Alert archive / South Dakota / Mesoscale Discussions in 2022

Mesoscale Discussion 694

May 9, 2022Cherry County, Keya Paha County, Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 9, 2022, 12:32 AM MDT for Cherry County, Keya Paha County, Nebraska; 6 counties in South Dakota. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: May 9, 2022, 12:32 AM MDT (06:32 UTC)
Expired: May 9, 2022, 2:30 AM MDT
In force: 118 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 191

Counties Cherry County, NE, Keya Paha County, NE, Bennett County, SD, Gregory County, SD, Lyman County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 134 km from the middle of the area, began a volume at 06:33 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

Rapid City, SD (KUNR), launched 00:00Z, 6.5 hours before the alert went out and 217 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: 2138 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 22 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
May 8, 9:45 PM MDT	Mesoscale Discussion	SPC	Cherry, Keya Paha	90 min
May 8, 10:48 PM MDT	Severe Thunderstorm Watch	SPC	Boyd, Brown, Cherry, Keya Paha, Rock, Sheridan	6 hr
May 9, 2:46 AM MDT	Mesoscale Discussion	SPC	Boyd	89 min
May 9, 4:12 AM MDT	Mesoscale Discussion	SPC	Beadle, Brookings, Clark, Codington, Davison, Day and 13 more	63 min

Nearby

Mesoscale Discussions in South Dakota, 2022 Mesoscale Discussions in Nebraska, 2022 Every mesoscale discussion in 2022

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.