Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1256

June 16, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 16, 2011, 7:26 PM MDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jun 16, 2011, 7:26 PM MDT (01:26 UTC)
Expired
Jun 16, 2011, 8:30 PM MDT
In force
64 min
Issued by
the Storm Prediction Center
All 39 counties

Logan County, CO, Morgan County, CO, Sedgwick County, CO, Weld County, CO, Arthur County, NE, Banner County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Cheyenne County, NE, Custer County, NE, Deuel County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Rock County, NE, Scotts Bluff County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Charles Mix County, SD, Gregory County, SD, Lyman County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD, Laramie County, WY

The radar

The North Platte radar (KLNX), 123 km from the middle of the area, began a volume at 01:26 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, 1.4 hours before the alert went out and 149 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-pSkew-T log-p diagram, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1720 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 00:00Z on 2011-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1720 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
1441 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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.

IssuedProductOfficeCountiesLasted
Jun 17, 12:17 PM MDTMesoscale DiscussionSPCArapahoe, Cheyenne, Crowley, Elbert, El Paso, Kiowa and 2 more88 min
Jun 17, 12:58 PM MDTSevere Thunderstorm WatchSPCAdams, Arapahoe, Bent, Cheyenne, Crowley, Denver and 11 more9 hr
Jun 17, 4:59 PM MDTMesoscale DiscussionSPCCheyenne, Crowley, Elbert, El Paso, Kiowa, Kit Carson and 2 more61 min
Jun 17, 5:23 PM MDTSevere Thunderstorm WatchSPCCheyenne, Kit Carson8 hr
Jun 16, 8:13 PM MDTMesoscale DiscussionSPCAdams, Chase, Dawson, Dundy, Franklin, Frontier and 12 more92 min
Jun 16, 10:03 PM MDTSevere Thunderstorm WatchSPCAntelope, Boone, Burt, Butler, Cass, Cedar and 24 more5 hr
Jun 16, 10:10 PM MDTMesoscale DiscussionSPCAdams, Buffalo, Clay, Custer, Dawson, Franklin and 14 more65 min
Jun 17, 5:44 PM MDTMesoscale DiscussionSPCBurt, Butler, Cass, Cuming, Dakota, Dodge and 17 more91 min
Jun 17, 3:51 PM MDTMesoscale DiscussionSPCClark, Codington, Day, Deuel, Grant, Hamlin and 2 more84 min
Jun 17, 4:34 PM MDTTornado WatchSPCCodington, Day, Deuel, Grant, Hamlin, Marshall and 1 more5 hr

Nearby

Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in South Dakota, 2011Mesoscale Discussions in Colorado, 2011Every 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.