Alert archive / Idaho / Winter Weather Advisories in 2012

Winter Weather Advisory 1, NWS Spokane, WA

January 15, 2012Spokane County, Whitman County, Washington; 6 counties in Idaho

NWS Spokane, WA issued this winter weather advisory at Jan 15, 2012, 3:50 AM PST for Spokane County, Whitman County, Washington; 6 counties in Idaho. It took effect at Jan 15, 2012, 10:00 AM PST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Jan 15, 2012, 3:50 AM PST (11:50 UTC)
In effect from: Jan 15, 2012, 10:00 AM PST
Expired: Jan 16, 2012, 9:59 AM PST
In force: 24 hr
Issued by: NWS Spokane, WA

Counties Benewah County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Shoshone County, ID, Spokane County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 98 km from the middle of the area, began a volume at 11:48 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

Great_falls, MT (KTFX), launched 00:00Z, 11.8 hours before the alert went out and 467 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: 2522 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 289 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 Jan 15, 2:59 AM PST, 51 minutes earlier.

Area forecast discussion, Jan 15, 2:59 AM PST, 51 minutes before

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Hazardous weather outlook, Jan 14, 5:58 AM PST, 21 hours 52 minutes before

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In the hours before

Local storm report, Jan 14, 11:00 PM PST, 4 hours 50 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
Jan 15, 3:23 PM PST	Winter Storm Watch	OTX	Adams, Asotin, Chelan, Douglas, Ferry, Garfield and 7 more	55 hr

Nearby

Winter Weather Advisories in Idaho, 2012 Winter Weather Advisories in Washington, 2012 Every winter weather advisory in 2012

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.