Alert archive / Oregon / Winter Weather Advisories in 2012

Winter Weather Advisory 39, NWS Medford, OR

December 18, 20127 counties in Oregon; Modoc County, Siskiyou County, California

NWS Medford, OR issued this winter weather advisory at Dec 18, 2012, 2:30 PM PST for 7 counties in Oregon; Modoc County, Siskiyou County, California. It took effect at Dec 20, 2012, 4:00 AM PST. It was in force for 68 hr.

The area

The counties it named.

The facts

Issued: Dec 18, 2012, 2:30 PM PST (22:30 UTC)
In effect from: Dec 20, 2012, 4:00 AM PST
Expired: Dec 23, 2012, 12:00 AM PST
In force: 68 hr
Issued by: NWS Medford, OR

Counties Modoc County, CA, Siskiyou County, CA, Coos County, OR, Curry County, OR, Douglas County, OR, Jackson County, OR, Josephine County, OR, Klamath County, OR, Lake County, OR

The radar

The Medford radar (KMAX), 47 km from the middle of the area, began a volume at 22:30 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 10.5 hours before the alert went out and 23 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: 501 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this winter weather advisory went out at Dec 18, 8:31 AM PST, 5 hours 59 minutes earlier.

Area forecast discussion, Dec 18, 8:31 AM PST, 5 hours 59 minutes before

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In the hours before

Local storm report, Dec 18, 8:35 AM PST, 5 hours 55 minutes before

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Local storm report, Dec 18, 8:42 AM PST, 5 hours 48 minutes before

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Local storm report, Dec 18, 8:56 AM PST, 5 hours 34 minutes before

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Local storm report, Dec 18, 1:25 PM PST, 1 hour 5 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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      <p id="message2">
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Local storm report, Dec 18, 1:28 PM PST, 1 hour 2 minutes before

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<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.
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The office that day

Everything else NWS Medford, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 17, 4:29 PM PST	Gale Watch	MFR		11 hr
Dec 17, 4:29 PM PST	Hazardous Seas Watch	MFR		11 hr
Dec 17, 4:29 PM PST	Hazardous Seas Warning	MFR		4 hr
Dec 17, 4:29 PM PST	Small Craft Advisory for Winds	MFR		11 hr
Dec 17, 8:35 PM PST	Small Craft Advisory for Hazardous Seas	MFR		29 hr
Dec 18, 3:05 AM PST	Gale Warning	MFR		31 hr
Dec 18, 3:05 AM PST	Hazardous Seas Warning	MFR		4 days
Dec 18, 3:05 AM PST	Storm Watch	MFR		12 hr
Dec 18, 4:10 AM PST	High Wind Warning	MFR	Coos, Curry, Douglas, Jackson, Josephine, Klamath and 1 more	63 hr
Dec 18, 1:10 PM PST	Wind Advisory	MFR	Jackson, Klamath	54 hr
Dec 18, 2:30 PM PST	Winter Storm Warning	MFR	Coos, Curry, Douglas, Jackson, Josephine, Klamath and 1 more	5 days
Dec 18, 2:48 PM PST	Storm Warning	MFR		39 hr
Dec 18, 2:51 PM PST	High Surf Warning	MFR	Coos, Curry, Douglas	39 hr
Dec 18, 4:03 AM PST	Winter Storm Watch	MFR	Siskiyou	10 hr

Nearby

Winter Weather Advisories in Oregon, 2012 Winter Weather Advisories in California, 2012 Every winter weather advisory in 2012

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.