Alert archive / West Virginia / Mesoscale Discussions in 2017

Mesoscale Discussion 1400

July 22, 201711 counties in Ohio; 16 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2017, 7:37 PM EDT for 11 counties in Ohio; 16 counties in West Virginia. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2017, 7:37 PM EDT (23:37 UTC)
Expired: Jul 22, 2017, 9:00 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 27 counties

Adams County, OH, Athens County, OH, Gallia County, OH, Highland County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Vinton County, OH, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Gilmer County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Mason County, WV, Nicholas County, WV, Putnam County, WV, Roane County, WV, Upshur County, WV, Webster County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 61 km from the middle of the area, began a volume at 23:37 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, 11.6 hours before the alert went out and 172 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: 809 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

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
Jul 22, 5:00 AM EDT	Mesoscale Discussion	SPC	Butler, Darke, Greene, Hamilton, Miami, Montgomery and 2 more	90 min
Jul 22, 8:34 AM EDT	Mesoscale Discussion	SPC	Belmont, Carroll, Columbiana, Harrison, Jefferson, Monroe and 2 more	86 min
Jul 22, 3:18 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Clinton, Fairfield, Fayette, Gallia and 17 more	2 hr
Jul 22, 3:54 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Fairfield, Fayette, Franklin, Gallia, Hocking and 11 more	6 hr

Nearby

Mesoscale Discussions in West Virginia, 2017 Mesoscale Discussions in Ohio, 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.