Alert archive / Wisconsin / Mesoscale Discussions in 2003

Mesoscale Discussion 460

April 15, 200319 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2003, 2:53 PM CDT for 19 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 15, 2003, 2:53 PM CDT (19:53 UTC)
Expired: Apr 15, 2003, 6:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Brown County, WI, Calumet County, WI, Clark County, WI, Jackson County, WI, Kewaunee County, WI, Langlade County, WI, Manitowoc County, WI, Marathon County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Sheboygan County, WI, Taylor County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 80 km from the middle of the area, began a volume at 19:55 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 122Apr 15, 5:35 PM CDT

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.9 hours before the alert went out and 81 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: 46 J/kg
Mixed-layer CIN: -629 J/kg
Mixed-layer LCL: 1745 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 122 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
Apr 14, 9:47 PM CDT	Mesoscale Discussion	SPC	Florence, Forest, Iron, Oneida, Vilas	3 hr
Apr 15, 4:07 PM CDT	Mesoscale Discussion	SPC	Pierce, Saint Croix	2 hr
Apr 15, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 11 more	6 hr

Nearby

Mesoscale Discussions in Wisconsin, 2003 Every mesoscale discussion in 2003

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.