Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 658

June 6, 20184 counties in Colorado; 16 counties in Kansas; 19 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2018, 10:58 PM MDT for 4 counties in Colorado; 16 counties in Kansas; 19 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 6, 2018, 10:58 PM MDT (04:58 UTC)
Expired: Jun 7, 2018, 1:00 AM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 39 counties

Kit Carson County, CO, Phillips County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Jewell County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Trego County, KS, Adams County, NE, Buffalo County, NE, Chase County, NE, Dawson County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Kearney County, NE, Lincoln County, NE, Nuckolls County, NE, Phelps County, NE, Red Willow County, NE, Webster County, NE

The radar

The Goodland radar (KGLD), 126 km from the middle of the area, began a volume at 04:57 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 159Jun 7, 1:25 AM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.0 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: 2094 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 2401 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 87 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 6, 6:59 PM MDT	Mesoscale Discussion	SPC	Phillips, Sedgwick, Yuma	2 hr
Jun 6, 7:45 PM MDT	Mesoscale Discussion	SPC	Brown, Marshall, Nemaha, Republic, Washington	90 min
Jun 7, 12:58 AM MDT	Mesoscale Discussion	SPC	Barber, Barton, Clark, Cloud, Comanche, Edwards and 31 more	92 min
Jun 7, 1:25 AM MDT	Severe Thunderstorm Watch	SPC	Barber, Barton, Comanche, Edwards, Ellis, Ellsworth and 22 more	5 hr
Jun 7, 3:35 AM MDT	Mesoscale Discussion	SPC	Barber, Cloud, Comanche, Ellsworth, Harper, Harvey and 17 more	85 min

Nearby

Mesoscale Discussions in Nebraska, 2018 Mesoscale Discussions in Kansas, 2018 Mesoscale Discussions in Colorado, 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.