Alert archive / Oregon / Mesoscale Discussions in 2005

Mesoscale Discussion 2583

December 19, 20056 counties in Idaho; 10 counties in Oregon; 9 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Dec 19, 2005, 12:56 PM MST for 6 counties in Idaho; 10 counties in Oregon; 9 counties in Washington. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Dec 19, 2005, 12:56 PM MST (19:56 UTC)
Expired: Dec 19, 2005, 6:00 PM MST
In force: 5 hr
Issued by: the Storm Prediction Center

All 25 counties

Ada County, ID, Adams County, ID, Canyon County, ID, Gem County, ID, Payette County, ID, Washington County, ID, Baker County, OR, Gilliam County, OR, Hood River County, OR, Jefferson County, OR, Morrow County, OR, Sherman County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Wasco County, OR, Asotin County, WA, Benton County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Klickitat County, WA, Skamania County, WA, Walla Walla County, WA, Yakima County, WA

The radar

The Pendleton radar (KPDT), 64 km from the middle of the area, began a volume at 19:59 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 12:00Z, 7.9 hours before the alert went out and 355 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: 1569 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 211 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.

Issued	Product	Office	Counties	Lasted
Dec 18, 5:57 PM MST	Mesoscale Discussion	SPC	Ada, Adams, Blaine, Boise, Camas, Canyon and 13 more	5 hr
Dec 19, 8:57 AM MST	Mesoscale Discussion	SPC	Ada, Adams, Canyon, Gem, Owyhee, Payette and 1 more	4 hr

Nearby

Mesoscale Discussions in Oregon, 2005 Mesoscale Discussions in Washington, 2005 Mesoscale Discussions in Idaho, 2005 Every mesoscale discussion in 2005

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.