Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 933

June 28, 201813 counties in Montana; 39 counties in North Dakota; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2018, 8:06 PM MDT for 13 counties in Montana; 39 counties in North Dakota; 5 counties in South Dakota. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jun 28, 2018, 8:06 PM MDT (02:06 UTC)
Expired
Jun 28, 2018, 9:30 PM MDT
In force
84 min
Issued by
the Storm Prediction Center
All 57 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, McCone County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Treasure County, MT, Wibaux County, MT, Adams County, ND, Barnes County, ND, Benson County, ND, Billings County, ND, Bowman County, ND, Burleigh County, ND, Dickey County, ND, Dunn County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Golden Valley County, ND, Grant County, ND, Griggs County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Nelson County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Stutsman County, ND, Towner County, ND, Ward County, ND, Wells County, ND, Williams County, ND, Campbell County, SD, Corson County, SD, Harding County, SD, McPherson County, SD, Perkins County, SD

The radar

The Bismarck radar (KBIS), 199 km from the middle of the area, began a volume at 02:08 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.1 hours before the alert went out and 204 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, Bismarck Municip, ND at 00:00Z on 2018-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2612 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, Bismarck Municip, ND at 00:00Z on 2018-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 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
2612 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1800 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.4
Supercell composite
11.7

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 29, 11:23 AM MDTMesoscale DiscussionSPCBig Horn, Carbon97 min
Jun 29, 1:06 PM MDTSevere Thunderstorm WatchSPCCarter, Powder River9 hr
Jun 29, 2:29 PM MDTMesoscale DiscussionSPCCarter, Powder River91 min
Jun 28, 9:21 PM MDTMesoscale DiscussionSPCAdams, Barnes, Benson, Billings, Bottineau, Burke and 43 more84 min
Jun 28, 9:54 PM MDTSevere Thunderstorm WatchSPCAdams, Barnes, Benson, Billings, Bottineau, Bowman and 43 more9 hr
Jun 29, 1:02 AM MDTMesoscale DiscussionSPCAdams, Barnes, Benson, Bowman, Burleigh, Cass and 35 more118 min
Jun 29, 3:14 AM MDTMesoscale DiscussionSPCCass, Cavalier, Grand Forks, Pembina, Ramsey, Ransom and 4 more2 hr
Jun 29, 4:57 PM MDTMesoscale DiscussionSPCEmmons, Sioux63 min
Jun 29, 5:19 PM MDTSevere Thunderstorm WatchSPCBennett, Buffalo, Campbell, Corson, Dewey, Edmunds and 18 more8 hr

Nearby

Mesoscale Discussions in North Dakota, 2018Mesoscale Discussions in Montana, 2018Mesoscale Discussions in South Dakota, 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.