Alert archive / Oregon / Mesoscale Discussions in 2011

Mesoscale Discussion 791

May 14, 20116 counties in Idaho; 8 counties in Oregon

The Storm Prediction Center issued this mesoscale discussion at May 14, 2011, 4:53 PM MDT for 6 counties in Idaho; 8 counties in Oregon. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: May 14, 2011, 4:53 PM MDT (22:53 UTC)
Expired: May 14, 2011, 6:00 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Ada County, ID, Canyon County, ID, Gem County, ID, Owyhee County, ID, Payette County, ID, Washington County, ID, Baker County, OR, Grant County, OR, Harney County, OR, Malheur County, OR, Morrow County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR

The radar

The Boise radar (KCBX), 179 km from the middle of the area, began a volume at 22:53 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

Boise Airport, ID (KBOI), launched 12:00Z, 10.9 hours before the alert went out and 182 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: 2377 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 18 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
May 14, 12:25 PM MDT	Mesoscale Discussion	SPC	Canyon, Payette, Washington	65 min
May 14, 1:28 PM MDT	Severe Thunderstorm Watch	SPC	Baker, Crook, Gilliam, Grant, Harney, Malheur and 5 more	7 hr

Nearby

Mesoscale Discussions in Oregon, 2011 Mesoscale Discussions in Idaho, 2011 Every mesoscale discussion in 2011

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.