Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 816

June 4, 20145 states

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 12:58 PM MDT for 5 states. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jun 4, 2014, 12:58 PM MDT (18:58 UTC)
Expired
Jun 4, 2014, 2:30 PM MDT
In force
92 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 24 counties

Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Adams County, ND, Bowman County, ND, Slope County, ND, Dawes County, NE, Sioux County, NE, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Converse County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 157 km from the middle of the area, began a volume at 18:58 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

Rapid City, SD (KRAP), launched 12:00Z, 7.0 hours before the alert went out and 157 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 12:00Z on 2014-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 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 12:00Z on 2014-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 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
67 J/kg
Mixed-layer CIN
-269 J/kg
Mixed-layer LCL
950 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
2 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 3, 8:32 PM MDTMesoscale DiscussionSPCCuster, Powder River, Prairie, Rosebud58 min
Jun 4, 1:44 PM MDTSevere Thunderstorm WatchSPCCarter, Custer, Fallon, Powder River6 hr
Jun 3, 6:04 PM MDTMesoscale DiscussionSPCAdams, Blaine, Boone, Buffalo, Butler, Cass and 34 more56 min
Jun 3, 8:41 PM MDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Butler, Cass, Clay and 34 more64 min
Jun 3, 11:28 PM MDTMesoscale DiscussionSPCGage, Jefferson, Johnson, Nemaha, Otoe, Pawnee and 2 more62 min
Jun 3, 11:50 PM MDTSevere Thunderstorm WatchSPCGage, Jefferson, Johnson, Lancaster, Nemaha, Otoe and 3 more3 hr
Jun 4, 4:41 PM MDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 15 more64 min
Jun 4, 5:12 PM MDTSevere Thunderstorm WatchSPCArthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 14 more8 hr
Jun 4, 5:40 PM MDTMesoscale DiscussionSPCBenson, Bottineau, Burleigh, Eddy, Foster, McHenry and 11 more95 min

Nearby

Mesoscale Discussions in South Dakota, 2014Mesoscale Discussions in Montana, 2014Mesoscale Discussions in Wyoming, 2014Every mesoscale discussion in 2014

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.