Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 2126

August 27, 200421 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2004, 2:39 AM EDT for 21 counties in Michigan. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Aug 27, 2004, 2:39 AM EDT (06:39 UTC)
Expired: Aug 27, 2004, 3:45 AM EDT
In force: 66 min
Issued by: the Storm Prediction Center

All 21 counties

Antrim County, MI, Arenac County, MI, Benzie County, MI, Cheboygan County, MI, Clare County, MI, Crawford County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Kalkaska County, MI, Lake County, MI, Leelanau County, MI, Manistee County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Wexford County, MI

The radar

The NCL Michigan radar (KAPX), 9 km from the middle of the area, began a volume at 06:41 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

Alpena, MI (KAPX), launched 00:00Z, 6.7 hours before the alert went out and 184 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: 772 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1031 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 27, 2:25 AM EDT	Severe Thunderstorm Watch	SPC	Allegan, Arenac, Barry, Bay, Berrien, Cass and 21 more	6 hr
Aug 27, 5:36 AM EDT	Mesoscale Discussion	SPC	Allegan, Arenac, Barry, Bay, Berrien, Branch and 36 more	84 min
Aug 27, 7:33 AM EDT	Mesoscale Discussion	SPC	Arenac, Bay, Branch, Calhoun, Clinton, Eaton and 17 more	27 min
Aug 27, 1:39 PM EDT	Mesoscale Discussion	SPC	Barry, Bay, Calhoun, Clinton, Eaton, Genesee and 23 more	2 hr

Nearby

Mesoscale Discussions in Michigan, 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.