Alert archive / Montana / Mesoscale Discussions in 2018

Mesoscale Discussion 603

May 31, 201810 counties in Montana; 7 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at May 31, 2018, 8:18 PM MDT for 10 counties in Montana; 7 counties in North Dakota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 31, 2018, 8:18 PM MDT (02:18 UTC)
Expired: May 31, 2018, 9:15 PM MDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Musselshell County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT, Adams County, ND, Bowman County, ND, Grant County, ND, Hettinger County, ND, Morton County, ND, Sioux County, ND, Slope County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.3 hours before the alert went out and 297 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: 332 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1884 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 279 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 1, 11:03 AM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Dawson, Fallon, McCone and 4 more	117 min
Jun 1, 11:45 AM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Dawson, Fallon, Garfield and 6 more	6 hr
Jun 1, 3:04 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, Powder River, Prairie and 1 more	86 min
May 31, 6:00 PM MDT	Mesoscale Discussion	SPC	Adams, Burleigh, Emmons, Grant, Hettinger, Kidder and 3 more	90 min
Jun 1, 1:13 PM MDT	Mesoscale Discussion	SPC	Adams, Billings, Burke, Burleigh, Dunn, Emmons and 19 more	2 hr
Jun 1, 2:30 PM MDT	Tornado Watch	SPC	Bottineau, Burke, Burleigh, Divide, Dunn, Emmons and 18 more	6 hr
Jun 1, 5:02 PM MDT	Mesoscale Discussion	SPC	Bottineau, Burke, Burleigh, Divide, Dunn, Emmons and 15 more	88 min

Nearby

Mesoscale Discussions in Montana, 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.