Alert archive / Oregon / Winter Storm Watches in 2021

Winter Storm Watch 4, NWS Pendleton, OR

December 9, 20216 counties in Oregon; Columbia County, Walla Walla County, Washington

NWS Pendleton, OR issued this winter storm watch at Dec 9, 2021, 2:50 AM PST for 6 counties in Oregon; Columbia County, Walla Walla County, Washington. It took effect at Dec 10, 2021, 4:00 PM PST. It was in force for .

The area

The counties it named.

The facts

Issued
Dec 9, 2021, 2:50 AM PST (10:50 UTC)
In effect from
Dec 10, 2021, 4:00 PM PST
Expired
Dec 10, 2021, 10:03 AM PST
In force
Issued by
NWS Pendleton, OR

Counties Deschutes County, OR, Jefferson County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wasco County, OR, Columbia County, WA, Walla Walla County, WA

The radar

The Pendleton radar (KPDT), 49 km from the middle of the area, began a volume at 10:56 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

Boise Airport, ID (KBOI), launched 00:00Z, 10.8 hours before the alert went out and 311 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-pSkew-T log-p diagram, Boise Airport, ID at 00:00Z on 2021-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 40 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 00:00Z on 2021-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
40 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1160 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Winter Storm Watches in Oregon, 2021Winter Storm Watches in Washington, 2021Every winter storm watch in 2021

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.