Alert archive / Nebraska / Mesoscale Discussions in 2016

Mesoscale Discussion 1632

September 4, 20164 states

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2016, 1:46 PM MDT for 4 states. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Sep 4, 2016, 1:46 PM MDT (19:46 UTC)
Expired: Sep 4, 2016, 3:45 PM MDT
In force: 119 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 41 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Rawlins County, KS, Arthur County, NE, Blaine County, NE, Box Butte County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 96 km from the middle of the area, began a volume at 19:46 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.8 hours before the alert went out and 80 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: 89 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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
Sep 3, 7:47 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Yuma	118 min
Sep 3, 9:48 PM MDT	Mesoscale Discussion	SPC	Yuma	117 min
Sep 4, 1:54 PM MDT	Mesoscale Discussion	SPC	Cheyenne	2 hr
Sep 4, 2:24 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and 1 more	7 hr
Sep 4, 5:07 PM MDT	Mesoscale Discussion	SPC	Kit Carson, Logan, Phillips, Sedgwick, Yuma	113 min
Sep 4, 3:01 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Edmunds and 13 more	89 min
Sep 4, 3:53 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Campbell and 23 more	7 hr
Sep 4, 5:56 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Clark and 25 more	94 min

Nearby

Mesoscale Discussions in Nebraska, 2016 Mesoscale Discussions in South Dakota, 2016 Mesoscale Discussions in Colorado, 2016 Every mesoscale discussion in 2016

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.