Alert archive / North Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1455

July 24, 20148 counties in Montana; 9 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2014, 1:41 AM MDT for 8 counties in Montana; 9 counties in North Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 24, 2014, 1:41 AM MDT (07:41 UTC)
Expired: Jul 24, 2014, 3:45 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Daniels County, MT, Garfield County, MT, McCone County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Burke County, ND, Divide County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mountrail County, ND, Renville County, ND, Ward County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 197 km from the middle of the area, began a volume at 07:41 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.

Severe Thunderstorm Watch 438Jul 24, 2:20 AM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 7.7 hours before the alert went out and 195 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: 987 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 2178 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.0

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 23, 6:58 PM MDT	Mesoscale Discussion	SPC	Flathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more	92 min
Jul 23, 7:52 PM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Garfield, Golden Valley and 12 more	113 min
Jul 23, 8:28 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	92 min
Jul 23, 8:31 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Cascade, Chouteau, Fergus, Garfield and 13 more	6 hr
Jul 23, 10:52 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	83 min
Jul 24, 2:27 AM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, McCone, Prairie, Richland, Roosevelt and 2 more	6 hr
Jul 24, 1:50 PM MDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Fergus, Garfield, Hill and 7 more	55 min
Jul 24, 2:54 PM MDT	Severe Thunderstorm Watch	SPC	Daniels, Dawson, Garfield, McCone, Phillips, Richland and 4 more	6 hr
Jul 24, 3:07 PM MDT	Mesoscale Discussion	SPC	Big Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more	53 min
Jul 24, 4:53 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Daniels, Dawson, Fallon, Garfield and 9 more	97 min
Jul 24, 5:47 AM MDT	Mesoscale Discussion	SPC	Billings, Bottineau, Burke, Burleigh, Dunn, McHenry and 9 more	118 min
Jul 24, 10:06 AM MDT	Mesoscale Discussion	SPC	Dickey, Richland, Sargent	84 min

Nearby

Mesoscale Discussions in North Dakota, 2014 Mesoscale Discussions in Montana, 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.