Alert archive / South Dakota / Winter Storm Watches in 2021

Winter Storm Watch 1, NWS Aberdeen, SD

January 13, 20218 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this winter storm watch at Jan 13, 2021, 2:43 PM CST for 8 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Jan 14, 2021, 12:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 13, 2021, 2:43 PM CST (20:43 UTC)
In effect from: Jan 14, 2021, 12:00 PM CST
Expired: Jan 14, 2021, 2:50 AM CST
In force
Issued by: NWS Aberdeen, SD

Counties Big Stone County, MN, Traverse County, MN, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 109 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 112 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: 2309 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 194 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 storm watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this winter storm watch went out at Jan 13, 11:55 AM CST, 2 hours 48 minutes earlier.

Area forecast discussion, Jan 13, 11:55 AM CST, 2 hours 48 minutes before

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Hazardous weather outlook, Jan 13, 4:24 AM CST, 10 hours 19 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 13, 1:40 PM CST	Red Flag Warning	ABR	Corson, Dewey, Jones, Lyman, Stanley	27 hr
Jan 13, 2:37 PM CST	High Wind Warning	ABR	Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 12 more	45 hr

Nearby

Winter Storm Watches in South Dakota, 2021 Winter Storm Watches in Minnesota, 2021 Every winter storm watch 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.