Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 523

April 20, 200310 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Apr 20, 2003, 7:53 PM EDT for 10 counties in Ohio. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 20, 2003, 7:53 PM EDT (23:53 UTC)
Expired: Apr 20, 2003, 9:00 PM EDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Ashland County, OH, Coshocton County, OH, Delaware County, OH, Holmes County, OH, Knox County, OH, Licking County, OH, Morrow County, OH, Richland County, OH, Tuscarawas County, OH, Wayne County, OH

The radar

The Cleveland radar (KCLE), 116 km from the middle of the area, began a volume at 23:53 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.9 hours before the alert went out and 178 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: 54 J/kg
Mixed-layer CIN: -227 J/kg
Mixed-layer LCL: 1119 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -56 m²/s²
0-3 km storm-relative helicity: -84 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.

<!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
Apr 20, 1:20 PM EDT	Severe Thunderstorm Watch	SPC	Defiance, Paulding, Van Wert, Williams	6 hr
Apr 20, 4:15 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Ashland, Auglaize, Brown, Butler and 56 more	6 hr
Apr 20, 6:31 PM EDT	Mesoscale Discussion	SPC	Adams, Ashland, Brown, Butler, Champaign, Clark and 31 more	89 min

Nearby

Mesoscale Discussions in Ohio, 2003 Every mesoscale discussion in 2003

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.