Alert archive / South Dakota / Mesoscale Discussions in 2019

Mesoscale Discussion 191

March 13, 2019Dawes County, Nebraska; 13 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2019, 3:59 AM MDT for Dawes County, Nebraska; 13 counties in South Dakota. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Mar 13, 2019, 3:59 AM MDT (09:59 UTC)
Expired: Mar 13, 2019, 8:00 AM MDT
In force: 4 hr
Issued by: the Storm Prediction Center

Counties Dawes County, NE, Bennett County, SD, Buffalo County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Oglala Lakota County, SD, Stanley County, SD

The radar

The Rapid City radar (KUDX), 123 km from the middle of the area, began a volume at 09:57 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 00:00Z, 10.0 hours before the alert went out and 268 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: 1294 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 68 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
Mar 13, 6:20 AM MDT	Mesoscale Discussion	SPC	Dawes, Sioux	4 hr
Mar 13, 10:27 AM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	3 hr
Mar 13, 1:37 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more	4 hr
Mar 13, 2:35 PM MDT	Mesoscale Discussion	SPC	Adams, Clay, Fillmore, Gage, Hall, Hamilton and 11 more	85 min
Mar 13, 5:26 PM MDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 10 more	6 hr

Nearby

Mesoscale Discussions in South Dakota, 2019 Mesoscale Discussions in Nebraska, 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.