Alert archive / Ohio / Mesoscale Discussions in 2017

Mesoscale Discussion 1514

August 17, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2017, 12:04 PM EDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Aug 17, 2017, 12:04 PM EDT (16:04 UTC)
Expired: Aug 17, 2017, 2:00 PM EDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 66 counties

Adams County, IN, Allen County, IN, Bartholomew County, IN, Blackford County, IN, Dearborn County, IN, Decatur County, IN, DeKalb County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Hancock County, IN, Henry County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Ohio County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Steuben County, IN, Switzerland County, IN, Union County, IN, Wayne County, IN, Wells County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Hillsdale County, MI, Lenawee County, MI, Monroe County, MI, Allen County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Defiance County, OH, Fulton County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Lucas County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Ottawa County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Warren County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Northern Indiana radar (KIWX), 114 km from the middle of the area, began a volume at 16:06 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 12:00Z, 4.1 hours before the alert went out and 193 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: 735 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 837 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

<!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
Aug 17, 3:33 PM EDT	Mesoscale Discussion	SPC	Boone, Bracken, Campbell, Gallatin, Greenup, Kenton and 3 more	57 min
Aug 17, 7:20 PM EDT	Mesoscale Discussion	SPC	Alcona, Alpena, Arenac, Bay, Cheboygan, Genesee and 13 more	115 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.