Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 609

June 1, 201848 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2018, 2:56 PM CDT for 48 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 1, 2018, 2:56 PM CDT (19:56 UTC)
Expired: Jun 1, 2018, 5:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 95%

All 48 counties

Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Buffalo County, NE, Butler County, NE, Cherry County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Kearney County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE, York County, NE

The radar

The North Platte radar (KLNX), 125 km from the middle of the area, began a volume at 19:55 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.

Tornado Watch 147Jun 1, 3:55 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.9 hours before the alert went out and 102 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: 998 J/kg
Mixed-layer CIN: -296 J/kg
Mixed-layer LCL: 1653 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 312 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 1, 3:57 PM CDT	Tornado Watch	SPC	Adams, Antelope, Blaine, Boone, Boyd, Brown and 43 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 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.