Alert archive / Oregon / Mesoscale Discussions in 2008

Mesoscale Discussion 2107

August 17, 200811 counties in Oregon; 4 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2008, 4:10 PM PDT for 11 counties in Oregon; 4 counties in Washington. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 17, 2008, 4:10 PM PDT (23:10 UTC)
Expired
Aug 17, 2008, 6:15 PM PDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Clackamas County, OR, Crook County, OR, Deschutes County, OR, Gilliam County, OR, Hood River County, OR, Jackson County, OR, Jefferson County, OR, Klamath County, OR, Multnomah County, OR, Sherman County, OR, Wasco County, OR, Kittitas County, WA, Klickitat County, WA, Skamania County, WA, Yakima County, WA

The radar

The Medford radar (KMAX), 206 km from the middle of the area, began a volume at 23:11 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 11.2 hours before the alert went out and 184 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 2008-08-17Temperature 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 2008-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 square meters per square second.193958Sfc1 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
2915 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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, 2008Mesoscale Discussions in Washington, 2008Every mesoscale discussion in 2008

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.