Alert archive / Idaho / Mesoscale Discussions in 2020

Mesoscale Discussion 772

May 31, 202011 counties in Idaho; Baker County, Union County, Wallowa County, Oregon; Asotin County, Columbia County, Garfield County, Washington

The Storm Prediction Center issued this mesoscale discussion at May 31, 2020, 2:38 AM MDT for 11 counties in Idaho; Baker County, Union County, Wallowa County, Oregon; Asotin County, Columbia County, Garfield County, Washington. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 31, 2020, 2:38 AM MDT (08:38 UTC)
Expired: May 31, 2020, 4:45 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Ada County, ID, Adams County, ID, Boise County, ID, Canyon County, ID, Gem County, ID, Idaho County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Valley County, ID, Washington County, ID, Baker County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA, Columbia County, WA, Garfield County, WA

The radar

The Pendleton radar (KPDT), 176 km from the middle of the area, began a volume at 08:40 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 00:00Z, 8.6 hours before the alert went out and 286 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: 124 J/kg
Mixed-layer CIN: -408 J/kg
Mixed-layer LCL: 2380 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 350 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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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 9:06 PM MDT	Mesoscale Discussion	SPC	Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah and 3 more	114 min

Nearby

Mesoscale Discussions in Idaho, 2020 Mesoscale Discussions in Oregon, 2020 Mesoscale Discussions in Washington, 2020 Every mesoscale discussion in 2020

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.