Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1197

June 12, 20115 counties in Colorado; Cheyenne County, Kansas; 17 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2011, 3:53 PM MDT for 5 counties in Colorado; Cheyenne County, Kansas; 17 counties in Nebraska. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2011, 3:53 PM MDT (21:53 UTC)
Expired: Jun 12, 2011, 5:00 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

All 23 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne 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, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 156 km from the middle of the area, began a volume at 21:57 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 nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 9.9 hours before the alert went out and 327 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: 15 J/kg
Mixed-layer CIN: -237 J/kg
Mixed-layer LCL: 1880 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 48 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 11, 6:07 PM MDT	Mesoscale Discussion	SPC	Cheyenne, Kiowa, Kit Carson, Lincoln, Logan, Morgan and 4 more	53 min
Jun 11, 8:37 PM MDT	Mesoscale Discussion	SPC	Barber, Clark, Comanche, Edwards, Harper, Harvey and 9 more	53 min
Jun 12, 12:52 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Garden, Morrill and 3 more	53 min

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Colorado, 2011 Mesoscale Discussions in Kansas, 2011 Every mesoscale discussion in 2011

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.