Alert archive / Nebraska / Mesoscale Discussions in 2014

Mesoscale Discussion 1534

August 9, 20149 counties in Nebraska; Fall River County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2014, 4:08 PM MDT for 9 counties in Nebraska; Fall River County, South Dakota. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Aug 9, 2014, 4:08 PM MDT (22:08 UTC)
Expired: Aug 9, 2014, 5:15 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Garden County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Fall River County, SD

The radar

The Cheyenne radar (KCYS), 179 km from the middle of the area, began a volume at 22:10 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 (KRAP), launched 12:00Z, 10.1 hours before the alert went out and 218 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: 1584 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 8, 6:48 PM MDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Buffalo, Chase, Custer, Dawson and 22 more	5 hr
Aug 8, 8:26 PM MDT	Mesoscale Discussion	SPC	Antelope, Boone, Buffalo, Custer, Dawson, Frontier and 16 more	94 min
Aug 8, 10:48 PM MDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Franklin and 17 more	87 min
Aug 9, 1:46 PM MDT	Mesoscale Discussion	SPC	Adams, Blaine, Buffalo, Chase, Custer, Dawson and 24 more	119 min
Aug 9, 2:03 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arthur, Blaine, Brown, Buffalo, Chase and 42 more	9 hr
Aug 9, 5:40 PM MDT	Mesoscale Discussion	SPC	Adams, Arthur, Blaine, Brown, Buffalo, Chase and 33 more	95 min
Aug 9, 4:18 PM MDT	Mesoscale Discussion	SPC	Brookings, Codington, Deuel, Grant, Hamlin	117 min

Nearby

Mesoscale Discussions in Nebraska, 2014 Mesoscale Discussions in South Dakota, 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.