Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 259
The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2012, 4:44 PM EDT for 4 states. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Mar 15, 2012, 4:44 PM EDT (20:44 UTC)
- Expired
- Mar 15, 2012, 5:45 PM EDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 135 counties
Bartholomew County, IN, Clark County, IN, Dearborn County, IN, Decatur County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Hancock County, IN, Harrison County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Ohio County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Wayne County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Boone County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breathitt County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jackson County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, McCreary County, KY, Meade County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Owsley County, KY, Pendleton County, KY, Perry County, KY, Powell County, KY, Pulaski County, KY, Robertson 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, Trimble County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Butler County, OH, Clermont County, OH, Hamilton County, OH, Preble County, OH, Cheatham County, TN, Chester County, TN, Clay County, TN, Davidson County, TN, Decatur County, TN, Dickson 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, Macon County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Perry County, TN, Pickett County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN
The radar
The Louisville radar (KLVX), 94 km from the middle of the area, began a volume at 20:47 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, 8.7 hours before the alert went out and 120 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.
503
ACUS11 KWNS 152045
SWOMCD
SPC MCD 152044
KYZ000-OHZ000-TNZ000-INZ000-152145-
MESOSCALE DISCUSSION 0259
NWS STORM PREDICTION CENTER NORMAN OK
0344 PM CDT THU MAR 15 2012
AREAS AFFECTED...TN/CNTRL OH VALLEYS
CONCERNING...SEVERE THUNDERSTORM WATCH 75...
VALID 152044Z - 152145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 75
CONTINUES.
OVERALL SEVERE THREAT MAY HAVE PEAKED WITH NUMEROUS TO WIDESPREAD
TSTMS EXTENDING ACROSS THE CNTRL OH TO THE TN VALLEYS.
STILL...MARGINAL SEVERE HAIL SHOULD PERSIST FOR THE NEXT FEW HOURS
WITH PERHAPS LOCALLY DAMAGING WINDS WITHIN EMBEDDED MULTICELL
CLUSTERS. THE NEED FOR A WW ISSUANCE TO THE N/E OF WW 75 IS UNCLEAR
ATTM.
NUMEROUS DISCRETE CELLS HAVE LARGELY CONGLOMERATED INTO TWO DISTINCT
BANDS...ONE MOVING NEWD ACROSS SRN IND INTO N-CNTRL KY AND THE OTHER
MOVING EWD ACROSS WRN KY/TN. MID-LEVEL REFLECTIVITY CORES WITHIN THE
WRN BAND HAVE BEEN RECENTLY DIMINISHING AS ACTIVITY HAS PROPAGATED
INTO AN OVERTURNED AIR MASS. THE LEAD/NERN BAND MAY STILL REMAIN
STRONG TO LOCALLY SEVERE FOR THE NEXT COUPLE OF HOURS BEFORE
ENCOUNTERING THE OVERTURNED AIR MASS FROM AN EARLIER MCS THAT PUSHED
ACROSS SWRN OH/ERN KY. GIVEN THE WEAKLY SHEARED ENVIRONMENT AND
CONVECTIVE MODE BEING DOMINATED BY MERGERS/STORM-SCALE
INTERACTIONS...THE THREAT FOR SEVERE HAIL SHOULD BECOME INCREASINGLY
MARGINAL INTO EARLY EVENING.
..GRAMS.. 03/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MRX...JKL...ILN...LMK...OHX...IND...PAH...MEG...
LAT...LON 35248894 35938809 36768723 37318695 38048660 38458614
39058616 39658622 39978586 40098484 39768450 38758393
37418309 37008310 36778335 36658457 36318552 35598649
35208720 35108755 35018801 35158831 35248894SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 2:08 PM EDT | Mesoscale Discussion | SPC | Brown, Clark, Crawford, Daviess, Dubois, Floyd and 20 more | 2 hr |
| Mar 15, 3:06 PM EDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 6 hr |
| Mar 15, 5:28 PM EDT | Severe Thunderstorm Watch | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 3 hr |
| Mar 15, 6:02 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 19 more | 2 hr |
| Mar 15, 7:23 PM EDT | Mesoscale Discussion | SPC | Bath, Bell, Bourbon, Bracken, Breathitt, Campbell and 36 more | 97 min |
| Mar 15, 3:19 AM EDT | Mesoscale Discussion | SPC | Allen, Ashland, Champaign, Clark, Coshocton, Crawford and 41 more | 86 min |
| Mar 15, 3:52 PM EDT | Mesoscale Discussion | SPC | Allen, Defiance, Fulton, Hancock, Henry, Lucas and 8 more | 83 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.