Alert archive / Nebraska / Mesoscale Discussions in 2013

Mesoscale Discussion 1165

June 21, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2013, 8:39 PM MDT for 4 states. It was in force for 36 min.

The area

The outline as issued.

The facts

Issued
Jun 21, 2013, 8:39 PM MDT (02:39 UTC)
Expired
Jun 21, 2013, 9:15 PM MDT
In force
36 min
Issued by
the Storm Prediction Center
All 21 counties

Logan County, CO, Phillips County, CO, Sedgwick County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Oglala Lakota County, SD, Pennington County, SD, Converse County, WY, Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 02:41 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

Rapid City, SD (KUNR), launched 00:00Z, 2.7 hours before the alert went out and 194 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, Rapid City, SD at 00:00Z on 2013-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 685 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, Rapid City, SD at 00:00Z on 2013-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
685 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
649 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.2

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 22, 12:11 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Logan, Morgan, Washington, Weld2 hr
Jun 22, 4:00 PM MDTMesoscale DiscussionSPCLogan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more90 min
Jun 22, 4:18 PM MDTTornado WatchSPCAdams, Arapahoe, Cheyenne, Elbert, Kit Carson, Lincoln and 7 more7 hr
Jun 22, 4:41 PM MDTMesoscale DiscussionSPCBaca64 min
Jun 21, 7:56 PM MDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Cherry, Holt, Hooker and 7 more94 min
Jun 21, 8:07 PM MDTSevere Thunderstorm WatchSPCAntelope, Blaine, Boone, Boyd, Cedar, Custer and 9 more5 hr
Jun 21, 9:25 PM MDTSevere Thunderstorm WatchSPCBuffalo, Dawson, Gosper, Greeley, Hall, Hamilton and 7 more3 hr
Jun 21, 11:42 PM MDTMesoscale DiscussionSPCArthur, Blaine, Brown, Cherry, Custer, Grant and 7 more93 min
Jun 22, 1:45 PM MDTMesoscale DiscussionSPCBanner, Box Butte, Dawes, Garden, Morrill, Scotts Bluff and 2 more90 min
Jun 22, 2:13 PM MDTTornado WatchSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more6 hr
Jun 22, 2:34 PM MDTMesoscale DiscussionSPCAdams, Blaine, Brown, Buffalo, Custer, Dawson and 15 more56 min
Jun 22, 4:56 PM MDTTornado WatchSPCAdams, Antelope, Arthur, Blaine, Boone, Buffalo and 52 more7 hr
Jun 22, 10:04 AM MDTMesoscale DiscussionSPCJohnson, Natrona, Washakie116 min
Jun 22, 10:59 AM MDTTornado WatchSPCAlbany, Big Horn, Campbell, Converse, Crook, Fremont and 9 more7 hr
Jun 22, 1:25 PM MDTMesoscale DiscussionSPCAlbany, Carbon, Converse, Fremont, Goshen, Laramie and 4 more2 hr

Nearby

Mesoscale Discussions in Nebraska, 2013Mesoscale Discussions in South Dakota, 2013Mesoscale Discussions in Colorado, 2013Every mesoscale discussion in 2013

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.