Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1937

August 10, 20117 counties in Colorado; 11 counties in Kansas; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2011, 5:54 PM MDT for 7 counties in Colorado; 11 counties in Kansas; 25 counties in Nebraska. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Aug 10, 2011, 5:54 PM MDT (23:54 UTC)
Expired
Aug 10, 2011, 7:00 PM MDT
In force
66 min
Issued by
the Storm Prediction Center
All 43 counties

Cheyenne County, CO, Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE, Thomas County, NE

The radar

The Goodland radar (KGLD), 107 km from the middle of the area, began a volume at 23:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.9 hours before the alert went out and 110 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, Denver, CO at 12:00Z on 2011-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 463 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2011-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.1939587897Sfc1 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
463 J/kg
Mixed-layer CIN
-286 J/kg
Mixed-layer LCL
728 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
109 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.

IssuedProductOfficeCountiesLasted
Aug 9, 8:26 PM MDTMesoscale DiscussionSPCLogan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more64 min
Aug 9, 8:51 PM MDTSevere Thunderstorm WatchSPCCheyenne, Kit Carson, Logan, Phillips, Sedgwick, Washington and 1 more7 hr
Aug 10, 3:42 PM MDTMesoscale DiscussionSPCLogan, Phillips, Sedgwick63 min
Aug 10, 4:03 PM MDTSevere Thunderstorm WatchSPCLogan, Phillips, Sedgwick, Washington6 hr
Aug 9, 7:27 PM MDTMesoscale DiscussionSPCClark, Comanche, Kiowa, Meade, Seward2 hr
Aug 9, 10:11 PM MDTMesoscale DiscussionSPCBarber, Barton, Butler, Chautauqua, Cowley, Edwards and 28 more94 min
Aug 10, 2:25 AM MDTMesoscale DiscussionSPCBarton, Butler, Cowley, Ellis, Ellsworth, Greenwood and 12 more65 min
Aug 10, 2:42 AM MDTSevere Thunderstorm WatchSPCBarton, Butler, Chase, Chautauqua, Cowley, Elk and 17 more3 hr
Aug 10, 2:53 AM MDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Rawlins, Sheridan, Sherman and 1 more67 min

Nearby

Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in Kansas, 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.