Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 984

June 13, 2014Carter County, Custer County, Powder River County, Montana; 5 counties in South Dakota; 5 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2014, 1:46 PM MDT for Carter County, Custer County, Powder River County, Montana; 5 counties in South Dakota; 5 counties in Wyoming. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jun 13, 2014, 1:46 PM MDT (19:46 UTC)
Expired: Jun 13, 2014, 3:15 PM MDT
In force: 89 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Carter County, MT, Custer County, MT, Powder River County, MT, Butte County, SD, Custer County, SD, Fall River County, SD, Lawrence County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 209 km from the middle of the area, began a volume at 19:47 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 291Jun 13, 2:10 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 7.8 hours before the alert went out and 208 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: 1333 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 304 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
Jun 13, 2:17 AM MDT	Mesoscale Discussion	SPC	Blaine, Cascade, Chouteau, Fergus, Judith Basin, Meagher and 1 more	88 min
Jun 13, 1:10 PM MDT	Mesoscale Discussion	SPC	Musselshell, Prairie, Treasure	2 hr
Jun 13, 2:09 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Carter, Custer, Fallon, Musselshell, Powder River and 3 more	9 hr

Nearby

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