Alert archive / South Dakota / Mesoscale Discussions in 2019

Mesoscale Discussion 1749

August 15, 20195 counties in Minnesota; 17 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2019, 5:42 PM CDT for 5 counties in Minnesota; 17 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 15, 2019, 5:42 PM CDT (22:42 UTC)
Expired: Aug 15, 2019, 7:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 22 counties

Big Stone County, MN, Lac qui Parle County, MN, Lincoln County, MN, Pipestone County, MN, Traverse County, MN, Brookings County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Hanson County, SD, Kingsbury County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 116 km from the middle of the area, began a volume at 22:45 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

Aberdeen, SD (KABR), launched 12:00Z, 10.7 hours before the alert went out and 109 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1279 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 113 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.

Issued	Product	Office	Counties	Lasted
Aug 15, 1:18 PM CDT	Mesoscale Discussion	SPC	Big Stone, Lincoln, Pipestone	87 min
Aug 15, 3:09 PM CDT	Severe Thunderstorm Watch	SPC	Big Stone, Traverse	6 hr
Aug 14, 9:14 PM CDT	Mesoscale Discussion	SPC	Butte, Custer, Lawrence, Pennington	91 min
Aug 14, 11:56 PM CDT	Mesoscale Discussion	SPC	Custer, Fall River, Oglala Lakota, Pennington	94 min
Aug 15, 2:29 AM CDT	Mesoscale Discussion	SPC	Fall River	2 hr

Nearby

Mesoscale Discussions in South Dakota, 2019 Mesoscale Discussions in Minnesota, 2019 Every mesoscale discussion in 2019

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.