Alert archive / South Dakota / Winter Storm Warnings in 2019

Winter Storm Warning 12, NWS Aberdeen, SD

December 29, 201914 counties in South Dakota

NWS Aberdeen, SD issued this winter storm warning at Dec 29, 2019, 11:55 AM CST for 14 counties in South Dakota. It took effect at Dec 30, 2019, 12:00 AM CST. It was in force for 6 hr. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Dec 29, 2019, 11:55 AM CST (17:55 UTC)
In effect from: Dec 30, 2019, 12:00 AM CST
Expired: Dec 30, 2019, 6:00 AM CST
In force: 6 hr
Issued by: NWS Aberdeen, SD

Counties Brown County, SD, Campbell County, SD, Clark County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hyde County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 53 km from the middle of the area, began a volume at 17:59 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.

What was reported inside it

Time	Report	Where	Remark
Dec 30, 12:18 AM CST	SNOW 9.6	3 Ese Aberdeen, SD	STORM TOTAL SNOW AS OF 12AM DEC 30. LIGHT SNOW ONGOING.
Dec 30, 5:30 AM CST	SNOW 8.3	8 S Vayland, SD	STORM TOTAL SNOW SO FAR. STILL SNOWING.
Dec 30, 6:00 AM CST	SNOW 9.8	3 Ese Aberdeen, SD	STORM TOTAL SNOWFALL SO FAR. STILL SNOWING.
Dec 30, 6:00 AM CST	SNOW 12.2	Clark, SD	CO-OP OBSERVER STATION CAKS2 CLARK. 8.1 INCHES IN THE LAST 24 HOURS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 5.9 hours before the alert went out and 57 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: 526 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 139 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 warning 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 warning went out at Dec 28, 5:42 PM CST, 18 hours 13 minutes earlier.

Area forecast discussion, Dec 28, 5:42 PM CST, 18 hours 13 minutes before

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Hazardous weather outlook, Dec 28, 2:30 PM CST, 21 hours 25 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
Dec 29, 11:55 AM CST	Blizzard Warning	ABR	Brown, Campbell, Clark, Day, Edmunds, Faulk and 8 more	12 hr

Nearby

Winter Storm Warnings in South Dakota, 2019 Every winter storm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.