Alert archive / Montana / Mesoscale Discussions in 2015

Mesoscale Discussion 1302

July 5, 20155 counties in Montana; Billings County, Golden Valley County, McKenzie County, North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2015, 1:06 AM MDT for 5 counties in Montana; Billings County, Golden Valley County, McKenzie County, North Dakota. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2015, 1:06 AM MDT (07:06 UTC)
Expired: Jul 5, 2015, 2:00 AM MDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Dawson County, MT, Garfield County, MT, McCone County, MT, Richland County, MT, Wibaux County, MT, Billings County, ND, Golden Valley County, ND, McKenzie County, ND

The radar

The Glasgow radar (KGGW), 109 km from the middle of the area, began a volume at 07:05 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, 7.1 hours before the alert went out and 109 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: 843 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 1825 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

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
Jul 4, 9:34 PM MDT	Mesoscale Discussion	SPC	Blaine, Chouteau, Garfield, Hill, Liberty, McCone and 3 more	116 min
Jul 4, 9:54 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Chouteau, Dawson, Fergus, Garfield, Hill and 8 more	7 hr
Jul 5, 8:54 AM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Eddy, Foster, Grand Forks, Griggs and 6 more	96 min
Jul 5, 9:40 AM MDT	Severe Thunderstorm Watch	SPC	Barnes, Cass, Grand Forks, Griggs, Nelson, Steele and 2 more	7 hr
Jul 5, 12:19 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Ransom, Richland, Sargent, Traill	86 min

Nearby

Mesoscale Discussions in Montana, 2015 Mesoscale Discussions in North Dakota, 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.