Alert archive / Idaho / Mesoscale Discussions in 2020

Mesoscale Discussion 1571

August 25, 202017 counties in Idaho; Beaverhead County, Madison County, Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2020, 1:18 PM MDT for 17 counties in Idaho; Beaverhead County, Madison County, Montana. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Aug 25, 2020, 1:18 PM MDT (19:18 UTC)
Expired: Aug 25, 2020, 3:15 PM MDT
In force: 117 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Ada County, ID, Blaine County, ID, Boise County, ID, Butte County, ID, Camas County, ID, Clark County, ID, Custer County, ID, Elmore County, ID, Fremont County, ID, Gooding County, ID, Jefferson County, ID, Jerome County, ID, Lemhi County, ID, Lincoln County, ID, Minidoka County, ID, Owyhee County, ID, Twin Falls County, ID, Beaverhead County, MT, Madison County, MT

The radar

The Pocatello radar (KSFX), 138 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 152 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: 2294 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 102 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
Aug 25, 5:48 PM MDT	Mesoscale Discussion	SPC	Broadwater, Gallatin, Golden Valley, Madison, Meagher, Musselshell and 5 more	117 min

Nearby

Mesoscale Discussions in Idaho, 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.