Alert archive / Montana / Mesoscale Discussions in 2018

Mesoscale Discussion 688

June 9, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2018, 6:35 PM MDT for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 9, 2018, 6:35 PM MDT (00:35 UTC)
Expired: Jun 9, 2018, 8:00 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Bowman County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Crook County, WY

The radar

The Rapid City radar (KUDX), 230 km from the middle of the area, began a volume at 00:38 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.6 hours before the alert went out and 313 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: 1571 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 2120 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

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 9, 7:11 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Fergus, Hill, Judith Basin	94 min
Jun 10, 1:15 PM MDT	Mesoscale Discussion	SPC	Carter	2 hr
Jun 10, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bottineau, Bowman, Burke, Burleigh and 19 more	7 hr
Jun 10, 5:15 PM MDT	Mesoscale Discussion	SPC	Adams, Bottineau, Burke, Burleigh, Dunn, Emmons and 13 more	2 hr
Jun 10, 2:52 PM MDT	Tornado Watch	SPC	Butte, Corson, Dewey, Haakon, Harding, Lawrence and 5 more	7 hr
Jun 10, 5:36 PM MDT	Mesoscale Discussion	SPC	Butte, Corson, Custer, Dewey, Haakon, Harding and 11 more	114 min

Nearby

Mesoscale Discussions in Montana, 2018 Mesoscale Discussions in South Dakota, 2018 Mesoscale Discussions in North Dakota, 2018 Every mesoscale discussion in 2018

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.