Alert archive / Idaho / Winter Weather Advisories in 2021

Winter Weather Advisory 46, NWS Spokane, WA

December 23, 2021Chelan County, Washington; 4 counties in Idaho

NWS Spokane, WA issued this winter weather advisory at Dec 23, 2021, 12:53 PM PST for Chelan County, Washington; 4 counties in Idaho. It was in force for 45 hr.

The area

The counties it named.

The facts

Issued: Dec 23, 2021, 12:53 PM PST (20:53 UTC)
Expired: Dec 25, 2021, 10:00 AM PST
In force: 45 hr
Issued by: NWS Spokane, WA

Counties Benewah County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID, Chelan County, WA

The radar

The Spokane radar (KOTX), 40 km from the middle of the area, began a volume at 20:56 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

Spokane, WA (KOTX), launched 12:00Z, 8.9 hours before the alert went out and 77 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: 807 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 246 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 Spokane, WA wrote its last area forecast discussion before this winter weather advisory went out at Dec 23, 10:08 AM PST, 2 hours 45 minutes earlier.

Area forecast discussion, Dec 23, 10:08 AM PST, 2 hours 45 minutes before

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Hazardous weather outlook, Dec 23, 8:24 AM PST, 4 hours 29 minutes before

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</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.
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        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 Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 22, 11:41 PM PST	Dense Fog Advisory	OTX	Adams, Douglas, Grant	7 hr
Dec 23, 3:01 PM PST	Winter Storm Warning	OTX	Pend Oreille, Spokane, Stevens	3 days

Nearby

Winter Weather Advisories in Idaho, 2021 Winter Weather Advisories in Washington, 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.