Alert archive / Washington / Winter Weather Advisories in 2016

Winter Weather Advisory 39, NWS Spokane, WA

December 19, 201610 counties in Washington; 5 counties in Idaho

NWS Spokane, WA issued this winter weather advisory at Dec 19, 2016, 3:22 AM PST for 10 counties in Washington; 5 counties in Idaho. It took effect at Dec 19, 2016, 8:00 PM PST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Dec 19, 2016, 3:22 AM PST (11:22 UTC)
In effect from: Dec 19, 2016, 8:00 PM PST
Expired: Dec 20, 2016, 10:00 AM PST
In force: 14 hr
Issued by: NWS Spokane, WA

Counties Benewah County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Adams County, WA, Asotin County, WA, Chelan County, WA, Douglas County, WA, Garfield County, WA, Grant County, WA, Lincoln County, WA, Okanogan County, WA, Spokane County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 64 km from the middle of the area, began a volume at 11:28 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 00:00Z, 11.4 hours before the alert went out and 132 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: 587 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 226 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 19, 2:56 AM PST, 26 minutes earlier.

Area forecast discussion, Dec 19, 2:56 AM PST, 26 minutes before

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Hazardous weather outlook, Dec 18, 5:16 AM PST, 22 hours 6 minutes before

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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 19, 3:22 AM PST	Winter Storm Warning	OTX	Douglas, Ferry, Okanogan, Pend Oreille, Spokane, Stevens	35 hr
Dec 19, 3:22 AM PST	Freezing Rain Advisory	OTX	Adams, Grant	25 hr
Dec 19, 8:05 AM PST	Wind Advisory	OTX	Asotin, Garfield	8 hr

Nearby

Winter Weather Advisories in Washington, 2016 Winter Weather Advisories in Idaho, 2016 Every winter weather advisory in 2016

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.