Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 658

May 16, 201315 counties in Nebraska; Bon Homme County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 16, 2013, 1:25 PM CDT for 15 counties in Nebraska; Bon Homme County, South Dakota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 16, 2013, 1:25 PM CDT (18:25 UTC)
Expired: May 16, 2013, 3:00 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Antelope County, NE, Boone County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dixon County, NE, Greeley County, NE, Knox County, NE, Madison County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Stanton County, NE, Thurston County, NE, Wayne County, NE, Bon Homme County, SD

The radar

The Omaha radar (KOAX), 133 km from the middle of the area, began a volume at 18:27 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

Omaha, NE (KOAX), launched 12:00Z, 6.4 hours before the alert went out and 132 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: 65 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: -12 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
May 16, 12:59 PM CDT	Mesoscale Discussion	SPC	Chase, Cheyenne, Deuel, Dundy, Frontier, Hayes and 3 more	2 hr
May 16, 1:51 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Chase, Custer, Dawson, Dundy and 15 more	6 hr
May 16, 3:12 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	93 min
May 16, 3:35 PM CDT	Mesoscale Discussion	SPC	Custer, Dawson, Frontier, Furnas, Gosper, Harlan and 5 more	85 min
May 16, 6:30 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Boone, Buffalo, Clay, Colfax and 19 more	90 min

Nearby

Mesoscale Discussions in Nebraska, 2013 Mesoscale Discussions in South Dakota, 2013 Every mesoscale discussion in 2013

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.