Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1855

August 4, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2011, 1:18 PM MDT for 4 states. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 4, 2011, 1:18 PM MDT (19:18 UTC)
Expired: Aug 4, 2011, 2:45 PM MDT
In force: 87 min
Issued by: the Storm Prediction Center

All 32 counties

Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Goshen County, WY, Platte County, WY

The radar

The Goodland radar (KGLD), 119 km from the middle of the area, began a volume at 19:19 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

Denver, CO (KDNR), launched 12:00Z, 7.3 hours before the alert went out and 90 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: 2131 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 6 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
Aug 3, 9:36 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Chase, Chautauqua, Coffey, Dickinson and 10 more	54 min
Aug 4, 1:10 AM MDT	Mesoscale Discussion	SPC	Allen, Bourbon, Cherokee, Crawford, Labette, Linn and 1 more	80 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.