Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 1185

June 29, 2017Plymouth County, Iowa; 32 counties in Nebraska; 8 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2017, 2:26 PM CDT for Plymouth County, Iowa; 32 counties in Nebraska; 8 counties in South Dakota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 29, 2017, 2:26 PM CDT (19:26 UTC)
Expired: Jun 29, 2017, 4:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 41 counties

Plymouth County, IA, Antelope County, NE, Boone County, NE, Boyd County, NE, Buffalo County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Frontier County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Gregory County, SD, Hutchinson County, SD, Union County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 155 km from the middle of the area, began a volume at 19:27 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.

Severe Thunderstorm Watch 381Jun 29, 3:40 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.4 hours before the alert went out and 170 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: 85 J/kg
Mixed-layer CIN: -378 J/kg
Mixed-layer LCL: 2290 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 210 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 28, 7:53 PM CDT	Mesoscale Discussion	SPC	Clinton, Dubuque, Jackson, Jones, Linn	97 min
Jun 28, 8:39 PM CDT	Mesoscale Discussion	SPC	Decatur, Ringgold, Taylor	96 min
Jun 29, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 18 more	8 hr
Jun 29, 3:48 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Buchanan, Butler, Clayton, Delaware and 7 more	117 min
Jun 29, 6:08 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Carroll, Cass, Cherokee, Clay and 13 more	67 min
Jun 29, 12:47 AM CDT	Mesoscale Discussion	SPC	Franklin, Furnas, Harlan, Nuckolls, Webster	58 min
Jun 29, 1:22 AM CDT	Severe Thunderstorm Watch	SPC	Franklin, Harlan, Nuckolls, Thayer, Webster	8 hr

Nearby

Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in South Dakota, 2017 Mesoscale Discussions in Iowa, 2017 Every mesoscale discussion in 2017

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.