Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 773

June 17, 20189 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2018, 5:47 PM CDT for 9 counties in Nebraska; 6 counties in South Dakota. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2018, 5:47 PM CDT (22:47 UTC)
Expired: Jun 17, 2018, 7:45 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Holt County, NE, Knox County, NE, Logan County, NE, Loup County, NE, Rock County, NE, Thomas County, NE, Bon Homme County, SD, Hanson County, SD, Hutchinson County, SD, McCook County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 165 km from the middle of the area, began a volume at 22:46 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.8 hours before the alert went out and 225 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: 74 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 840 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: -1 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.

Issued	Product	Office	Counties	Lasted
Jun 16, 7:59 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cherry, Cheyenne, Dawes, Garden and 5 more	91 min
Jun 16, 9:50 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cherry, Dawes, Grant, Morrill and 2 more	85 min
Jun 17, 2:05 PM CDT	Mesoscale Discussion	SPC	Blaine, Chase, Custer, Deuel, Dundy, Frontier and 7 more	85 min
Jun 17, 2:35 PM CDT	Tornado Watch	SPC	Arthur, Blaine, Chase, Custer, Deuel, Dundy and 12 more	7 hr
Jun 17, 3:52 PM CDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Cedar, Colfax, Cuming and 17 more	53 min
Jun 17, 4:53 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Cheyenne, Deuel, Dundy, Garden and 9 more	97 min
Jun 17, 6:47 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Deuel, Hayes, Hooker, Keith and 5 more	88 min
Jun 16, 9:01 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Clark, Codington, Day, Deuel and 6 more	119 min
Jun 16, 10:17 PM CDT	Mesoscale Discussion	SPC	Beadle, Brookings, Brown, Clark, Codington, Day and 7 more	88 min

Nearby

Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in South Dakota, 2018 Every 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.