Alert archive / Michigan / Mesoscale Discussions in 2012

Mesoscale Discussion 1220

June 19, 201218 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2012, 10:00 AM EDT for 18 counties in Michigan. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2012, 10:00 AM EDT (14:00 UTC)
Expired: Jun 19, 2012, 11:00 AM EDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Alcona County, MI, Alpena County, MI, Antrim County, MI, Benzie County, MI, Cheboygan County, MI, Crawford County, MI, Emmet County, MI, Grand Traverse County, MI, Iosco County, MI, Kalkaska County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI

The radar

The NCL Michigan radar (KAPX), 7 km from the middle of the area, began a volume at 14:02 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.

Severe Thunderstorm Watch 411Jun 19, 10:15 AM EDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.0 hours before the alert went out and 266 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: 1244 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 1246 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 196 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
Jun 19, 6:11 AM EDT	Mesoscale Discussion	SPC	Menominee	34 min
Jun 19, 10:11 AM EDT	Severe Thunderstorm Watch	SPC	Alcona, Alpena, Antrim, Benzie, Charlevoix, Cheboygan and 9 more	3 hr
Jun 19, 12:33 PM EDT	Mesoscale Discussion	SPC	Alcona, Alpena, Presque Isle	57 min

Nearby

Mesoscale Discussions in Michigan, 2012 Every mesoscale discussion in 2012

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.