Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 547

May 27, 201816 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 27, 2018, 5:41 PM MDT for 16 counties in Nebraska. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 27, 2018, 5:41 PM MDT (23:41 UTC)
Expired: May 27, 2018, 7:15 PM MDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 112 km from the middle of the area, began a volume at 23:42 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 12:00Z, 11.7 hours before the alert went out and 107 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: 597 J/kg
Mixed-layer CIN: -524 J/kg
Mixed-layer LCL: 2192 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -144 m²/s²
0-3 km storm-relative helicity: -96 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, 12:05 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	9 hr
May 27, 1:13 PM MDT	Severe Thunderstorm Watch	SPC	Dundy, Hitchcock, Red Willow	7 hr
May 27, 2:40 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Chase, Cherry, Deuel, Frontier, Garden and 10 more	6 hr
May 27, 4:30 PM MDT	Mesoscale Discussion	SPC	Dundy	2 hr
May 27, 4:42 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Dawes, Kimball, Morrill, Scotts Bluff and 1 more	93 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.