Alert archive / Ohio / Mesoscale Discussions in 2013

Mesoscale Discussion 1449

July 20, 2013Dearborn County, Ohio County, Indiana; 8 counties in Kentucky; 15 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2013, 3:19 PM EDT for Dearborn County, Ohio County, Indiana; 8 counties in Kentucky; 15 counties in Ohio. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jul 20, 2013, 3:19 PM EDT (19:19 UTC)
Expired: Jul 20, 2013, 4:45 PM EDT
In force: 86 min
Issued by: the Storm Prediction Center

All 25 counties

Dearborn County, IN, Ohio County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Greenup County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Pendleton County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Clermont County, OH, Clinton County, OH, Gallia County, OH, Hamilton County, OH, Highland County, OH, Jackson County, OH, Lawrence County, OH, Montgomery County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 31 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 32 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: 1768 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 683 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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
Jul 20, 11:47 AM EDT	Mesoscale Discussion	SPC	Dearborn, Fayette, Franklin, Ohio, Union, Wayne	118 min
Jul 20, 1:07 PM EDT	Severe Thunderstorm Watch	SPC	Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more	8 hr

Nearby

Mesoscale Discussions in Ohio, 2013 Mesoscale Discussions in Kentucky, 2013 Mesoscale Discussions in Indiana, 2013 Every mesoscale discussion in 2013

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.