Alert archive / California / Mesoscale Discussions in 2004

Mesoscale Discussion 2592

December 30, 20048 counties in California

The Storm Prediction Center issued this mesoscale discussion at Dec 30, 2004, 5:01 AM PST for 8 counties in California. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Dec 30, 2004, 5:01 AM PST (13:01 UTC)
Expired
Dec 30, 2004, 9:00 AM PST
In force
4 hr
Issued by
the Storm Prediction Center

Counties El Dorado County, CA, Nevada County, CA, Placer County, CA, Plumas County, CA, Sierra County, CA, Siskiyou County, CA, Trinity County, CA, Tuolumne County, CA

The radar

The Beale AFB radar (KBBX), 73 km from the middle of the area, began a volume at 13:03 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

Oakland, CA (KOAK), launched 12:00Z, 1.0 hours before the alert went out and 275 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, Oakland, CA at 12:00Z on 2004-12-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 60 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, Oakland, CA at 12:00Z on 2004-12-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 203 square meters per square second.1939587897117Sfc1 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
60 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
203 m²/s²
0-3 km storm-relative helicity
339 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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
Dec 29, 4:42 PM PSTMesoscale DiscussionSPCEl Dorado, Nevada, Placer, Plumas, Sierra, Siskiyou and 1 more5 hr
Dec 29, 10:17 PM PSTMesoscale DiscussionSPCNevada, Plumas, Sierra, Siskiyou, Trinity4 hr
Dec 30, 11:03 AM PSTMesoscale DiscussionSPCEl Dorado, Nevada, Placer, Sierra, Tuolumne5 hr

Nearby

Mesoscale Discussions in California, 2004Every mesoscale discussion in 2004

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.