Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 1452

July 23, 201418 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2014, 7:52 PM MDT for 18 counties in Montana. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2014, 7:52 PM MDT (01:52 UTC)
Expired: Jul 23, 2014, 9:45 PM MDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Blaine County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, Judith Basin County, MT, Liberty County, MT, McCone County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT

The radar

The Glasgow radar (KGGW), 115 km from the middle of the area, began a volume at 01:53 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 437Jul 23, 8:30 PM MDT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.9 hours before the alert went out and 118 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, 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, 1:41 AM MDT	Mesoscale Discussion	SPC	Daniels, Garfield, McCone, Phillips, Richland, Roosevelt and 2 more	2 hr
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

Nearby

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.