Alert archive / Minnesota / Mesoscale Discussions in 2012

Mesoscale Discussion 1694

August 3, 2012Worth County, Iowa; 39 counties in Minnesota; 25 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2012, 10:33 PM CDT for Worth County, Iowa; 39 counties in Minnesota; 25 counties in Wisconsin. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Aug 3, 2012, 10:33 PM CDT (03:33 UTC)
Expired
Aug 4, 2012, 12:00 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 65 counties

Worth County, IA, Aitkin County, MN, Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carlton County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Isanti County, MN, Kanabec County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Pine County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Barron County, WI, Bayfield County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Washburn County, WI, Wood County, WI

The radar

The Minneapolis radar (KMPX), 105 km from the middle of the area, began a volume at 03:35 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.6 hours before the alert went out and 107 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 576 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
576 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1840 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.1
Supercell composite
7.5

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.

IssuedProductOfficeCountiesLasted
Aug 3, 7:33 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more6 hr
Aug 4, 10:26 AM CDTMesoscale DiscussionSPCAppanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 44 more49 min
Aug 4, 10:50 AM CDTSevere Thunderstorm WatchSPCAppanoose, Benton, Black Hawk, Buchanan, Cedar, Clinton and 27 more5 hr
Aug 4, 1:09 PM CDTMesoscale DiscussionSPCBenton, Buchanan, Cedar, Clayton, Clinton, Delaware and 15 more66 min
Aug 3, 10:57 PM CDTSevere Thunderstorm WatchSPCDodge, Freeborn, Goodhue, Olmsted, Steele, Wabasha and 1 more4 hr
Aug 4, 1:41 AM CDTMesoscale DiscussionSPCClark, Iron, Jackson, La Crosse, Lincoln, Marathon and 6 more64 min
Aug 4, 1:46 PM CDTSevere Thunderstorm WatchSPCDane, Dodge, Green, Jefferson, Kenosha, Lafayette and 7 more4 hr

Nearby

Mesoscale Discussions in Minnesota, 2012Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Iowa, 2012Every 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.