Alert archive / South Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 868

June 2, 201523 counties in Nebraska; 25 counties in South Dakota; Weston County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 2, 2015, 8:01 PM MDT for 23 counties in Nebraska; 25 counties in South Dakota; Weston County, Wyoming. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jun 2, 2015, 8:01 PM MDT (02:01 UTC)
Expired
Jun 2, 2015, 9:30 PM MDT
In force
89 min
Issued by
the Storm Prediction Center
All 49 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Aurora County, SD, Bennett County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Custer County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, Meade County, SD, Mellette County, SD, Oglala Lakota County, SD, Pennington County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Weston County, WY

The radar

The North Platte radar (KLNX), 130 km from the middle of the area, began a volume at 02:03 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.0 hours before the alert went out and 198 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, N. Platte/Lee Bi, NE at 00:00Z on 2015-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1700 joules per kilogram.LCLLFCEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 00:00Z on 2015-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.193958Sfc1 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
1700 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
1604 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
101 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.

IssuedProductOfficeCountiesLasted
Jun 2, 8:25 PM MDTSevere Thunderstorm WatchSPCBlaine, Boyd, Brown, Buffalo, Custer, Dawson and 14 more5 hr
Jun 2, 10:57 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Custer, Garfield, Greeley and 8 more2 hr
Jun 3, 12:03 AM MDTSevere Thunderstorm WatchSPCAdams, Buffalo, Clay, Dawson, Fillmore, Greeley and 11 more3 hr
Jun 3, 2:01 AM MDTMesoscale DiscussionSPCAdams, Antelope, Arthur, Blaine, Boone, Boyd and 66 more89 min
Jun 3, 12:34 PM MDTMesoscale DiscussionSPCBanner, Kimball, Scotts Bluff86 min
Jun 3, 2:03 PM MDTTornado WatchSPCBanner, Kimball, Scotts Bluff, Sioux7 hr
Jun 3, 3:05 PM MDTMesoscale DiscussionSPCFranklin, Furnas, Harlan, Webster115 min
Jun 3, 5:33 PM MDTTornado WatchSPCAdams, Clay, Fillmore, Franklin, Furnas, Gage and 11 more7 hr

Nearby

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