Alert archive / Oregon / Mesoscale Discussions in 2005

Mesoscale Discussion 2580

December 18, 20054 counties in Idaho; 7 counties in Nevada; 14 counties in Oregon

The Storm Prediction Center issued this mesoscale discussion at Dec 18, 2005, 11:55 AM MST for 4 counties in Idaho; 7 counties in Nevada; 14 counties in Oregon. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Dec 18, 2005, 11:55 AM MST (18:55 UTC)
Expired
Dec 18, 2005, 6:00 PM MST
In force
6 hr
Issued by
the Storm Prediction Center
All 25 counties

Ada County, ID, Canyon County, ID, Owyhee County, ID, Payette County, ID, Churchill County, NV, Elko County, NV, Eureka County, NV, Humboldt County, NV, Lander County, NV, Pershing County, NV, Washoe County, NV, Baker County, OR, Crook County, OR, Deschutes County, OR, Gilliam County, OR, Grant County, OR, Harney County, OR, Jefferson County, OR, Klamath County, OR, Lake County, OR, Malheur County, OR, Morrow County, OR, Sherman County, OR, Wasco County, OR, Wheeler County, OR

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 6.9 hours before the alert went out and 301 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, Medford/Jackson, OR at 12:00Z on 2005-12-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Medford/Jackson, OR at 12:00Z on 2005-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 square meters per square second.19395878Sfc1 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
1172 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
254 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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Nearby

Mesoscale Discussions in Oregon, 2005Mesoscale Discussions in Nevada, 2005Mesoscale Discussions in Idaho, 2005Every 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.