Alert archive / Oregon / Winter Storm Warnings in 2020

Winter Storm Warning 2, NWS Pendleton, OR

February 4, 20207 counties in Oregon; Columbia County, Walla Walla County, Washington

NWS Pendleton, OR issued this winter storm warning at Feb 4, 2020, 3:43 AM PST for 7 counties in Oregon; Columbia County, Walla Walla County, Washington. It took effect at Feb 4, 2020, 4:00 PM PST. It was in force for 34 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: Feb 4, 2020, 3:43 AM PST (11:43 UTC)
In effect from: Feb 4, 2020, 4:00 PM PST
Expired: Feb 6, 2020, 2:18 AM PST
In force: 34 hr
Issued by: NWS Pendleton, OR

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

The radar

The Pendleton radar (KPDT), 27 km from the middle of the area, began a volume at 11:40 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, 11.7 hours before the alert went out and 310 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: 1525 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 155 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 Feb 4, 3:23 AM PST, 20 minutes earlier.

Area forecast discussion, Feb 4, 3:23 AM PST, 20 minutes before

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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; radar from the NEXRAD Level II archive.