Alert archive / Oregon / Winter Weather Advisories in 2021

Winter Weather Advisory 38, NWS Medford, OR

December 23, 20217 counties in Oregon; Modoc County, Siskiyou County, California

NWS Medford, OR issued this winter weather advisory at Dec 23, 2021, 3:22 PM PST for 7 counties in Oregon; Modoc County, Siskiyou County, California. It took effect at Dec 24, 2021, 6:00 AM PST. It was in force for 3 days.

The area

The counties it named.

The facts

Issued: Dec 23, 2021, 3:22 PM PST (23:22 UTC)
In effect from: Dec 24, 2021, 6:00 AM PST
Expired: Dec 27, 2021, 10:00 AM PST
In force: 3 days
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 23:23 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, 11.4 hours before the alert went out and 489 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: 853 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 276 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 23, 8:45 AM PST, 6 hours 37 minutes earlier.

Area forecast discussion, Dec 23, 8:45 AM PST, 6 hours 37 minutes before

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In the hours before

Local storm report, Dec 23, 10:03 AM PST, 5 hours 19 minutes before

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Local storm report, Dec 23, 10:32 AM PST, 4 hours 50 minutes before

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Local storm report, Dec 23, 10:59 AM PST, 4 hours 23 minutes before

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  <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.
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      <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 23, 2:27 AM PST	Small Craft Advisory	MFR		66 hr
Dec 23, 2:27 AM PST	Hazardous Seas Warning	MFR		47 hr
Dec 23, 5:38 AM PST	Winter Storm Warning	MFR	Coos, Curry, Douglas, Jackson, Josephine, Klamath and 1 more	4 days

Nearby

Winter Weather Advisories in Oregon, 2021 Winter Weather Advisories in California, 2021 Every winter weather advisory in 2021

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.