Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 772

May 31, 20145 states

The Storm Prediction Center issued this mesoscale discussion at May 31, 2014, 7:32 PM MDT for 5 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 31, 2014, 7:32 PM MDT (01:32 UTC)
Expired: May 31, 2014, 9:30 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

All 23 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Bowman County, ND, Golden Valley County, ND, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 186 km from the middle of the area, began a volume at 01:35 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

Rapid City, SD (KRAP), launched 00:00Z, 1.5 hours before the alert went out and 187 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: 869 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.0

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
May 31, 6:07 PM MDT	Mesoscale Discussion	SPC	Custer, Dawson, Fallon, Powder River, Prairie	53 min
Jun 1, 12:08 PM MDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Butler, Clay and 33 more	2 hr
Jun 1, 12:28 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Antelope, Boone, Buffalo, Burt, Butler and 50 more	10 hr
Jun 1, 12:51 PM MDT	Mesoscale Discussion	SPC	Chase, Dundy, Hayes, Hitchcock, Red Willow	114 min
Jun 1, 1:34 PM MDT	Mesoscale Discussion	SPC	Cedar, Dakota, Dixon, Pierce, Thurston, Wayne	86 min
Jun 1, 2:42 PM MDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Colfax and 29 more	63 min
Jun 1, 4:24 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 7 more	96 min
Jun 1, 5:25 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Chase, Cherry, Custer, Deuel and 12 more	4 hr
Jun 1, 5:44 PM MDT	Mesoscale Discussion	SPC	Gage, Jefferson, Johnson, Pawnee, Thayer	91 min
Jun 1, 5:50 PM MDT	Mesoscale Discussion	SPC	Richardson	85 min

Nearby

Mesoscale Discussions in Montana, 2014 Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in Wyoming, 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.