Alert archive / Ohio / Mesoscale Discussions in 2015

Mesoscale Discussion 255

April 9, 201520 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 5:36 PM EDT for 20 counties in Ohio. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 9, 2015, 5:36 PM EDT (21:36 UTC)
Expired: Apr 9, 2015, 7:30 PM EDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Ashland County, OH, Crawford County, OH, Erie County, OH, Hancock County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lorain County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Portage County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cleveland radar (KCLE), 59 km from the middle of the area, began a volume at 21:40 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

Detroit, MI (KDTX), launched 12:00Z, 9.6 hours before the alert went out and 204 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: 734 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 179 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 9, 1:51 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Brown, Butler, Clark, Clermont and 22 more	54 min
Apr 9, 2:26 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Athens, Belmont, Brown, Butler, Champaign and 32 more	8 hr
Apr 9, 4:01 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Brown, Clermont, Clinton and 16 more	59 min
Apr 9, 4:29 PM EDT	Severe Thunderstorm Watch	SPC	Belmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 5 more	6 hr
Apr 9, 4:49 PM EDT	Mesoscale Discussion	SPC	Brown, Butler, Clark, Clermont, Clinton, Fayette and 7 more	56 min

Nearby

Mesoscale Discussions in Ohio, 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.