Alert archive / Montana / Mesoscale Discussions in 2026

Mesoscale Discussion 1012

June 6, 202611 counties in Montana; 6 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2026, 8:54 PM MDT for 11 counties in Montana; 6 counties in North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2026, 8:54 PM MDT (02:54 UTC)
Expired: Jun 6, 2026, 11:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 283

Counties Daniels County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Billings County, ND, Burke County, ND, Divide County, ND, Golden Valley County, ND, McKenzie County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 114 km from the middle of the area, began a volume at 02:55 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.9 hours before the alert went out and 359 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: 690 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 2573 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 6, 6:37 PM MDT	Severe Thunderstorm Watch	SPC	Custer, Daniels, Dawson, Fallon, Garfield, McCone and 9 more	9 hr
Jun 7, 12:06 AM MDT	Mesoscale Discussion	SPC	Dawson, McCone, Prairie, Richland, Roosevelt, Sheridan and 1 more	114 min
Jun 7, 1:50 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River, Rosebud, Wibaux	115 min
Jun 7, 2:58 PM MDT	Severe Thunderstorm Watch PDS	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Powder River and 5 more	11 hr
Jun 7, 5:12 PM MDT	Mesoscale Discussion	SPC	Carter, Fallon	93 min
Jun 7, 5:45 PM MDT	Mesoscale Discussion	SPC	Billings, Burke, Dunn, Golden Valley, McKenzie, Mountrail	90 min

Nearby

Mesoscale Discussions in Montana, 2026 Mesoscale Discussions in North Dakota, 2026 Every mesoscale discussion in 2026

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.