Alert archive / Nebraska / Mesoscale Discussions in 2012

Mesoscale Discussion 1225

June 19, 201213 counties in Nebraska; 7 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2012, 7:50 PM MDT for 13 counties in Nebraska; 7 counties in South Dakota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2012, 7:50 PM MDT (01:50 UTC)
Expired: Jun 19, 2012, 9:15 PM MDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Arthur County, NE, Box Butte County, NE, Cherry County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keya Paha County, NE, McPherson County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Fall River County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 110 km from the middle of the area, began a volume at 01:50 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.8 hours before the alert went out and 183 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: 2151 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 2585 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 1 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
Jun 19, 6:01 PM MDT	Severe Thunderstorm Watch	SPC	Antelope, Blaine, Boyd, Brown, Cedar, Custer and 15 more	7 hr
Jun 19, 10:59 PM MDT	Mesoscale Discussion	SPC	Box Butte, Dawes, Garden, Grant, Morrill, Sheridan	91 min
Jun 19, 11:57 PM MDT	Severe Thunderstorm Watch	SPC	Blaine, Boyd, Brown, Cherry, Garden, Grant and 7 more	3 hr
Jun 20, 3:00 AM MDT	Mesoscale Discussion	SPC	Arthur, Blaine, Boyd, Brown, Cherry, Garden and 8 more	60 min
Jun 20, 2:24 PM MDT	Mesoscale Discussion	SPC	Adams, Burt, Butler, Cass, Clay, Dodge and 21 more	96 min
Jun 19, 8:12 PM MDT	Mesoscale Discussion	SPC	Brookings, Deuel, Grant, Hamlin, Kingsbury, Lake and 3 more	93 min
Jun 19, 10:20 PM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brookings, Brule, Buffalo, Charles Mix and 25 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2012 Mesoscale Discussions in South Dakota, 2012 Every mesoscale discussion in 2012

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.