Alert archive / South Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Rapid City, SD

September 2, 2021Mellette County, Todd County, South Dakota

NWS Rapid City, SD issued this special weather statement at Sep 2, 2021, 12:22 AM CDT for Mellette County, Todd County, South Dakota. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 2, 2021, 12:22 AM CDT (05:22 UTC)
Expired: Sep 2, 2021, 1:00 AM CDT
In force: 38 min
Issued by: NWS Rapid City, SD
Hail: 0.00 in
Wind: 40

Counties Mellette County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 189 km from the middle of the area, began a volume at 05:25 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, 5.4 hours before the alert went out and 205 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: 12 J/kg
Mixed-layer CIN: -408 J/kg
Mixed-layer LCL: 1249 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 1, 9:36 PM CDT	Special Weather Statement	UNR	Bennett	39 min
Sep 1, 10:04 PM CDT	Special Weather Statement	UNR	Oglala Lakota	26 min
Sep 1, 10:24 PM CDT	Special Weather Statement	UNR	Bennett	51 min
Sep 1, 10:26 PM CDT	Special Weather Statement	UNR	Jackson	34 min
Sep 1, 10:54 PM CDT	Special Weather Statement	UNR	Bennett	36 min
Sep 1, 11:16 PM CDT	Special Weather Statement	UNR	Mellette	44 min
Sep 1, 11:24 PM CDT	Special Weather Statement	UNR	Bennett	51 min
Sep 2, 12:48 AM CDT	Areal Flood Advisory	UNR	Mellette, Todd, Tripp	6 hr
Sep 2, 4:00 AM CDT	Flash Flood Warning	UNR	Mellette, Todd, Tripp	3 hr

Nearby

Special Weather Statements in South Dakota, 2021 Every special weather statement in 2021

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.