Alert archive / Washington / Snow Advisories in 2008

Snow Advisory 12, NWS Spokane, WA

January 31, 20089 counties in Washington; Bonner County, Boundary County, Kootenai County, Idaho

NWS Spokane, WA issued this snow advisory at Jan 31, 2008, 1:31 PM PST for 9 counties in Washington; Bonner County, Boundary County, Kootenai County, Idaho. It took effect at Jan 31, 2008, 10:00 PM PST. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Jan 31, 2008, 1:31 PM PST (21:31 UTC)
In effect from: Jan 31, 2008, 10:00 PM PST
Expired: Feb 1, 2008, 2:42 PM PST
In force: 17 hr
Issued by: NWS Spokane, WA

Counties Bonner County, ID, Boundary County, ID, Kootenai County, ID, Adams County, WA, Douglas County, WA, Ferry County, WA, Grant County, WA, Lincoln County, WA, Okanogan County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA

The radar

The Spokane radar (KOTX), 47 km from the middle of the area, began a volume at 21:35 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, 9.5 hours before the alert went out and 128 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: 520 m above ground
0-6 km bulk shear: 94 kt
0-1 km storm-relative helicity: 407 m²/s²
0-3 km storm-relative helicity: 409 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 snow 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 snow advisory went out at Jan 31, 11:02 AM PST, 2 hours 29 minutes earlier.

Area forecast discussion, Jan 31, 11:02 AM PST, 2 hours 29 minutes before

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Hazardous weather outlook, Jan 31, 5:45 AM PST, 7 hours 46 minutes before

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In the hours before

Local storm report, Jan 31, 9:34 AM PST, 3 hours 57 minutes before

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Local storm report, Jan 31, 9:36 AM PST, 3 hours 55 minutes before

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Local storm report, Jan 31, 11:20 AM PST, 2 hours 11 minutes before

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Local storm report, Jan 31, 11:36 AM PST, 1 hour 55 minutes before

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Local storm report, Jan 31, 12:39 PM PST, 52 minutes before

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Local storm report, Jan 31, 1:25 PM PST, 6 minutes before

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Nearby

Snow Advisories in Washington, 2008 Snow Advisories in Idaho, 2008 Every snow advisory in 2008

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.