES CONSISTING OF PULSE TO OCCASIONAL MULTICELL CONVECTIVE
MODES. WITH 700-500 MB LAPSE RATES OF 7.5 TO 8.0 DEG C/KM SAMPLED IN
12Z AREA RAOBS...MLCAPE OF 1500 TO 2500 J/KG WILL BE FAVORABLE FOR
SPORADIC SEVERE HAIL PRODUCTION UNTIL THE AIR MASS IS OVERTURNED.
..GRAMS.. 03/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RNK...RLX...GSP...MRX...JKL...ILN...LMK...OHX...
IND...PAH...ILX...MEG...LSX...
LAT...LON 37058966 38918855 39268717 39168560 38638481 38148416
37808312 37538204 37128162 37108164 36498182 35728285
35368456 35538720 36128868 36388932 37058966SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 5:02 PM CDT | Mesoscale Discussion | SPC | Brown, Cass, DeWitt, Ford, Fulton, Greene and 19 more | 2 hr |
| Mar 15, 2:06 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 6 hr |
| Mar 15, 3:44 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Clark, Dearborn, Decatur, Fayette, Floyd and 17 more | 61 min |
| Mar 15, 4:28 PM CDT | Severe Thunderstorm Watch | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 3 hr |
| Mar 15, 6:23 PM CDT | Mesoscale Discussion | SPC | Bath, Bell, Bourbon, Bracken, Breathitt, Campbell and 36 more | 97 min |
| Mar 15, 2:47 PM CDT | Mesoscale Discussion | SPC | Butler, Carter, Crawford, Dent, Douglas, Franklin and 22 more | 118 min |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Indiana, 2012Every mesoscale discussion in 2012
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.