Alert archive / Nebraska / Mesoscale Discussions in 2015

Mesoscale Discussion 1179

June 25, 20155 counties in Colorado; Cheyenne County, Decatur County, Rawlins County, Kansas; 20 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2015, 5:22 PM MDT for 5 counties in Colorado; Cheyenne County, Decatur County, Rawlins County, Kansas; 20 counties in Nebraska. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jun 25, 2015, 5:22 PM MDT (23:22 UTC)
Expired: Jun 25, 2015, 6:45 PM MDT
In force: 83 min
Issued by: the Storm Prediction Center

All 28 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Rawlins County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE

The radar

The North Platte radar (KLNX), 157 km from the middle of the area, began a volume at 23:23 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 357Jun 25, 8:50 PM MDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.4 hours before the alert went out and 118 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: 150 J/kg
Mixed-layer CIN: -558 J/kg
Mixed-layer LCL: 1229 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -91 m²/s²
0-3 km storm-relative helicity: 9 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 25, 2:10 PM MDT	Mesoscale Discussion	SPC	Logan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more	65 min
Jun 25, 2:30 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 10 more	8 hr
Jun 25, 4:25 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 10 more	95 min
Jun 25, 3:52 PM MDT	Mesoscale Discussion	SPC	Dickinson, Douglas, Franklin, Geary, Jackson, Jefferson and 10 more	113 min
Jun 25, 4:53 PM MDT	Severe Thunderstorm Watch	SPC	Atchison, Doniphan, Johnson, Leavenworth, Wyandotte	9 hr
Jun 25, 12:57 AM MDT	Mesoscale Discussion	SPC	Dawes, Sheridan, Sioux	93 min
Jun 25, 10:58 AM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 8 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2015 Mesoscale Discussions in Colorado, 2015 Mesoscale Discussions in Kansas, 2015 Every mesoscale discussion in 2015

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.