Alert archive / Indiana / Mesoscale Discussions in 2013

Mesoscale Discussion 500

April 17, 201318 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2013, 5:39 PM EDT for 18 counties in Indiana. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 17, 2013, 5:39 PM EDT (21:39 UTC)
Expired: Apr 17, 2013, 7:15 PM EDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Bartholomew County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Dubois County, IN, Greene County, IN, Jackson County, IN, Johnson County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Pike County, IN, Putnam County, IN, Washington County, IN

The radar

The Indianapolis radar (KIND), 63 km from the middle of the area, began a volume at 21:41 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

Lincoln, IL (KILX), launched 12:00Z, 9.7 hours before the alert went out and 215 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: 540 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.8

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 16, 9:02 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Clark, Crawford, Daviess, Dearborn, Decatur and 23 more	88 min
Apr 16, 9:44 PM EDT	Mesoscale Discussion	SPC	Boone, Clay, Fountain, Greene, Hendricks, Knox and 9 more	2 hr
Apr 17, 10:30 AM EDT	Mesoscale Discussion	SPC	Perry, Spencer, Vanderburgh, Warrick	2 hr
Apr 17, 4:04 PM EDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Clay, Clinton, Fountain and 13 more	56 min
Apr 17, 4:33 PM EDT	Tornado Watch	SPC	Benton, Boone, Carroll, Cass, Clinton, Fountain and 16 more	8 hr
Apr 17, 4:53 PM EDT	Mesoscale Discussion	SPC	Crawford, Harrison, Perry, Spencer, Warrick	67 min
Apr 17, 7:46 PM EDT	Mesoscale Discussion	SPC	Benton, Boone, Carroll, Cass, Clinton, Fountain and 16 more	89 min

Nearby

Mesoscale Discussions in Indiana, 2013 Every mesoscale discussion in 2013

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.