Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 2038

August 18, 200446 counties in Ohio; 5 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2004, 6:01 PM EDT for 46 counties in Ohio; 5 counties in Pennsylvania. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 18, 2004, 6:01 PM EDT (22:01 UTC)
Expired: Aug 18, 2004, 7:30 PM EDT
In force: 89 min
Issued by: the Storm Prediction Center

All 51 counties

Adams County, OH, Ashland County, OH, Ashtabula County, OH, Athens County, OH, Carroll County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Cuyahoga County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Mahoning County, OH, Medina County, OH, Meigs County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Vinton County, OH, Wayne County, OH, Beaver County, PA, Crawford County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA

The radar

The Cleveland radar (KCLE), 95 km from the middle of the area, began a volume at 22:03 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

Detroit, MI (KDTX), launched 12:00Z, 10.0 hours before the alert went out and 281 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: 145 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 557 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 30 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
Aug 17, 8:48 PM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Crawford, Cuyahoga, Defiance, Erie and 24 more	117 min
Aug 18, 4:03 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Crawford, Cuyahoga and 22 more	57 min
Aug 18, 6:17 PM EDT	Mesoscale Discussion	SPC	Butler, Clermont, Hamilton, Preble	88 min
Aug 18, 1:24 PM EDT	Mesoscale Discussion	SPC	Bucks, Chester, Delaware, Lancaster, Lehigh, Montgomery and 2 more	96 min

Nearby

Mesoscale Discussions in Ohio, 2004 Mesoscale Discussions in Pennsylvania, 2004 Every mesoscale discussion in 2004

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.