Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 1168

June 25, 2015Dawes County, Sheridan County, Sioux County, Nebraska; 4 counties in South Dakota; Niobrara County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 12:57 AM MDT for Dawes County, Sheridan County, Sioux County, Nebraska; 4 counties in South Dakota; Niobrara County, Weston County, Wyoming. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2015, 12:57 AM MDT (06:57 UTC)
Expired: Jun 25, 2015, 2:30 AM MDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Dawes County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 140 km from the middle of the area, began a volume at 07:00 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, 7.0 hours before the alert went out and 133 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: 696 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.5

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 25, 10:58 AM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 8 more	2 hr
Jun 25, 2:10 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 10 more	65 min
Jun 25, 2:30 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 18 more	8 hr
Jun 25, 4:25 PM MDT	Mesoscale Discussion	SPC	Chase, Custer, Dawson, Deuel, Dundy, Frontier and 11 more	95 min
Jun 25, 5:22 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Deuel and 14 more	83 min
Jun 24, 6:13 PM MDT	Mesoscale Discussion	SPC	Custer, Fall River, Pennington	2 hr
Jun 25, 6:46 AM MDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 1 more	89 min

Nearby

Mesoscale Discussions in South Dakota, 2015 Mesoscale Discussions in Nebraska, 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.