Alert archive / Indiana / Mesoscale Discussions in 2016

Mesoscale Discussion 1820

November 18, 201618 counties in Indiana; 10 counties in Michigan; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Nov 18, 2016, 6:31 PM EST for 18 counties in Indiana; 10 counties in Michigan; 5 counties in Ohio. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Nov 18, 2016, 6:31 PM EST (23:31 UTC)
Expired: Nov 18, 2016, 7:30 PM EST
In force: 59 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 33 counties

Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Delaware County, IN, Grant County, IN, Hancock County, IN, Henry County, IN, Huntington County, IN, Jay County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Steuben County, IN, Wells County, IN, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Lenawee County, MI, Livingston County, MI, Washtenaw County, MI, Defiance County, OH, Fulton County, OH, Paulding County, OH, Van Wert County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 48 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 213 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1801 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 307 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Nov 18, 2:19 PM EST	Mesoscale Discussion	SPC	Benton, Carroll, Cass, Clay, Clinton, Fountain and 18 more	116 min

Nearby

Mesoscale Discussions in Indiana, 2016 Mesoscale Discussions in Michigan, 2016 Mesoscale Discussions in Ohio, 2016 Every mesoscale discussion in 2016

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.