Alert archive / Kentucky / Mesoscale Discussions in 2017

Mesoscale Discussion 794

May 19, 201722 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 10:18 PM EDT for 22 counties in Kentucky. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: May 19, 2017, 10:18 PM EDT (02:18 UTC)
Expired: May 19, 2017, 11:45 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 22 counties

Breathitt County, KY, Clay County, KY, Floyd County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lincoln County, KY, Magoffin County, KY, Martin County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Whitley County, KY, Wolfe County, KY

The radar

The Jackson,KY radar (KJKL), 48 km from the middle of the area, began a volume at 02:20 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, 2.3 hours before the alert went out and 234 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
May 20, 2:45 AM EDT	Mesoscale Discussion	SPC	Ballard	90 min
May 20, 12:13 PM EDT	Mesoscale Discussion	SPC	Boone, Breckinridge, Bullitt, Butler, Caldwell, Calloway and 35 more	92 min
May 20, 4:23 PM EDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more	7 hr
May 20, 6:42 PM EDT	Mesoscale Discussion	SPC	Boone, Breckinridge, Bullitt, Butler, Caldwell, Calloway and 35 more	2 hr

Nearby

Mesoscale Discussions in Kentucky, 2017 Every 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.