Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 882

June 4, 20155 counties in South Dakota; Niobrara County, Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2015, 1:29 AM MDT for 5 counties in South Dakota; Niobrara County, Weston County, Wyoming. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2015, 1:29 AM MDT (07:29 UTC)
Expired: Jun 4, 2015, 3:00 AM MDT
In force: 91 min
Issued by: the Storm Prediction Center

Counties Custer County, SD, Fall River County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 95 km from the middle of the area, began a volume at 07:28 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, 7.5 hours before the alert went out and 88 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: 1280 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 148 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 3, 7:14 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Platte	61 min
Jun 3, 7:49 PM MDT	Mesoscale Discussion	SPC	Campbell, Converse, Fremont, Hot Springs, Johnson, Natrona and 3 more	56 min
Jun 3, 8:59 PM MDT	Severe Thunderstorm Watch	SPC	Converse, Goshen, Laramie, Niobrara, Platte	5 hr
Jun 4, 1:53 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Platte	97 min
Jun 4, 2:20 PM MDT	Tornado Watch	SPC	Goshen, Laramie, Platte	8 hr
Jun 4, 5:22 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Platte	113 min

Nearby

Mesoscale Discussions in South Dakota, 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.