Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 1450

July 23, 2014Bonner County, Boundary County, Idaho; 8 counties in Montana; Ferry County, Pend Oreille County, Stevens County, Washington

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2014, 5:58 PM PDT for Bonner County, Boundary County, Idaho; 8 counties in Montana; Ferry County, Pend Oreille County, Stevens County, Washington. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2014, 5:58 PM PDT (00:58 UTC)
Expired: Jul 23, 2014, 7:30 PM PDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Bonner County, ID, Boundary County, ID, Flathead County, MT, Granite County, MT, Lake County, MT, Lincoln County, MT, Mineral County, MT, Missoula County, MT, Ravalli County, MT, Sanders County, MT, Ferry County, WA, Pend Oreille County, WA, Stevens County, WA

The radar

The Missoula radar (KMSX), 110 km from the middle of the area, began a volume at 01:00 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

Spokane, WA (KOTX), launched 00:00Z, 1.0 hours before the alert went out and 87 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1575 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -100 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 23, 6:52 PM PDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Garfield, Golden Valley and 12 more	113 min
Jul 23, 7:28 PM PDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	92 min
Jul 23, 7:31 PM PDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Garfield and 13 more	6 hr
Jul 23, 9:52 PM PDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	83 min
Jul 24, 12:41 AM PDT	Mesoscale Discussion	SPC	Daniels, Garfield, McCone, Phillips, Richland, Roosevelt and 2 more	2 hr
Jul 24, 1:27 AM PDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, McCone, Prairie, Richland, Roosevelt and 2 more	6 hr
Jul 24, 12:50 PM PDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Fergus, Garfield, Hill and 7 more	55 min
Jul 24, 1:54 PM PDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Phillips, Richland and 4 more	6 hr
Jul 24, 2:07 PM PDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more	53 min
Jul 24, 3:53 PM PDT	Mesoscale Discussion	SPC	Carter, Custer, Daniels, Dawson, Fallon, Garfield and 9 more	97 min

Nearby

Mesoscale Discussions in Montana, 2014 Mesoscale Discussions in Washington, 2014 Mesoscale Discussions in Idaho, 2014 Every mesoscale discussion in 2014

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.