Alert archive / Oregon / Mesoscale Discussions in 2018

Mesoscale Discussion 806

June 20, 2018Modoc County, California; 11 counties in Oregon

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2018, 1:40 PM PDT for Modoc County, California; 11 counties in Oregon. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 2018, 1:40 PM PDT (20:40 UTC)
Expired
Jun 20, 2018, 3:45 PM PDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Modoc County, CA, Baker County, OR, Crook County, OR, Deschutes County, OR, Grant County, OR, Harney County, OR, Jefferson County, OR, Klamath County, OR, Lake County, OR, Malheur County, OR, Union County, OR, Wheeler County, OR

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.7 hours before the alert went out and 249 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 2018-06-20Temperature 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 2018-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.1939587897Sfc1 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
1850 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Oregon, 2018Mesoscale Discussions in California, 2018Every mesoscale discussion in 2018

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.