Alert archive / Washington / Mesoscale Discussions in 2012

Mesoscale Discussion 2165

December 16, 2012Hood River County, Oregon; 20 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Dec 16, 2012, 3:12 PM PST for Hood River County, Oregon; 20 counties in Washington. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Dec 16, 2012, 3:12 PM PST (23:12 UTC)
Expired
Dec 16, 2012, 7:45 PM PST
In force
5 hr
Issued by
the Storm Prediction Center
All 21 counties

Hood River County, OR, Chelan County, WA, Clallam County, WA, Douglas County, WA, Ferry County, WA, Grant County, WA, Jefferson County, WA, Kittitas County, WA, Klickitat County, WA, Lewis County, WA, Lincoln County, WA, Mason County, WA, Okanogan County, WA, Pierce County, WA, Skagit County, WA, Skamania County, WA, Snohomish County, WA, Stevens County, WA, Thurston County, WA, Whatcom County, WA, Yakima County, WA

The radar

The Seattle radar (KATX), 98 km from the middle of the area, began a volume at 23:12 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

Quillayute State, WA (KUIL), launched 12:00Z, 11.2 hours before the alert went out and 211 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, Quillayute State, WA at 12:00Z on 2012-12-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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, Quillayute State, WA at 12:00Z on 2012-12-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
735 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 16, 12:39 PM PSTMesoscale DiscussionSPCBaker, Crook, Deschutes, Grant, Harney, Klamath and 3 more6 hr

Nearby

Mesoscale Discussions in Washington, 2012Mesoscale Discussions in Oregon, 2012Every mesoscale discussion 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.