Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 1903

July 19, 200311 counties in Montana; 7 counties in North Dakota; Butte County, Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2003, 5:02 PM MDT for 11 counties in Montana; 7 counties in North Dakota; Butte County, Harding County, Perkins County, South Dakota. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2003, 5:02 PM MDT (23:02 UTC)
Expired: Jul 19, 2003, 7:00 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

All 21 counties

Big Horn County, MT, Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Rosebud County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Hettinger County, ND, Slope County, ND, Stark County, ND, Butte County, SD, Harding County, SD, Perkins County, SD

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.0 hours before the alert went out and 272 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: 1376 J/kg
Mixed-layer CIN: -250 J/kg
Mixed-layer LCL: 1364 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 65 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
Jul 18, 7:59 PM MDT	Mesoscale Discussion	SPC	Carter, Fallon	61 min
Jul 19, 2:00 PM MDT	Mesoscale Discussion	SPC	Carter, Fallon, Powder River	2 hr
Jul 19, 4:00 PM MDT	Mesoscale Discussion	SPC	Cavalier, Grand Forks, Pembina, Traill, Walsh	90 min
Jul 19, 4:30 PM MDT	Severe Thunderstorm Watch	SPC	Benson, Bottineau, Cavalier, Eddy, Foster, Grand Forks and 13 more	6 hr

Nearby

Mesoscale Discussions in Montana, 2003 Mesoscale Discussions in North Dakota, 2003 Mesoscale Discussions in South Dakota, 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.