Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1547

July 8, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 8, 2011, 7:57 PM MDT for 4 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 8, 2011, 7:57 PM MDT (01:57 UTC)
Expired: Jul 8, 2011, 9:00 PM MDT
In force: 63 min
Issued by: the Storm Prediction Center

All 30 counties

Cheyenne County, CO, Kit Carson County, CO, Lincoln County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Dundy County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Perkins County, NE, Bennett County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Jackson County, SD

The radar

The North Platte radar (KLNX), 148 km from the middle of the area, began a volume at 01:56 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, 2.0 hours before the alert went out and 151 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: 1154 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1374 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.0

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
Jul 9, 1:52 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Crowley, Elbert, Kiowa and 6 more	53 min
Jul 9, 2:13 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Denver and 16 more	8 hr
Jul 9, 4:56 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Denver and 15 more	94 min
Jul 9, 4:25 PM MDT	Severe Thunderstorm Watch	SPC	Finney, Grant, Hamilton, Haskell, Kearny, Morton and 4 more	6 hr
Jul 8, 9:37 PM MDT	Mesoscale Discussion	SPC	Marshall, Roberts	83 min
Jul 8, 10:20 PM MDT	Mesoscale Discussion	SPC	Beadle, Brule, Buffalo, Hand, Hughes, Hyde and 2 more	85 min
Jul 9, 5:09 PM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Charles Mix and 15 more	66 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.