Alert archive / Montana / Mesoscale Discussions in 2015

Mesoscale Discussion 1073

June 19, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2015, 2:04 PM MDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2015, 2:04 PM MDT (20:04 UTC)
Expired: Jun 19, 2015, 4:00 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 21 counties

Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Golden Valley County, MT, Musselshell County, MT, Park County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Yellowstone County, MT, Bowman County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY

The radar

The Billings radar (KBLX), 142 km from the middle of the area, began a volume at 20:07 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 314Jun 19, 2:50 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.1 hours before the alert went out and 328 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: 181 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1086 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 8:10 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carbon, Powder River, Rosebud, Stillwater, Treasure and 1 more	65 min
Jun 18, 11:02 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Powder River	3 hr
Jun 19, 12:53 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Fergus, Garfield, McCone and 7 more	2 hr
Jun 19, 2:01 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Prairie, Richland and 4 more	9 hr
Jun 19, 2:51 PM MDT	Tornado Watch	SPC	Big Horn, Carbon, Carter, Custer, Fallon, Musselshell and 5 more	7 hr
Jun 19, 4:48 PM MDT	Mesoscale Discussion	SPC	Dawson, Fallon, McCone, Prairie, Richland, Roosevelt and 2 more	57 min
Jun 19, 2:28 AM MDT	Mesoscale Discussion	SPC	Butte, Haakon, Harding, Lawrence, Meade, Perkins and 1 more	92 min
Jun 19, 9:01 AM MDT	Mesoscale Discussion	SPC	Aurora, Brule, Buffalo, Charles Mix, Davison, Douglas and 9 more	89 min

Nearby

Mesoscale Discussions in Montana, 2015 Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Wyoming, 2015 Every mesoscale discussion in 2015

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.