Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 550

May 28, 201817 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 28, 2018, 5:23 AM CDT for 17 counties in Nebraska. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2018, 5:23 AM CDT (10:23 UTC)
Expired: May 28, 2018, 8:00 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Blaine County, NE, Brown County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Gosper County, NE, Hayes County, NE, Hooker County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 80 km from the middle of the area, began a volume at 10:25 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 00:00Z, 10.4 hours before the alert went out and 43 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: 1544 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 2523 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 164 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
May 27, 8:31 PM CDT	Mesoscale Discussion	SPC	Arthur, Box Butte, Chase, Cherry, Dawes, Deuel and 14 more	119 min
May 28, 2:12 PM CDT	Tornado Watch	SPC	Dundy, Nuckolls, Webster	8 hr
May 28, 2:39 PM CDT	Mesoscale Discussion	SPC	Banner, Kimball	96 min
May 28, 3:01 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Kimball, Scotts Bluff, Sioux	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.