Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 741

May 27, 20146 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at May 27, 2014, 10:58 PM MDT for 6 counties in Montana. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: May 27, 2014, 10:58 PM MDT (04:58 UTC)
Expired: May 28, 2014, 12:00 AM MDT
In force: 62 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Custer County, MT, Fallon County, MT, Musselshell County, MT, Prairie County, MT, Rosebud County, MT, Treasure County, MT

The radar

The Billings radar (KBLX), 175 km from the middle of the area, began a volume at 05:01 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, 5.0 hours before the alert went out and 403 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: 3017 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 92 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 27, 6:12 PM MDT	Mesoscale Discussion	SPC	Broadwater, Cascade, Deer Lodge, Fergus, Golden Valley, Granite and 6 more	48 min
May 28, 2:51 AM MDT	Mesoscale Discussion	SPC	Dawson, Prairie, Wibaux	114 min
May 28, 2:12 PM MDT	Mesoscale Discussion	SPC	Big Horn, Blaine, Broadwater, Carbon, Cascade, Chouteau and 17 more	2 hr
May 28, 2:47 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Broadwater, Carbon, Cascade, Custer, Gallatin and 13 more	6 hr
May 28, 4:59 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Chouteau, Daniels, Dawson, Fergus, Garfield and 12 more	7 hr

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.