Alert archive / Kentucky / Mesoscale Discussions in 2020

Mesoscale Discussion 175

March 12, 202012 counties in Kentucky; Pickett County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2020, 6:20 PM CDT for 12 counties in Kentucky; Pickett County, Tennessee. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Mar 12, 2020, 6:20 PM CDT (23:20 UTC)
Expired: Mar 12, 2020, 7:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Adair County, KY, Barren County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Green County, KY, Hart County, KY, Metcalfe County, KY, Monroe County, KY, Russell County, KY, Warren County, KY, Wayne County, KY, Pickett County, TN

The radar

The Louisville radar (KLVX), 105 km from the middle of the area, began a volume at 23:24 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

Nashville Metro, TN (KBNA), launched 12:00Z, 11.3 hours before the alert went out and 135 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: 662 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 182 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
Mar 12, 11:13 AM CDT	Mesoscale Discussion	SPC	Ballard, Butler, Caldwell, Calloway, Carlisle, Christian and 24 more	2 hr
Mar 12, 11:44 AM CDT	Tornado Watch	SPC	Allen, Ballard, Barren, Breckinridge, Butler, Caldwell and 30 more	6 hr
Mar 12, 1:28 PM CDT	Mesoscale Discussion	SPC	Ballard, Crittenden, Livingston, Lyon, McCracken, Union and 1 more	2 hr
Mar 12, 2:31 PM CDT	Mesoscale Discussion	SPC	Ballard, Fulton	89 min
Mar 12, 3:20 PM CDT	Mesoscale Discussion	SPC	Caldwell, Christian, Crittenden, Hopkins, Livingston, Lyon and 2 more	85 min
Mar 12, 3:44 PM CDT	Tornado Watch	SPC	Ballard, Carlisle, Fulton, Graves, Hickman, McCracken	7 hr
Mar 12, 5:09 PM CDT	Tornado Watch	SPC	Adair, Allen, Barren, Boyle, Breckinridge, Bullitt and 30 more	5 hr
Mar 12, 5:51 PM CDT	Mesoscale Discussion	SPC	Dyer, Lake, Obion	84 min

Nearby

Mesoscale Discussions in Kentucky, 2020 Mesoscale Discussions in Tennessee, 2020 Every mesoscale discussion in 2020

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.