Alert archive / Colorado / Mesoscale Discussions in 2013

Mesoscale Discussion 808

May 26, 20134 states

The Storm Prediction Center issued this mesoscale discussion at May 26, 2013, 2:49 PM MDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 26, 2013, 2:49 PM MDT (20:49 UTC)
Expired: May 26, 2013, 3:45 PM MDT
In force: 56 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 31 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Washington County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Lawrence County, SD, Albany County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Johnson County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY, Weston County, WY

The radar

The Cheyenne radar (KCYS), 124 km from the middle of the area, began a volume at 20:52 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

Riverton, WY (KRIW), launched 12:00Z, 8.8 hours before the alert went out and 298 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2715 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 75 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
May 25, 6:36 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Blaine, Buffalo, Custer, Dawson, Franklin and 16 more	4 hr
May 25, 8:43 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Blaine, Boone, Buffalo, Butler and 35 more	92 min
May 25, 9:59 PM MDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon, Knox, Thurston, Wayne	91 min
May 26, 2:03 PM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Buffalo, Custer, Dawson, Garden and 8 more	87 min
May 26, 5:47 PM MDT	Mesoscale Discussion	SPC	Cass, Douglas, Johnson, Lancaster, Nemaha, Otoe and 3 more	88 min
May 26, 5:55 PM MDT	Mesoscale Discussion	SPC	Adams, Blaine, Boone, Buffalo, Butler, Clay and 27 more	2 hr
May 25, 7:48 PM MDT	Mesoscale Discussion	SPC	Buffalo, Butte, Campbell, Corson, Dewey, Haakon and 16 more	87 min
May 26, 12:17 AM MDT	Severe Thunderstorm Watch	SPC	Buffalo, Corson, Dewey, Edmunds, Faulk, Haakon and 12 more	5 hr
May 26, 2:24 AM MDT	Mesoscale Discussion	SPC	Beadle, Brule, Buffalo, Corson, Dewey, Faulk and 10 more	96 min
May 26, 3:47 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Crook, Sheridan	6 hr

Nearby

Mesoscale Discussions in Colorado, 2013 Mesoscale Discussions in Wyoming, 2013 Mesoscale Discussions in Nebraska, 2013 Every mesoscale discussion in 2013

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.