Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 766

May 31, 201417 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at May 31, 2014, 4:43 PM MDT for 17 counties in Montana. It was in force for 47 min.

The area

The outline as issued.

The facts

Issued: May 31, 2014, 4:43 PM MDT (22:43 UTC)
Expired: May 31, 2014, 5:30 PM MDT
In force: 47 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 199

Counties Big Horn County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Treasure County, MT, Valley County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 153 km from the middle of the area, began a volume at 22:46 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.7 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2972 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 141 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
May 31, 12:32 PM MDT	Mesoscale Discussion	SPC	Big Horn, Custer, Dawson, Garfield, McCone, Phillips and 4 more	118 min
May 31, 2:22 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carbon, Carter, Custer, Daniels, Dawson and 16 more	7 hr
May 31, 5:12 PM MDT	Mesoscale Discussion	SPC	Chouteau, Fergus, Gallatin, Hill, Judith Basin, Meagher and 3 more	93 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.