Alert archive / Oregon / Winter Storm Warnings in 2020

Winter Storm Warning 7, NWS Pendleton, OR

November 12, 202010 counties in Oregon; Columbia County, Walla Walla County, Washington

NWS Pendleton, OR issued this winter storm warning at Nov 12, 2020, 8:24 AM PST for 10 counties in Oregon; Columbia County, Walla Walla County, Washington. It took effect at Nov 12, 2020, 4:00 PM PST. It was in force for 36 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: Nov 12, 2020, 8:24 AM PST (16:24 UTC)
In effect from: Nov 12, 2020, 4:00 PM PST
Expired: Nov 14, 2020, 4:00 AM PST
In force: 36 hr
Issued by: NWS Pendleton, OR

Counties Deschutes County, OR, Gilliam County, OR, Grant County, OR, Jefferson County, OR, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wasco County, OR, Wheeler County, OR, Columbia County, WA, Walla Walla County, WA

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 4.4 hours before the alert went out and 313 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: 1005 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 167 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 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 Nov 12, 3:32 AM PST, 4 hours 52 minutes earlier.

Area forecast discussion, Nov 12, 3:32 AM PST, 4 hours 52 minutes before

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The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 12, 2:14 PM PST	Winter Weather Advisory	PDT	Crook, Deschutes, Grant, Jefferson, Union, Wallowa and 1 more	24 hr
Nov 12, 2:28 PM PST	Wind Advisory	PDT	Union	24 hr

Nearby

Winter Storm Warnings in Oregon, 2020 Winter Storm Warnings in Washington, 2020 Every winter storm warning in 2020

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.