Alert archive / Kentucky / Mesoscale Discussions in 2015

Mesoscale Discussion 253

April 9, 201511 counties in Indiana; 18 counties in Kentucky; 13 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 4:49 PM EDT for 11 counties in Indiana; 18 counties in Kentucky; 13 counties in Ohio. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Apr 9, 2015, 4:49 PM EDT (20:49 UTC)
Expired: Apr 9, 2015, 5:45 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 42 counties

Clark County, IN, Dearborn County, IN, Floyd County, IN, Franklin County, IN, Jefferson County, IN, Jennings County, IN, Ohio County, IN, Ripley County, IN, Scott County, IN, Switzerland County, IN, Union County, IN, Anderson County, KY, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Kenton County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Scott County, KY, Shelby County, KY, Trimble County, KY, Brown County, OH, Butler County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Madison County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 99 km from the middle of the area, began a volume at 20:52 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 12:00Z, 8.8 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 175 J/kg
Mixed-layer CIN: -175 J/kg
Mixed-layer LCL: 1204 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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.

Issued	Product	Office	Counties	Lasted
Apr 9, 1:51 PM EDT	Mesoscale Discussion	SPC	Dearborn	54 min
Apr 9, 2:26 PM EDT	Severe Thunderstorm Watch	SPC	Dearborn, Ohio, Ripley, Switzerland	8 hr
Apr 9, 2:48 PM EDT	Tornado Watch	SPC	Benton, Jasper, Lake, Newton, Porter	9 hr
Apr 9, 4:01 PM EDT	Mesoscale Discussion	SPC	Dearborn, Ohio, Ripley, Switzerland	59 min
Apr 9, 4:12 PM EDT	Mesoscale Discussion	SPC	Lake, Newton	93 min
Apr 9, 7:48 PM EDT	Tornado Watch	SPC	Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 31 more	6 hr
Apr 9, 4:45 PM EDT	Mesoscale Discussion	SPC	Ballard	60 min
Apr 9, 7:11 PM EDT	Mesoscale Discussion	SPC	Fulton	64 min
Apr 9, 4:29 PM EDT	Severe Thunderstorm Watch	SPC	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	6 hr
Apr 9, 5:36 PM EDT	Mesoscale Discussion	SPC	Ashland, Crawford, Erie, Hancock, Holmes, Huron and 14 more	114 min

Nearby

Mesoscale Discussions in Kentucky, 2015 Mesoscale Discussions in Ohio, 2015 Mesoscale Discussions in Indiana, 2015 Every mesoscale discussion in 2015

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.