Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1735

July 25, 201111 counties in Colorado; 4 counties in Nebraska; 6 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2011, 1:32 PM MDT for 11 counties in Colorado; 4 counties in Nebraska; 6 counties in Wyoming. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2011, 1:32 PM MDT (19:32 UTC)
Expired: Jul 25, 2011, 3:00 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

All 21 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Morgan County, CO, Weld County, CO, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 13 km from the middle of the area, began a volume at 19:35 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 nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 7.5 hours before the alert went out and 360 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: 2427 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1325 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 25, 11:23 AM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Crook, Niobrara, Weston	97 min
Jul 25, 1:30 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Crook, Sheridan, Weston	8 hr

Nearby

Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Wyoming, 2011 Mesoscale Discussions in Nebraska, 2011 Every mesoscale discussion in 2011

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.