Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 819

June 4, 20144 counties in Colorado; Cheyenne County, Rawlins County, Kansas; 21 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 4:41 PM MDT for 4 counties in Colorado; Cheyenne County, Rawlins County, Kansas; 21 counties in Nebraska. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2014, 4:41 PM MDT (22:41 UTC)
Expired: Jun 4, 2014, 5:45 PM MDT
In force: 64 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 27 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Rawlins County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE

The radar

The North Platte radar (KLNX), 153 km from the middle of the area, began a volume at 22:46 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.

Severe Thunderstorm Watch 221Jun 4, 5:15 PM MDT

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.7 hours before the alert went out and 197 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: 39 J/kg
Mixed-layer CIN: -244 J/kg
Mixed-layer LCL: 1718 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 4, 5:12 PM MDT	Severe Thunderstorm Watch	SPC	Cheyenne, Kit Carson, Lincoln, Logan, Morgan, Phillips and 4 more	8 hr
Jun 3, 8:20 PM MDT	Tornado Watch	SPC	Brown, Jackson, Jefferson, Marshall, Nemaha	4 hr
Jun 3, 8:41 PM MDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 2 more	64 min
Jun 3, 11:28 PM MDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Leavenworth, Marshall and 1 more	62 min
Jun 3, 11:50 PM MDT	Severe Thunderstorm Watch	SPC	Atchison, Brown, Doniphan, Jackson, Jefferson, Johnson and 4 more	3 hr
Jun 3, 6:04 PM MDT	Mesoscale Discussion	SPC	Adams, Blaine, Boone, Buffalo, Butler, Cass and 34 more	56 min
Jun 4, 12:58 PM MDT	Mesoscale Discussion	SPC	Dawes, Sioux	92 min

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in Colorado, 2014 Mesoscale Discussions in Kansas, 2014 Every mesoscale discussion in 2014

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.