Alert archive / Ohio / Mesoscale Discussions in 2015

Mesoscale Discussion 985

June 12, 201546 counties in Ohio; 4 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2015, 12:52 PM EDT for 46 counties in Ohio; 4 counties in Pennsylvania. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2015, 12:52 PM EDT (16:52 UTC)
Expired: Jun 12, 2015, 2:45 PM EDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 50 counties

Allen County, OH, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Erie County, OH, Franklin County, OH, Geauga County, OH, Greene County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Miami County, OH, Morrow County, OH, Ottawa County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH, Beaver County, PA, Crawford County, PA, Lawrence County, PA, Mercer County, PA

The radar

The Cleveland radar (KCLE), 91 km from the middle of the area, began a volume at 16:53 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, 4.9 hours before the alert went out and 189 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: 38 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1338 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -110 m²/s²
0-3 km storm-relative helicity: -97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	Ashland, Ashtabula, Auglaize, Belmont, Butler, Carroll and 59 more	8 hr
Jun 12, 4:21 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Carroll, Columbiana, Guernsey, Harrison and 9 more	84 min
Jun 12, 4:32 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Paulding, Putnam, Van Wert	4 hr
Jun 12, 6:53 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Athens, Auglaize, Belmont, Butler and 47 more	97 min
Jun 12, 2:03 PM EDT	Mesoscale Discussion	SPC	Adams, Carbon, Columbia, Cumberland, Dauphin, Franklin and 14 more	87 min
Jun 12, 2:54 PM EDT	Severe Thunderstorm Watch	SPC	McKean, Potter, Tioga, Warren	6 hr
Jun 12, 7:25 PM EDT	Severe Thunderstorm Watch	SPC	Bedford, Blair, Bradford, Cambria, Centre, Columbia and 17 more	4 hr

Nearby

Mesoscale Discussions in Ohio, 2015 Mesoscale Discussions in Pennsylvania, 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.