Alert archive / Washington / Winter Storm Warnings in 2017
Winter Storm Warning 14, NWS Pendleton, OR
NWS Pendleton, OR issued this winter storm warning at Dec 24, 2017, 3:31 AM PST for Umatilla County, Oregon; Columbia County, Walla Walla County, Washington. It took effect at Dec 24, 2017, 2:00 PM PST. It was in force for 20 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 24, 2017, 3:31 AM PST (11:31 UTC)
- In effect from
- Dec 24, 2017, 2:00 PM PST
- Expired
- Dec 25, 2017, 10:00 AM PST
- In force
- 20 hr
- Issued by
- NWS Pendleton, OR
Counties Umatilla County, OR, Columbia County, WA, Walla Walla County, WA
The radar
The Pendleton radar (KPDT), 54 km from the middle of the area, began a volume at 11:31 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, 11.5 hours before the alert went out and 238 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
- 1350 m above ground
- 0-6 km bulk shear
- 82 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 140 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 storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pendleton, OR wrote its last area forecast discussion before this winter storm warning went out at Dec 24, 2:35 AM PST, 56 minutes earlier.
Area forecast discussion, Dec 24, 2:35 AM PST, 56 minutes before
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Winter Storm Warnings in Washington, 2017Winter Storm Warnings in Oregon, 2017Every winter storm warning in 2017
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.