Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 1077

June 19, 2015Carter County, Powder River County, Montana; 9 counties in South Dakota; Crook County, Sheridan County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2015, 6:38 PM MDT for Carter County, Powder River County, Montana; 9 counties in South Dakota; Crook County, Sheridan County, Wyoming. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2015, 6:38 PM MDT (00:38 UTC)
Expired: Jun 19, 2015, 7:45 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Powder River County, MT, Butte County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Ziebach County, SD, Crook County, WY, Sheridan County, WY

The radar

The Rapid City radar (KUDX), 190 km from the middle of the area, began a volume at 00:41 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 315Jun 19, 9:55 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 0.6 hours before the alert went out and 190 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: 1998 J/kg
Mixed-layer CIN: -196 J/kg
Mixed-layer LCL: 1644 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 20, 2:50 PM MDT	Mesoscale Discussion	SPC	Carter, Powder River	115 min
Jun 19, 8:29 PM MDT	Mesoscale Discussion	SPC	McPherson, Marshall	61 min
Jun 19, 9:31 PM MDT	Mesoscale Discussion	SPC	Aurora, Brule, Buffalo, Charles Mix, Douglas, Haakon and 4 more	59 min
Jun 19, 9:57 PM MDT	Severe Thunderstorm Watch PDS	SPC	Aurora, Beadle, Bennett, Bon Homme, Brookings, Brule and 34 more	5 hr
Jun 20, 12:02 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Charles Mix, Davison and 18 more	58 min

Nearby

Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Montana, 2015 Mesoscale Discussions in Wyoming, 2015 Every mesoscale discussion in 2015

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.