Alert archive / Nebraska / Mesoscale Discussions in 2017

Mesoscale Discussion 1805

December 23, 2017Logan County, Phillips County, Sedgwick County, Colorado; 27 counties in Nebraska; Goshen County, Laramie County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Dec 23, 2017, 1:48 PM MST for Logan County, Phillips County, Sedgwick County, Colorado; 27 counties in Nebraska; Goshen County, Laramie County, Wyoming. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Dec 23, 2017, 1:48 PM MST (20:48 UTC)
Expired: Dec 23, 2017, 7:15 PM MST
In force: 5 hr
Issued by: the Storm Prediction Center

All 32 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Banner County, NE, Buffalo County, NE, Chase County, NE, Cheyenne County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Gosper County, NE, Grant County, NE, Hall County, NE, Hayes County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Phelps County, NE, Scotts Bluff County, NE, Sherman County, NE, Valley County, NE, Goshen County, WY, Laramie County, WY

The radar

The North Platte radar (KLNX), 114 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 84 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 823 m above ground
0-6 km bulk shear: 96 kt
0-1 km storm-relative helicity: 146 m²/s²
0-3 km storm-relative helicity: 469 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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Nearby

Mesoscale Discussions in Nebraska, 2017 Mesoscale Discussions in Colorado, 2017 Mesoscale Discussions in Wyoming, 2017 Every mesoscale discussion in 2017

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.