Alert archive / Ohio / Mesoscale Discussions in 2017

Mesoscale Discussion 580

April 28, 201741 counties in Indiana; 11 counties in Kentucky; 43 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2017, 6:48 PM EDT for 41 counties in Indiana; 11 counties in Kentucky; 43 counties in Ohio. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2017, 6:48 PM EDT (22:48 UTC)
Expired: Apr 28, 2017, 8:45 PM EDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 95 counties

Bartholomew County, IN, Boone County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Franklin County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Trimble County, KY, Adams County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 94 km from the middle of the area, began a volume at 22:50 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 10.8 hours before the alert went out and 96 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: 1025 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 175 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
Apr 28, 2:10 PM EDT	Mesoscale Discussion	SPC	Brown, Clay, Crawford, Daviess, Dubois, Floyd and 21 more	2 hr
Apr 28, 5:59 PM EDT	Mesoscale Discussion	SPC	Spencer	91 min
Apr 28, 7:28 PM EDT	Mesoscale Discussion	SPC	Posey	3 hr
Apr 28, 3:33 PM EDT	Mesoscale Discussion	SPC	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 44 more	87 min

Nearby

Mesoscale Discussions in Ohio, 2017 Mesoscale Discussions in Indiana, 2017 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.