Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 1216

July 2, 201741 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2017, 3:16 PM CDT for 41 counties in Nebraska. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Jul 2, 2017, 3:16 PM CDT (20:16 UTC)
Expired: Jul 2, 2017, 5:15 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 41 counties

Adams County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Box Butte County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Merrick County, NE, Morrill County, NE, Nance County, NE, Perkins County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 68 km from the middle of the area, began a volume at 20:16 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 390Jul 2, 6:00 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.3 hours before the alert went out and 25 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: 535 J/kg
Mixed-layer CIN: -338 J/kg
Mixed-layer LCL: 1509 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Jul 2, 5:58 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Chase, Cherry, Custer, Dawson, Deuel and 19 more	6 hr

Nearby

Mesoscale Discussions in Nebraska, 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.