Alert archive / Nebraska / Mesoscale Discussions in 2018

Mesoscale Discussion 1194

July 29, 20185 states

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2018, 12:46 PM MDT for 5 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Jul 29, 2018, 12:46 PM MDT (18:46 UTC)
Expired
Jul 29, 2018, 1:45 PM MDT
In force
59 min
Issued by
the Storm Prediction Center
Chance of a watch
95%
All 44 counties

Adams County, CO, Arapahoe County, CO, Broomfield County, CO, Cheyenne County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Rawlins County, KS, Sherman County, KS, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hitchcock County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 96 km from the middle of the area, began a volume at 18:46 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, 6.8 hours before the alert went out and 173 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 2018-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 181 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, Denver, CO at 12:00Z on 2018-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
181 J/kg
Mixed-layer CIN
-407 J/kg
Mixed-layer LCL
1180 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
208 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 29, 1:07 PM MDTTornado WatchSPCAdams, Arapahoe, Cheyenne, Crowley, Elbert, El Paso and 12 more8 hr
Jul 29, 5:23 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Bent, Broomfield, Cheyenne, Crowley and 19 more67 min
Jul 28, 9:46 PM MDTMesoscale DiscussionSPCDecatur, Gove, Graham, Logan, Norton, Rawlins and 2 more89 min
Jul 28, 10:10 PM MDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Finney and 12 more2 hr
Jul 29, 12:59 AM MDTSevere Thunderstorm WatchSPCBarber, Barton, Butler, Chase, Chautauqua, Cowley and 15 more5 hr
Jul 29, 3:00 AM MDTMesoscale DiscussionSPCButler, Chautauqua, Cowley, Harper, Harvey, Sedgwick and 1 more2 hr
Jul 29, 1:34 PM MDTSevere Thunderstorm WatchSPCCheyenne, Gove, Logan, Rawlins, Sheridan, Thomas and 1 more7 hr
Jul 29, 4:07 PM MDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Lane, Logan, Rawlins and 5 more53 min
Jul 28, 6:38 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Kimball, Morrill, Scotts Bluff and 1 more97 min
Jul 29, 1:12 PM MDTMesoscale DiscussionSPCButte, Lawrence2 hr
Jul 29, 2:20 PM MDTMesoscale DiscussionSPCLaramie55 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.