Alert archive / Ohio / Mesoscale Discussions in 2014

Mesoscale Discussion 1584

August 20, 20146 counties in Kentucky; 14 counties in Ohio; 5 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 20, 2014, 3:15 AM EDT for 6 counties in Kentucky; 14 counties in Ohio; 5 counties in West Virginia. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Aug 20, 2014, 3:15 AM EDT (07:15 UTC)
Expired: Aug 20, 2014, 4:45 AM EDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 25 counties

Boyd County, KY, Carter County, KY, Fleming County, KY, Greenup County, KY, Lewis County, KY, Mason County, KY, Adams County, OH, Athens County, OH, Gallia County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Morgan County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Vinton County, OH, Washington County, OH, Cabell County, WV, Jackson County, WV, Mason County, WV, Putnam County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 109 km from the middle of the area, began a volume at 07:17 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, 7.3 hours before the alert went out and 111 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: 917 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1411 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 48 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
Aug 20, 3:15 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Barren, Bell, Boyle, Butler and 33 more	60 min
Aug 20, 3:59 PM EDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 49 more	5 hr
Aug 20, 6:32 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bath, Bell and 67 more	118 min

Nearby

Mesoscale Discussions in Ohio, 2014 Mesoscale Discussions in Kentucky, 2014 Mesoscale Discussions in West Virginia, 2014 Every mesoscale discussion in 2014

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.