Alert archive / Idaho / Winter Weather Advisories in 2021
Winter Weather Advisory 45, NWS Spokane, WA
NWS Spokane, WA issued this winter weather advisory at Dec 21, 2021, 2:48 PM PST for 4 counties in Idaho. It took effect at Dec 22, 2021, 4:00 PM PST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 21, 2021, 2:48 PM PST (22:48 UTC)
- In effect from
- Dec 22, 2021, 4:00 PM PST
- Expired
- Dec 22, 2021, 4:04 AM PST
- In force
- Issued by
- NWS Spokane, WA
Counties Benewah County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID
The radar
The Spokane radar (KOTX), 97 km from the middle of the area, began a volume at 22:49 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, 10.8 hours before the alert went out and 49 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 645 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 21, 11:41 AM PST, 3 hours 7 minutes earlier.
Area forecast discussion, Dec 21, 11:41 AM PST, 3 hours 7 minutes before
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</html>Hazardous weather outlook, Dec 21, 5:18 AM PST, 9 hours 30 minutes before
Hazardous Weather Outlook National Weather Service Spokane WA 518 AM PST Tue Dec 21 2021 IDZ002>004-026-027-WAZ031>036-038-041-043-044-047-049-221330- Coeur d'Alene Area-Idaho Palouse-Central Panhandle Mountains- Lewiston Area-Lewis and Southern Nez Perce Counties- Northeast Blue Mountains-Lower Garfield and Asotin Counties- Washington Palouse-Moses Lake Area-Upper Columbia Basin- Spokane Area-Okanogan Highlands-Wenatchee Area-Okanogan Valley- Waterville Plateau-Central Chelan County-Western Okanogan County- 518 AM PST Tue Dec 21 2021 This Hazardous Weather Outlook is for portions of North Idaho... North Central Idaho...Central Washington...East Central Washington...North Central Washington...Northeast Washington and Southeast Washington. .DAY ONE...TODAY AND TONIGHT Precipitation will return as snow late this evening bringing light widespread snow accumulations. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Most precipitation will transition to rain Wednesday morning. There will be multiple rounds of light snow through the week into the weekend, along with much colder temperatures. IDZ001-WAZ037-048-221330- Northern Panhandle-Northeast Mountains-Western Chelan County- 518 AM PST Tue Dec 21 2021 This Hazardous Weather Outlook is for portions of North Idaho... North Central Washington and Northeast Washington. .DAY ONE...TODAY AND TONIGHT Precipitation will return as snow late this evening bringing moderate snow accumulations. The heaviest snow will be for the Cascades, northeastern Washington mountains, and northern Idaho. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Snow accumulations will continue into the early afternoon on Wednesday. There will be multiple rounds of light snow throughout the week into the weekend, along with much colder temperatures.
The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 21, 4:33 AM PST | Winter Storm Watch | OTX | Chelan, Pend Oreille, Spokane, Stevens | 10 hr |
| Dec 21, 2:33 PM PST | Winter Storm Warning | OTX | Chelan | 61 hr |
| Dec 21, 2:33 PM PST | Winter Weather Advisory | OTX | Adams, Douglas, Grant, Lincoln, Okanogan, Pend Oreille and 2 more | 15 hr |
Nearby
Winter Weather Advisories in Idaho, 2021Every 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.