Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 771

May 31, 20145 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at May 31, 2014, 6:07 PM MDT for 5 counties in Montana. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: May 31, 2014, 6:07 PM MDT (00:07 UTC)
Expired: May 31, 2014, 7:00 PM MDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.1 hours before the alert went out and 255 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: 70 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1212 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

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, 7:32 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, McCone, Powder River and 5 more	118 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.