Alert archive / Michigan / Mesoscale Discussions in 2015

Mesoscale Discussion 1584

August 2, 20158 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2015, 12:49 PM EDT for 8 counties in Michigan. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Aug 2, 2015, 12:49 PM EDT (16:49 UTC)
Expired: Aug 2, 2015, 1:45 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

Counties Crawford County, MI, Iosco County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI

The radar

The NCL Michigan radar (KAPX), 40 km from the middle of the area, began a volume at 16:48 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

Alpena, MI (KAPX), launched 12:00Z, 4.8 hours before the alert went out and 152 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: 98 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 2, 5:21 AM EDT	Mesoscale Discussion	SPC	Gogebic, Iron, Ontonagon	2 hr
Aug 2, 8:51 AM EDT	Mesoscale Discussion	SPC	Antrim, Benzie, Charlevoix, Crawford, Delta, Dickinson and 13 more	2 hr
Aug 2, 9:51 AM EDT	Severe Thunderstorm Watch	SPC	Alcona, Alpena, Antrim, Arenac, Benzie, Charlevoix and 19 more	7 hr
Aug 2, 1:09 PM EDT	Mesoscale Discussion	SPC	Delta, Dickinson, Iron, Menominee	2 hr
Aug 2, 2:56 PM EDT	Mesoscale Discussion	SPC	Clinton, Genesee, Ingham, Lapeer, Livingston, Macomb and 6 more	64 min
Aug 2, 3:00 PM EDT	Mesoscale Discussion	SPC	Allegan, Barry, Calhoun, Clinton, Eaton, Gratiot and 13 more	2 hr
Aug 2, 3:59 PM EDT	Severe Thunderstorm Watch	SPC	Alcona, Allegan, Alpena, Antrim, Arenac, Barry and 35 more	7 hr
Aug 2, 6:08 PM EDT	Mesoscale Discussion	SPC	Bay, Clinton, Genesee, Gladwin, Gratiot, Ingham and 15 more	97 min
Aug 2, 6:27 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Calhoun, Clare, Clinton and 34 more	6 hr

Nearby

Mesoscale Discussions in Michigan, 2015 Every mesoscale discussion in 2015

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.