Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 1508
The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2012, 7:17 PM EDT for 6 states. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2012, 7:17 PM EDT (23:17 UTC)
- Expired
- Jul 19, 2012, 8:45 PM EDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 115 counties
Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Martin County, IN, Orange County, IN, Perry County, IN, Washington County, IN, 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, Breckinridge 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, Floyd County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harlan County, KY, Hart County, KY, Henry County, KY, Jackson County, KY, Jefferson County, KY, Jessamine County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lawrence 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, Martin County, KY, McCreary County, KY, Meade County, KY, Menifee County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Morgan County, KY, Nelson County, KY, Ohio County, KY, Oldham 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, Warren County, KY, Washington County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Woodford County, KY, Alleghany County, NC, Claiborne County, TN, Clay County, TN, Hancock County, TN, Pickett County, TN, Sullivan County, TN, Bland County, VA, Buchanan County, VA, City of Bristol, VA, City of Galax, VA, City of Norton, VA, Dickenson County, VA, Grayson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Wythe County, VA, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV
The radar
The Jackson,KY radar (KJKL), 100 km from the middle of the area, began a volume at 23:19 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
Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.3 hours before the alert went out and 205 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
- 922 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
386 ACUS11 KWNS 192317 SWOMCD SPC MCD 192317 WVZ000-NCZ000-VAZ000-TNZ000-KYZ000-INZ000-200045- MESOSCALE DISCUSSION 1508 NWS STORM PREDICTION CENTER NORMAN OK 0617 PM CDT THU JUL 19 2012 AREAS AFFECTED...SRN IND...CNTRL/ERN KY...FAR SRN WV...WRN VA CONCERNING...SEVERE THUNDERSTORM WATCH 495... VALID 192317Z - 200045Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 495 CONTINUES. SUMMARY...SEVERE THREAT WILL CONTINUE MAINLY ACROSS WRN HALF OF WW 495 THE NEXT FEW HOURS. STRONG TO LOCALLY SEVERE WINDS ARE POSSIBLE. STORMS HAVE WEAKENED FURTHER E AND THE WW MAY BE CANCELED NORTH OF ANY ONGOING CONVECTION. DISCUSSION...CONVECTION HAS RECENTLY INTENSIFIED FROM NEAR THE LOUISVILLE METRO AREA SWWD INTO AN AXIS OF GREATER INSTABILITY AHEAD OF SEWD ADVANCING COLD FRONT. THE WW HAS BEEN EXPANDED SWD TO THE TN BORDER IN THIS AREA. WEAK DEEP LAYER FLOW AND MARGINAL MIDLEVEL LAPSE RATES SHOULD LIMIT SEVERE THREAT FROM STORMS DEVELOPING IN STRONGER INSTABILITY ACROSS SWRN PORTIONS OF THE LOUISVILLE CWA. THE CONVECTION IMPACTING THE LOUISVILLE AREA MAY POSE A GREATER THREAT AS IT HAS ORGANIZED INTO A LINEAR STRUCTURE AND ANY DEVELOPING COLD POOL WOULD HELP MAINTAIN STORMS AND AID IN STRONG/SEVERE WIND PRODUCTION. BULK OF STORMS/SEVERE THREAT HAS DIMINISHED ACROSS ERN PORTIONS OF THE WATCH AREA AND COUNTIES MAY BE DROPPED BY LOCAL WFO/S NORTH OF ONGOING CONVECTION. ..LEITMAN.. 07/19/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...RNK...RLX...MRX...JKL...ILN...LMK...OHX...IND... PAH... LAT...LON 38778686 37748074 36438074 36588702 38778686
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 8:43 PM EDT | Severe Thunderstorm Watch | SPC | Jasper, Lake, Newton, Porter | 5 hr |
| Jul 18, 11:30 PM EDT | Mesoscale Discussion | SPC | Carroll, Cass, Clinton, Elkhart, Fulton, Grant and 20 more | 60 min |
| Jul 19, 3:27 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Benton, Boone, Brown, Carroll, Clay and 25 more | 93 min |
| Jul 19, 3:40 PM EDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 7 hr |
| Jul 19, 4:11 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Carroll and 53 more | 7 hr |
| Jul 19, 2:20 PM EDT | Mesoscale Discussion | SPC | Breathitt, Floyd, Harlan, Johnson, Knott, Leslie and 5 more | 85 min |
| Jul 19, 7:42 PM EDT | Mesoscale Discussion | SPC | Anderson, Bedford, Benton, Bledsoe, Campbell, Cannon and 39 more | 93 min |
| Jul 19, 6:53 PM EDT | Mesoscale Discussion | SPC | Berkeley, Jefferson, Morgan | 97 min |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Virginia, 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.