Alert archive / Oregon / Mesoscale Discussions in 2008

Mesoscale Discussion 91

January 27, 2008Siskiyou County, Trinity County, California; 6 counties in Oregon

The Storm Prediction Center issued this mesoscale discussion at Jan 27, 2008, 9:53 AM PST for Siskiyou County, Trinity County, California; 6 counties in Oregon. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 27, 2008, 9:53 AM PST (17:53 UTC)
Expired: Jan 27, 2008, 4:00 PM PST
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Siskiyou County, CA, Trinity County, CA, Douglas County, OR, Jackson County, OR, Josephine County, OR, Lane County, OR, Linn County, OR, Marion County, OR

The radar

The Medford radar (KMAX), 38 km from the middle of the area, began a volume at 17:57 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

Reno, NV (KREV), launched 12:00Z, 5.9 hours before the alert went out and 498 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: 804 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 374 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
Jan 27, 9:39 AM PST	Mesoscale Discussion	SPC	Ventura	2 hr
Jan 27, 12:10 PM PST	Mesoscale Discussion	SPC	Fresno, Kings, Merced, Monterey, San Benito, San Luis Obispo	2 hr
Jan 27, 12:48 PM PST	Severe Thunderstorm Watch	SPC	Fresno, Kern, Kings, Los Angeles, Madera, Mariposa and 7 more	5 hr
Jan 26, 4:21 PM PST	Mesoscale Discussion	SPC	Clackamas, Gilliam, Hood River, Lane, Linn, Marion and 5 more	5 hr
Jan 27, 4:51 AM PST	Mesoscale Discussion	SPC	Baker, Morrow, Umatilla, Union, Wallowa	5 hr

Nearby

Mesoscale Discussions in Oregon, 2008 Mesoscale Discussions in California, 2008 Every mesoscale discussion in 2008

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.