Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1282

June 18, 20117 counties in Colorado; 14 counties in Kansas; 16 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2011, 4:15 PM MDT for 7 counties in Colorado; 14 counties in Kansas; 16 counties in Nebraska. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jun 18, 2011, 4:15 PM MDT (22:15 UTC)
Expired
Jun 18, 2011, 5:45 PM MDT
In force
90 min
Issued by
the Storm Prediction Center
All 37 counties

Cheyenne County, CO, Kiowa County, CO, Kit Carson County, CO, Phillips County, CO, Prowers County, CO, Sedgwick County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Greeley County, KS, Hamilton County, KS, Kearny County, KS, Logan County, KS, Rawlins County, KS, Scott County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Arthur County, NE, Chase County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE

The radar

The Goodland radar (KGLD), 33 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 127 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 2011-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 110 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 2011-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.19395878Sfc1 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
110 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
1171 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
52 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
Jun 17, 7:27 PM MDTMesoscale DiscussionSPCBent, Cheyenne, Crowley, Kiowa, Lincoln, Prowers93 min
Jun 18, 11:45 AM MDTMesoscale DiscussionSPCAdams, Arapahoe, Cheyenne, Elbert, Kit Carson, Lincoln and 7 more2 hr
Jun 18, 12:31 PM MDTSevere Thunderstorm WatchSPCBent, Cheyenne, Crowley, Elbert, El Paso, Kiowa and 11 more7 hr
Jun 17, 7:19 PM MDTSevere Thunderstorm WatchSPCAllen, Anderson, Atchison, Barton, Bourbon, Brown and 67 more7 hr
Jun 17, 10:12 PM MDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chase, Clay and 45 more93 min
Jun 18, 1:07 AM MDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Barton, Bourbon, Brown and 49 more53 min
Jun 18, 2:34 PM MDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chautauqua, Cherokee and 10 more116 min
Jun 18, 4:36 PM MDTSevere Thunderstorm WatchSPCDecatur, Edwards, Ellis, Finney, Ford, Gove and 20 more7 hr
Jun 18, 5:03 PM MDTSevere Thunderstorm WatchSPCAllen, Anderson, Bourbon, Butler, Chautauqua, Cherokee and 20 more10 hr
Jun 17, 6:09 PM MDTSevere Thunderstorm WatchSPCBurt, Cass, Cuming, Dakota, Dodge, Douglas and 6 more3 hr

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.