Alert archive / Kentucky / Mesoscale Discussions in 2011
Mesoscale Discussion 534
The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2011, 11:51 AM EDT for 30 counties in Indiana; 49 counties in Kentucky; 14 counties in Ohio. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2011, 11:51 AM EDT (15:51 UTC)
- Expired
- Apr 23, 2011, 1:15 PM EDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 93 counties
Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Switzerland County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Anderson County, KY, Bath County, KY, Boone County, KY, Bourbon County, KY, Boyd County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Carter County, KY, Clark County, KY, Daviess County, KY, Elliott County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Greenup County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Lawrence County, KY, Lewis County, KY, Mason County, KY, Meade County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Morgan County, KY, Nelson County, KY, Nicholas County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Powell County, KY, Robertson County, KY, Rowan County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY, Woodford County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Hamilton County, OH, Highland County, OH, Jackson County, OH, Lawrence County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Vinton County, OH, Warren County, OH
The radar
The Louisville radar (KLVX), 89 km from the middle of the area, began a volume at 15:54 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, 3.9 hours before the alert went out and 158 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
- 25 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 544 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 405 m²/s²
- 0-3 km storm-relative helicity
- 323 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
168
ACUS11 KWNS 231551
SWOMCD
SPC MCD 231551
WVZ000-OHZ000-KYZ000-INZ000-231715-
MESOSCALE DISCUSSION 0534
NWS STORM PREDICTION CENTER NORMAN OK
1051 AM CDT SAT APR 23 2011
AREAS AFFECTED...SRN IN...NRN KY...SRN OH...SWRN WV
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 231551Z - 231715Z
THUNDERSTORMS WILL SLOWLY INCREASE IN NUMBER AND INTENSITY THROUGH
EARLY AFTERNOON. PULSE SEVERE STORMS ARE EXPECTED WITH LARGE
HAIL...GUSTY WINDS AND TRAINING HEAVY RAINFALL. PROBABILITY OF A
SEVERE THUNDERSTORM WATCH ISSUANCE IS 40 PERCENT THROUGH EARLY
AFTERNOON.
OUTFLOW FROM OVERNIGHT STORMS HAS SETTLED JUST SOUTH OF THE OH RIVER
IN SRN IND/NRN KY. BROAD...PERSIST AND MOIST WSWLY LOW-LEVEL FLOW
REGIME IMPINGING ON THIS BOUNDARY WAS AIDING IN THE GENERATION OF
THUNDERSTORMS LATE THIS MORNING. INSPECTION OF 12Z SOUNDINGS
SUGGEST THAT THE VERY STEEP LAPSE RATE PLUME HAS ADVECTED QUITE FAR
E SOUTH OF THE BAROCLINIC ZONE AND VIGOROUS UPDRAFTS WILL YIELD
LARGE HAIL. MOREOVER...MODEST UNIDIRECTIONAL WSWLY FLOW REGIME
ABOVE 1KM AT SPEEDS REACHING 55 KTS AT 6KM WILL BE FAVORABLE FOR
OCCASIONAL BOWING STORM STRUCTURES GIVING DAMAGING WINDS AND PERHAPS
A BRIEF TORNADO.
WHILE THERE IS A HIGHER PROBABILITY FOR STRONGER STORMS TO FAVOR
LOCALES ALONG/S OF THE AFOREMENTIONED OUTFLOW BOUNDARY...STORMS
COULD ALSO DEVELOP WHERE INSOLATION HAS OCCURRED BETWEEN THE OUTFLOW
AND PRIMARY COLD FRONT N OF THE OH RIVER. TRAINING...VERY HEAVY
RAINFALL WILL LIKELY OCCUR ALONG/JUST N OF THE OH RIVER FROM NEAR
EVV NEWD TO NEAR/S OF KCVG THROUGH 18Z.
..RACY.. 04/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...RLX...JKL...ILN...LMK...IND...PAH...
LAT...LON 39178705 39538468 39258234 38198239 37838312 37678537
37578677 38078780 39178705SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 8:31 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 35 more | 59 min |
| Apr 22, 10:20 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 9 more | 55 min |
| Apr 23, 2:04 AM EDT | Tornado Watch | SPC | Clark, Crawford, Dearborn, Dubois, Floyd, Gibson and 14 more | 4 hr |
| Apr 23, 4:41 AM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 8 more | 94 min |
| Apr 23, 3:30 PM EDT | Tornado Watch | SPC | Floyd, Harrison | 5 hr |
| Apr 23, 5:22 AM EDT | Mesoscale Discussion | SPC | Anderson, Boyle, Breckinridge, Bullitt, Butler, Caldwell and 24 more | 23 min |
| Apr 23, 2:04 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 17 more | 86 min |
| Apr 23, 3:56 PM EDT | Mesoscale Discussion | SPC | Bath, Bourbon, Boyd, Bracken, Carter, Clark and 14 more | 64 min |
| Apr 23, 4:39 PM EDT | Severe Thunderstorm Watch | SPC | Boyd, Carter, Greenup, Lawrence | 4 hr |
| Apr 23, 6:09 PM EDT | Mesoscale Discussion | SPC | Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 11 more | 2 hr |
| Apr 23, 6:38 PM EDT | Severe Thunderstorm Watch | SPC | Ballard, Carlisle, Fulton, Hickman | 6 hr |
| Apr 23, 7:35 PM EDT | Mesoscale Discussion | SPC | Adair, Anderson, Barren, Bath, Bourbon, Boyle and 37 more | 55 min |
Nearby
Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Ohio, 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.