Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 954

June 30, 20189 counties in Colorado; 13 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2018, 1:03 PM MDT for 9 counties in Colorado; 13 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2018, 1:03 PM MDT (19:03 UTC)
Expired
Jun 30, 2018, 2:30 PM MDT
In force
87 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 25 counties

Adams County, CO, Broomfield County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 58 km from the middle of the area, began a volume at 19:04 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 (KDEN), launched 12:00Z, 7.1 hours before the alert went out and 168 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 2018-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 189 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 2018-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 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
189 J/kg
Mixed-layer CIN
-224 J/kg
Mixed-layer LCL
806 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
-44 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 2:03 PM MDTSevere Thunderstorm WatchSPCAdams, Arapahoe, Douglas, Elbert, El Paso, Lincoln and 6 more7 hr
Jun 30, 4:40 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Denver, Douglas, Elbert, El Paso and 9 more2 hr
Jun 30, 5:09 PM MDTSevere Thunderstorm WatchSPCCheyenne, Kit Carson, Yuma7 hr
Jun 29, 8:37 PM MDTMesoscale DiscussionSPCFranklin, Furnas, Gosper, Harlan, Kearney, Phelps and 2 more113 min
Jun 30, 12:35 AM MDTMesoscale DiscussionSPCAntelope, Arthur, Banner, Blaine, Brown, Garden and 12 more85 min
Jun 30, 11:40 AM MDTMesoscale DiscussionSPCBoone, Burt, Butler, Clay, Colfax, Cuming and 19 more3 hr
Jun 30, 12:39 PM MDTSevere Thunderstorm WatchSPCBurt, Butler, Cass, Dodge, Douglas, Gage and 12 more7 hr
Jun 30, 2:11 PM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Chase, Clay, Custer and 29 more94 min
Jun 30, 2:26 PM MDTSevere Thunderstorm WatchSPCAdams, Arthur, Blaine, Buffalo, Chase, Cherry and 39 more8 hr
Jun 30, 2:40 PM MDTMesoscale DiscussionSPCCass, Dodge, Douglas, Lancaster, Otoe, Sarpy and 3 more2 hr
Jun 30, 3:40 PM MDTMesoscale DiscussionSPCNemaha, Pawnee, Richardson95 min
Jun 30, 5:09 PM MDTMesoscale DiscussionSPCAdams, Arthur, Blaine, Buffalo, Butler, Cass and 46 more96 min

Nearby

Mesoscale Discussions in Nebraska, 2018Mesoscale Discussions in Colorado, 2018Mesoscale Discussions in Wyoming, 2018Every mesoscale discussion in 2018

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.