Alert archive / Idaho / Mesoscale Discussions in 2020

Mesoscale Discussion 987

June 24, 20204 counties in Idaho; Flathead County, Lincoln County, Sanders County, Montana; 4 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2020, 1:07 PM PDT for 4 counties in Idaho; Flathead County, Lincoln County, Sanders County, Montana; 4 counties in Washington. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 24, 2020, 1:07 PM PDT (20:07 UTC)
Expired: Jun 24, 2020, 3:30 PM PDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Bonner County, ID, Boundary County, ID, Kootenai County, ID, Shoshone County, ID, Flathead County, MT, Lincoln County, MT, Sanders County, MT, Ferry County, WA, Pend Oreille County, WA, Spokane County, WA, Stevens County, WA

The radar

The Spokane radar (KOTX), 163 km from the middle of the area, began a volume at 20:09 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 12:00Z, 8.1 hours before the alert went out and 99 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: 25 J/kg
Mixed-layer CIN: -241 J/kg
Mixed-layer LCL: 2149 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 175 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
Jun 24, 1:29 PM PDT	Mesoscale Discussion	SPC	Clark, Custer, Idaho, Lemhi, Valley	2 hr
Jun 24, 3:28 PM PDT	Mesoscale Discussion	SPC	Flathead, Glacier, Lake, Pondera, Teton	62 min
Jun 24, 4:11 PM PDT	Severe Thunderstorm Watch	SPC	Blaine, Chouteau, Glacier, Hill, Liberty, Pondera and 2 more	5 hr

Nearby

Mesoscale Discussions in Idaho, 2020 Mesoscale Discussions in Washington, 2020 Mesoscale Discussions in Montana, 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.