Alert archive / Kentucky / Mesoscale Discussions in 2010

Mesoscale Discussion 652

May 21, 201017 counties in Indiana; 27 counties in Kentucky; Brown County, Clermont County, Ohio

The Storm Prediction Center issued this mesoscale discussion at May 21, 2010, 5:29 PM EDT for 17 counties in Indiana; 27 counties in Kentucky; Brown County, Clermont County, Ohio. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: May 21, 2010, 5:29 PM EDT (21:29 UTC)
Expired: May 21, 2010, 6:00 PM EDT
In force: 31 min
Issued by: the Storm Prediction Center

All 46 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Martin County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Spencer County, IN, Switzerland County, IN, Warrick County, IN, Washington County, IN, Anderson County, KY, Boone County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Daviess County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Kenton County, KY, Meade 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, Trimble County, KY, Brown County, OH, Clermont County, OH

The radar

The Louisville radar (KLVX), 54 km from the middle of the area, began a volume at 21:32 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, 9.5 hours before the alert went out and 198 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: 263 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 21, 11:26 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 78 more	64 min
May 21, 1:33 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 60 more	7 hr
May 21, 4:08 PM EDT	Mesoscale Discussion	SPC	Allen, Bartholomew, Blackford, Boone, Brown, Carroll and 49 more	67 min
May 21, 7:41 PM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Floyd, Harrison, Perry, Switzerland	64 min

Nearby

Mesoscale Discussions in Kentucky, 2010 Mesoscale Discussions in Indiana, 2010 Mesoscale Discussions in Ohio, 2010 Every mesoscale discussion in 2010

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.