A deep trough again progressed through the Rockies and evolved to a compact closed mid-level circulation drifting across eastern Nebraska and Iowa on April 18. Weak instability resulted in some scattered thunder with sleet and snow from the lower Missouri River valley through northwest Iowa. Marginally warmer temperatures aloft allowed for some light mixed precipitation early on April 18, but a quick transition to snow occurred in the pre-dawn hours, leaving behind between 5 and 11 inches snowfall across the region.

Winter Storm in DOUGLAS, SOUTH DAKOTA
From 18-APR-18 01:30:00 to 18-APR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-0900CST. Snowfall totaled 8.4 inches 10 miles west of Dimock.

Winter Storm in BON HOMME, SOUTH DAKOTA
From 18-APR-18 01:30:00 to 18-APR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0200-0900CST. Snowfall totaled 9.0 inches at Tyndall and 7.5 inches 8 miles west northwest of Springfield.

Winter Storm in CHARLES MIX, SOUTH DAKOTA
From 18-APR-18 01:30:00 to 18-APR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0100CST. Visibility dropped to a half mile or less at times between 0200-0900CST. Snowfall totaled 9.0 inches near Wagner and 5.0 inches 2 miles northeast of Academy.

Winter Storm in GREGORY, SOUTH DAKOTA
From 18-APR-18 01:30:00 to 18-APR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0100CST. Visibility dropped to a half mile or less at times between 0200-0900CST. Snowfall totaled 7.1 inches 4 miles south southwest of Pickstown and 5.0 inches 9 miles north of Gregory.

Winter Storm in HUTCHINSON, SOUTH DAKOTA
From 18-APR-18 02:00:00 to 18-APR-18 12:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-0900CST. Snowfall totaled 11.0 inches at Parkston and 8.0 inches at Menno.

Winter Storm in TURNER, SOUTH DAKOTA
From 18-APR-18 02:00:00 to 18-APR-18 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-1000CST. Snowfall totaled 8.0 inches at Hurley and 5.7 inches at Marion.

Winter Storm in MINNEHAHA, SOUTH DAKOTA
From 18-APR-18 02:30:00 to 18-APR-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

After a brief period of mixed precipitation, snow became dominant after 0300CST. Visibility dropped to a half mile or less at times between 0300-0900CST. Snowfall totaled 10.0 inches at Wall Lake and 6.2 inches at the NWS office at Joe Foss Field.

Winter Storm in MCCOOK, SOUTH DAKOTA
From 18-APR-18 02:30:00 to 18-APR-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0300CST. Visibility dropped to a half mile or less at times between 0300-0900CST. Interstate 90 was closed between 0930CST and 1130CST when a semi-truck jackknifed across the roadway. Snowfall totaled 8.0 inches at Montrose and 7.5 inches at Bridgewater.

Winter Storm in UNION, SOUTH DAKOTA
From 18-APR-18 03:00:00 to 18-APR-18 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-0900CST. A semi-truck accident closed Interstate 29 between 0700CST and 1115CST. Snowfall totaled 8.0 inches at Canton and 4.2 inches 6 miles north northeast of Elk Point.

Winter Storm in LINCOLN, SOUTH DAKOTA
From 18-APR-18 02:30:00 to 18-APR-18 13:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0300CST. Visibility dropped to a half mile or less at times between 0300-1000CST. Snowfall totaled 8.0 inches at Canton.

Winter Storm in CLAY, SOUTH DAKOTA
From 18-APR-18 02:00:00 to 18-APR-18 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-1000CST. Snowfall totaled 8.0 inches 6 miles southeast of Centerville and 6.5 inches near Vermillion.

Winter Storm in YANKTON, SOUTH DAKOTA
From 18-APR-18 01:00:00 to 18-APR-18 12:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

After a brief period of mixed precipitation, snow became dominant after 0200CST. Visibility dropped to a half mile or less at times between 0300-0900CST. Snowfall totaled 6.0 inches at Yankton.