Alert archive / South Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 758

June 16, 201811 counties in Nebraska; 19 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2018, 6:59 PM MDT for 11 counties in Nebraska; 19 counties in South Dakota. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Jun 16, 2018, 6:59 PM MDT (00:59 UTC)
Expired
Jun 16, 2018, 8:30 PM MDT
In force
91 min
Issued by
the Storm Prediction Center
All 30 counties

Banner County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Bennett County, SD, Buffalo County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The Rapid City radar (KUDX), 138 km from the middle of the area, began a volume at 01:00 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, 1.0 hours before the alert went out and 138 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2018-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2018-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
717 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 16, 8:50 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Cherry, Dawes, Grant, Morrill and 2 more85 min
Jun 17, 1:05 PM MDTMesoscale DiscussionSPCBlaine, Chase, Custer, Deuel, Dundy, Frontier and 7 more85 min
Jun 17, 1:35 PM MDTTornado WatchSPCArthur, Blaine, Chase, Custer, Deuel, Dundy and 12 more7 hr
Jun 17, 2:52 PM MDTMesoscale DiscussionSPCBurt, Butler, Cass, Cedar, Colfax, Cuming and 17 more53 min
Jun 17, 3:53 PM MDTMesoscale DiscussionSPCArthur, Chase, Cheyenne, Deuel, Dundy, Garden and 9 more97 min
Jun 17, 4:47 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Holt, Knox, Logan and 3 more118 min
Jun 17, 5:47 PM MDTMesoscale DiscussionSPCArthur, Chase, Deuel, Hayes, Hooker, Keith and 5 more88 min
Jun 16, 8:01 PM MDTMesoscale DiscussionSPCBeadle, Brookings, Clark, Codington, Day, Deuel and 6 more119 min
Jun 16, 9:17 PM MDTMesoscale DiscussionSPCBeadle, Brookings, Brown, Clark, Codington, Day and 7 more88 min

Nearby

Mesoscale Discussions in South Dakota, 2018Mesoscale Discussions in Nebraska, 2018Every mesoscale discussion in 2018

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.