Alert archive / Nebraska / Mesoscale Discussions in 2012

Mesoscale Discussion 1141

June 12, 2012Phillips County, Sedgwick County, Colorado; 17 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2012, 1:23 PM MDT for Phillips County, Sedgwick County, Colorado; 17 counties in Nebraska; 6 counties in South Dakota. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 12, 2012, 1:23 PM MDT (19:23 UTC)
Expired: Jun 12, 2012, 2:30 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 25 counties

Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Sheridan County, NE, Bennett County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Oglala Lakota County, SD, Pennington County, SD

The radar

The North Platte radar (KLNX), 141 km from the middle of the area, began a volume at 19:22 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 12:00Z, 7.4 hours before the alert went out and 181 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: 1808 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 265 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 12, 1:02 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Las Animas, Otero, Prowers	88 min
Jun 12, 1:16 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Crowley, Kiowa, Las Animas, Otero and 1 more	8 hr
Jun 12, 4:42 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Crowley, Kiowa, Las Animas, Otero and 2 more	63 min

Nearby

Mesoscale Discussions in Nebraska, 2012 Mesoscale Discussions in South Dakota, 2012 Mesoscale Discussions in Colorado, 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.