Alert archive / Montana / Mesoscale Discussions in 2013

Mesoscale Discussion 1346

July 8, 201312 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2013, 1:56 PM MDT for 12 counties in Montana. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2013, 1:56 PM MDT (19:56 UTC)
Expired: Jul 8, 2013, 3:30 PM MDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Flathead County, MT, Glacier County, MT, Lake County, MT, Lewis and Clark County, MT, Lincoln County, MT, Mineral County, MT, Missoula County, MT, Pondera County, MT, Powell County, MT, Sanders County, MT, Teton County, MT, Toole County, MT

The radar

The Missoula radar (KMSX), 125 km from the middle of the area, began a volume at 19:57 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

Great_falls, MT (KTFX), launched 12:00Z, 7.9 hours before the alert went out and 217 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: 110 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1205 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 115 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
Jul 7, 6:31 PM MDT	Mesoscale Discussion	SPC	Beaverhead, Big Horn, Blaine, Broadwater, Carbon, Carter and 31 more	119 min
Jul 8, 9:21 AM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Hill, Liberty, Phillips and 1 more	84 min
Jul 8, 12:05 PM MDT	Mesoscale Discussion	SPC	Broadwater, Cascade, Chouteau, Deer Lodge, Fergus, Golden Valley and 10 more	85 min
Jul 8, 12:54 PM MDT	Mesoscale Discussion	SPC	Daniels, McCone, Phillips, Richland, Roosevelt, Sheridan and 1 more	66 min
Jul 8, 1:04 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Broadwater, Carbon, Fergus, Gallatin, Golden Valley and 10 more	6 hr
Jul 8, 1:23 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more	8 hr
Jul 8, 3:42 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River, Rosebud, Treasure	2 hr
Jul 8, 4:01 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Custer, Fallon, Powder River, Rosebud, Treasure	8 hr
Jul 8, 4:58 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Carter, Custer, Daniels and 28 more	2 hr

Nearby

Mesoscale Discussions in Montana, 2013 Every mesoscale discussion in 2013

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.