Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 1317

June 20, 20116 states

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 12:46 PM EDT for 6 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2011, 12:46 PM EDT (16:46 UTC)
Expired: Jun 20, 2011, 1:45 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 56 counties

Bath County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Elliott County, KY, Fleming County, KY, Floyd County, KY, Harlan County, KY, Johnson County, KY, Knott County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lewis County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Robertson County, KY, Rowan County, KY, Wolfe County, KY, Alexander County, NC, Ashe County, NC, Avery County, NC, Burke County, NC, Caldwell County, NC, Mitchell County, NC, Watauga County, NC, Yancey County, NC, Adams County, OH, Carter County, TN, Hawkins County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN, Washington County, TN, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Mingo County, WV, Wayne County, WV

The radar

The Jackson,KY radar (KJKL), 61 km from the middle of the area, began a volume at 16:47 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, 4.8 hours before the alert went out and 250 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: 146 J/kg
Mixed-layer CIN: -222 J/kg
Mixed-layer LCL: 1072 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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
Jun 20, 9:53 AM EDT	Mesoscale Discussion	SPC	Anderson, Bath, Bell, Boone, Bourbon, Boyle and 57 more	97 min
Jun 19, 9:07 PM EDT	Mesoscale Discussion	SPC	Cherokee, Clay, Graham, Haywood, Jackson, Macon and 1 more	53 min
Jun 19, 9:41 PM EDT	Severe Thunderstorm Watch	SPC	Buncombe, Cherokee, Clay, Graham, Haywood, Henderson and 5 more	5 hr
Jun 20, 2:36 PM EDT	Mesoscale Discussion	SPC	Alamance, Caswell, Orange	54 min

Nearby

Mesoscale Discussions in Kentucky, 2011 Mesoscale Discussions in Virginia, 2011 Mesoscale Discussions in North Carolina, 2011 Every mesoscale discussion in 2011

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.