Alert archive / Kentucky / Mesoscale Discussions in 2017

Mesoscale Discussion 590

April 29, 201712 counties in Indiana; 34 counties in Kentucky; 4 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2017, 7:23 AM EDT for 12 counties in Indiana; 34 counties in Kentucky; 4 counties in Ohio. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2017, 7:23 AM EDT (11:23 UTC)
Expired
Apr 29, 2017, 10:30 AM EDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 50 counties

Clark County, IN, Dearborn County, IN, Floyd County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Ohio County, IN, Ripley County, IN, Scott County, IN, Switzerland County, IN, Washington County, IN, Anderson County, KY, Boone County, KY, Bourbon County, KY, Bracken County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Clark County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Mason County, KY, Meade County, KY, Mercer County, KY, Montgomery County, KY, Nelson County, KY, Nicholas County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson 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, Clermont County, OH, Hamilton County, OH

The radar

The Louisville radar (KLVX), 69 km from the middle of the area, began a volume at 11:25 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.4 hours before the alert went out and 179 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 2017-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2017-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 419 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1645 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
419 m²/s²
0-3 km storm-relative helicity
848 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 28, 8:10 PM EDTSevere Thunderstorm WatchSPCBartholomew, Brown, Dearborn, Decatur, Fayette, Franklin and 8 more6 hr
Apr 28, 9:27 PM EDTTornado WatchSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 10 more5 hr
Apr 28, 11:19 PM EDTMesoscale DiscussionSPCClark, Crawford, Daviess, Dearborn, Dubois, Floyd and 18 more116 min
Apr 29, 1:50 AM EDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 11 more85 min
Apr 29, 4:28 PM EDTMesoscale DiscussionSPCDaviess, Gibson, Greene, Knox, Pike, Posey and 3 more2 hr
Apr 29, 7:30 PM EDTMesoscale DiscussionSPCBartholomew, Brown, Clay, Daviess, Dubois, Gibson and 23 more60 min
Apr 29, 12:55 AM EDTMesoscale DiscussionSPCBallard, Carlisle, Crittenden, Fulton, Graves, Hickman and 4 more95 min
Apr 29, 4:57 PM EDTSevere Thunderstorm WatchSPCBallard, McCracken6 hr

Nearby

Mesoscale Discussions in Kentucky, 2017Mesoscale Discussions in Indiana, 2017Mesoscale Discussions in Ohio, 2017Every mesoscale discussion in 2017

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.