Alert archive / Colorado / Mesoscale Discussions in 2009

Mesoscale Discussion 952

June 5, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2009, 2:18 PM MDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Jun 5, 2009, 2:18 PM MDT (20:18 UTC)
Expired: Jun 5, 2009, 3:45 PM MDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Adams County, CO, Arapahoe County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Sherman County, KS, Banner County, NE, Cheyenne County, NE, Dundy County, NE, Kimball County, NE, Scotts Bluff County, NE, Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 87 km from the middle of the area, began a volume at 20:21 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.

Tornado Watch 332Jun 5, 2:50 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.3 hours before the alert went out and 129 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: 997 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 1029 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Jun 5, 2:48 PM MDT	Tornado Watch	SPC	Kit Carson, Logan, Morgan, Phillips, Sedgwick, Washington and 2 more	7 hr
Jun 5, 5:37 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Logan, Morgan, Phillips, Sedgwick, Washington and 2 more	83 min
Jun 5, 2:58 PM MDT	Mesoscale Discussion	SPC	Morton, Seward, Stevens	62 min
Jun 5, 3:39 PM MDT	Severe Thunderstorm Watch	SPC	Clark, Ellis, Finney, Ford, Grant, Gray and 15 more	9 hr
Jun 5, 5:06 PM MDT	Tornado Watch	SPC	Arthur, Blaine, Brown, Chase, Cherry, Frontier and 10 more	7 hr

Nearby

Mesoscale Discussions in Colorado, 2009 Mesoscale Discussions in Nebraska, 2009 Mesoscale Discussions in Wyoming, 2009 Every mesoscale discussion in 2009

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.