Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 617

June 1, 201818 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2018, 7:08 PM CDT for 18 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 1, 2018, 7:08 PM CDT (00:08 UTC)
Expired: Jun 1, 2018, 9:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Adams County, NE, Boyd County, NE, Buffalo County, NE, Clay County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Loup County, NE, Merrick County, NE, Nance County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 144 km from the middle of the area, began a volume at 00:09 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 148Jun 1, 10:00 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.1 hours before the alert went out and 154 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: 1982 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 2223 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.1

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
Jun 1, 9:32 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Butler, Clay and 32 more	118 min
Jun 1, 10:05 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Boone, Buffalo, Burt, Butler, Cass and 45 more	5 hr
Jun 2, 12:50 AM CDT	Mesoscale Discussion	SPC	Gage, Johnson, Nemaha, Otoe, Pawnee, Richardson	55 min

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.