Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 480

April 19, 20116 counties in Indiana; 41 counties in Kentucky; 15 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2011, 9:47 PM EDT for 6 counties in Indiana; 41 counties in Kentucky; 15 counties in Ohio. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Apr 19, 2011, 9:47 PM EDT (01:47 UTC)
Expired
Apr 19, 2011, 11:15 PM EDT
In force
88 min
Issued by
the Storm Prediction Center
All 62 counties

Clark County, IN, Dearborn County, IN, Floyd County, IN, Jefferson County, IN, Ohio County, IN, Switzerland County, IN, Adair County, KY, Anderson County, KY, Barren County, KY, Boone County, KY, Boyle County, KY, Bracken County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Kenton County, KY, Larue County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Nelson County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Warren County, OH

The radar

The Louisville radar (KLVX), 76 km from the middle of the area, began a volume at 01:48 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 00:00Z, 1.8 hours before the alert went out and 173 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.

Skew-T log-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2011-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1686 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2011-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 387 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1686 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1003 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
387 m²/s²
0-3 km storm-relative helicity
474 m²/s²
Significant tornado parameter
4.3
Supercell composite
18.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 19, 9:07 PM EDTMesoscale DiscussionSPCBlackford, Boone, Carroll, Cass, Clay, Clinton and 39 more83 min
Apr 19, 9:37 PM EDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more3 hr
Apr 19, 10:13 PM EDTTornado WatchSPCClark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more6 hr
Apr 20, 12:56 AM EDTMesoscale DiscussionSPCClark, Dearborn, Franklin, Jefferson, Ohio, Ripley and 1 more94 min
Apr 20, 1:59 AM EDTTornado WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 31 more5 hr
Apr 20, 3:20 AM EDTMesoscale DiscussionSPCBell, Boyd, Breathitt, Clay, Clinton, Cumberland and 23 more85 min
Apr 19, 11:47 PM EDTMesoscale DiscussionSPCAshland, Carroll, Crawford, Fulton, Hancock, Henry and 14 more58 min
Apr 20, 12:18 AM EDTSevere Thunderstorm WatchSPCAshland, Ashtabula, Crawford, Erie, Geauga, Hancock and 21 more4 hr
Apr 20, 2:22 AM EDTSevere Thunderstorm WatchSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more3 hr

Nearby

Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Indiana, 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.