Alert archive / West Virginia / Mesoscale Discussions in 2017

Mesoscale Discussion 1256

July 7, 201717 counties in Ohio; 28 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2017, 1:07 PM EDT for 17 counties in Ohio; 28 counties in West Virginia. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jul 7, 2017, 1:07 PM EDT (17:07 UTC)
Expired
Jul 7, 2017, 2:00 PM EDT
In force
53 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 45 counties

Athens County, OH, Belmont County, OH, Gallia County, OH, Guernsey County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pike County, OH, Scioto County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, Nicholas County, WV, Pleasants County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wetzel County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 52 km from the middle of the area, began a volume at 17:12 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, 5.1 hours before the alert went out and 196 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2017-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 678 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2017-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 171 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
678 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
863 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
171 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.8

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.

IssuedProductOfficeCountiesLasted
Jul 7, 8:02 AM EDTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Coshocton, Geauga, Guernsey and 11 more2 hr
Jul 7, 8:51 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Darke, Defiance, Mercer, Paulding and 3 more114 min
Jul 7, 9:46 AM EDTSevere Thunderstorm WatchSPCAllen, Auglaize, Champaign, Clark, Crawford, Darke and 32 more7 hr
Jul 7, 11:22 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Butler, Champaign, Clark, Clinton and 30 more53 min
Jul 7, 1:27 PM EDTSevere Thunderstorm WatchSPCAthens, Belmont, Carroll, Coshocton, Gallia, Guernsey and 13 more8 hr
Jul 7, 3:35 PM EDTMesoscale DiscussionSPCAthens, Belmont, Gallia, Meigs, Monroe, Morgan and 3 more85 min
Jul 7, 3:54 PM EDTMesoscale DiscussionSPCAdams, Brown, Butler, Clermont, Clinton, Greene and 7 more96 min
Jul 7, 4:24 PM EDTSevere Thunderstorm WatchSPCAdams, Brown, Butler, Clermont, Clinton, Fayette and 9 more7 hr
Jul 7, 6:34 PM EDTMesoscale DiscussionSPCAdams, Gallia, Jackson, Lawrence, Scioto86 min

Nearby

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