Alert archive / Washington / Winter Weather Advisories in 2012
Winter Weather Advisory 9, NWS Spokane, WA
NWS Spokane, WA issued this winter weather advisory at Feb 17, 2012, 4:05 AM PST for 7 counties in Washington; 6 counties in Idaho. It took effect at Feb 17, 2012, 4:00 PM PST. It was in force for 44 hr.
The area
The counties it named.
The facts
- Issued
- Feb 17, 2012, 4:05 AM PST (12:05 UTC)
- In effect from
- Feb 17, 2012, 4:00 PM PST
- Expired
- Feb 19, 2012, 12:12 PM PST
- In force
- 44 hr
- Issued by
- NWS Spokane, WA
Counties Benewah County, ID, Bonner County, ID, Boundary County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID, Asotin County, WA, Chelan County, WA, Douglas County, WA, Ferry County, WA, Garfield County, WA, Grant County, WA, Okanogan County, WA
The radar
The Spokane radar (KOTX), 19 km from the middle of the area, began a volume at 12:08 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, 0.1 hours before the alert went out and 108 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
- 638 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 21 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 Feb 17, 2:39 AM PST, 1 hour 26 minutes earlier.
Area forecast discussion, Feb 17, 2:39 AM PST, 1 hour 26 minutes before
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</html>The office that day
Everything else NWS Spokane, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 17, 4:05 AM PST | Winter Storm Warning | OTX | Pend Oreille, Spokane, Stevens | 46 hr |
Nearby
Winter Weather Advisories in Washington, 2012Winter Weather Advisories in Idaho, 2012Every 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.