Alert archive / Kentucky / Mesoscale Discussions in 2015

Mesoscale Discussion 463

April 25, 20159 counties in Kentucky; 5 counties in Virginia; McDowell County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2015, 10:19 PM EDT for 9 counties in Kentucky; 5 counties in Virginia; McDowell County, West Virginia. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2015, 10:19 PM EDT (02:19 UTC)
Expired: Apr 25, 2015, 11:45 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Breathitt County, KY, Floyd County, KY, Knott County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Buchanan County, VA, Dickenson County, VA, Russell County, VA, Smyth County, VA, Tazewell County, VA, McDowell County, WV

The radar

The Jackson,KY radar (KJKL), 71 km from the middle of the area, began a volume at 02:21 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 263 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 199 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
Apr 25, 9:45 PM EDT	Severe Thunderstorm Watch	SPC	Lee, Russell, Scott, Washington, Wise, City of Bristol and 1 more	4 hr

Nearby

Mesoscale Discussions in Kentucky, 2015 Mesoscale Discussions in Virginia, 2015 Mesoscale Discussions in West Virginia, 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.