Alert archive / South Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 1113

July 5, 2020Adams County, North Dakota; 4 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2020, 6:24 PM MDT for Adams County, North Dakota; 4 counties in South Dakota; 4 counties in Wyoming. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jul 5, 2020, 6:24 PM MDT (00:24 UTC)
Expired: Jul 5, 2020, 7:30 PM MDT
In force: 66 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 332

Counties Adams County, ND, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 90 km from the middle of the area, began a volume at 00:28 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.4 hours before the alert went out and 349 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 132 J/kg
Mixed-layer CIN: -212 J/kg
Mixed-layer LCL: 1727 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.4

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.

Issued	Product	Office	Counties	Lasted
Jul 5, 7:33 PM MDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, LaMoure, McIntosh, Ransom and 2 more	117 min
Jul 6, 1:50 PM MDT	Mesoscale Discussion	SPC	Adams, Bowman, Golden Valley, Slope	115 min
Jul 6, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Bowman, Slope	7 hr
Jul 6, 5:14 PM MDT	Mesoscale Discussion	SPC	Bowman	91 min
Jul 5, 10:15 PM MDT	Mesoscale Discussion	SPC	Jones, Mellette, Perkins, Stanley, Todd, Ziebach	60 min
Jul 6, 12:57 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Clay, Davison, Douglas, Hanson, Hutchinson and 8 more	2 hr
Jul 6, 4:01 PM MDT	Mesoscale Discussion	SPC	Clay	89 min

Nearby

Mesoscale Discussions in South Dakota, 2020 Mesoscale Discussions in Wyoming, 2020 Mesoscale Discussions in North Dakota, 2020 Every mesoscale discussion in 2020

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.