Alert archive / South Dakota / Winter Weather Advisories in 2021

Winter Weather Advisory 14, NWS Sioux Falls, SD

December 14, 202120 counties in South Dakota; Dickinson County, Lyon County, Osceola County, Iowa; 8 counties in Minnesota

NWS Sioux Falls, SD issued this winter weather advisory at Dec 14, 2021, 2:28 PM CST for 20 counties in South Dakota; Dickinson County, Lyon County, Osceola County, Iowa; 8 counties in Minnesota. It took effect at Dec 15, 2021, 4:00 PM CST. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Dec 14, 2021, 2:28 PM CST (20:28 UTC)
In effect from: Dec 15, 2021, 4:00 PM CST
Expired: Dec 16, 2021, 2:48 AM CST
In force: 11 hr
Issued by: NWS Sioux Falls, SD

All 31 counties

Dickinson County, IA, Lyon County, IA, Osceola County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 36 km from the middle of the area, began a volume at 20:29 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 302 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: 1412 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this winter weather advisory went out at Dec 14, 11:17 AM CST, 3 hours 11 minutes earlier.

Area forecast discussion, Dec 14, 11:17 AM CST, 3 hours 11 minutes before

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Hazardous weather outlook, Dec 14, 4:44 AM CST, 9 hours 44 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 14, 4:04 AM CST	High Wind Watch	FSD	Aurora, Beadle, Brookings, Brule, Davison, Hanson and 8 more	11 hr
Dec 14, 4:04 AM CST	High Wind Warning	FSD	Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 18 more	47 hr
Dec 14, 2:35 PM CST	Wind Advisory	FSD	Beadle, Brookings, Jerauld, Kingsbury, Miner, Sanborn	12 hr

Nearby

Winter Weather Advisories in South Dakota, 2021 Winter Weather Advisories in Minnesota, 2021 Winter Weather Advisories in Iowa, 2021 Every winter weather advisory 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.