A quick moving upper level wave amplified while sliding eastward across the Central Plains.  Snowfall developed quickly ahead of this feature, with broad snowfall in and near northwest Iowa collapsing into a narrow band due to the presence of mid-level instability above a lower-level frontogenetic zone.

Winter Storm in WOODBURY, IOWA
From 21-FEB-21 05:00:00 to 21-FEB-21 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall reduced visibility to one-quarter to one-half mile at times between 0700-1200CST and produced treacherous travel conditions. Accumulation reached 8.0 inches 4 miles north northeast of Hornick, 6.5 inches 1 mile east of Bronson and 6.0 inches at Sergeant Bluff.

Winter Storm in IDA, IOWA
From 21-FEB-21 05:00:00 to 21-FEB-21 16:00:00 (CST-6)
Reported by: COOP Observer

Snowfall reduced visibility to one-quarter to one-half mile at times between 0700-1300CST and produced treacherous travel conditions. Accumulation reached 10.0 inches 4 miles south southwest of Arthur, 9.5 inches 3 miles northeast of Battle Creek, 8.0 inches at Ida Grove and 6.5 inches 5 miles north northwest of Holstein.

Winter Storm in PLYMOUTH, IOWA
From 21-FEB-21 06:00:00 to 21-FEB-21 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall reduced visibility to one-quarter to one-half mile at times between 0700-1200CST and produced treacherous travel conditions. Accumulation reached 6.0 inches at Kingsley and 2.7 inches at Le Mars.

Winter Weather in CHEROKEE, IOWA
From 21-FEB-21 06:00:00 to 21-FEB-21 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to around one-half mile at times between 0800-1300CST and produced dangerous travel conditions. Accumulation reached 5.0 inches at Cherokee and 4 miles north of Cleghorn.

Winter Weather in BUENA VISTA, IOWA
From 21-FEB-21 06:00:00 to 21-FEB-21 16:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to one-quarter to one-half mile at times between 0700-1400CST and produced dangerous travel conditions. Accumulation reached 4.5 inches at Sioux Rapids and 4.0 inches at Storm Lake.

Winter Weather in CLAY, IOWA
From 21-FEB-21 07:00:00 to 21-FEB-21 16:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to one-quarter to one-half mile at times between 0800-1400CST and produced dangerous travel conditions. Accumulation reached 4.9 inches at Spencer and 4.0 inches 3 miles west northwest of Everly.

Winter Weather in O'BRIEN, IOWA
From 21-FEB-21 07:00:00 to 21-FEB-21 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to one-quarter to one-half mile at times between 0700-1200CST and produced dangerous travel conditions. Accumulation reached 5.4 inches at Sanborn, 4.0 inches at Primghar and 3.5 inches at Sheldon.

Winter Weather in SIOUX, IOWA
From 21-FEB-21 07:00:00 to 21-FEB-21 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to one-quarter to one-half mile at times between 0700-1200CST and produced dangerous travel conditions. Accumulation reached 3.2 inches at Orange City and 3.0 inches at Sioux Center.

Winter Weather in OSCEOLA, IOWA
From 21-FEB-21 08:00:00 to 21-FEB-21 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall briefly reduced visibility to one-quarter to one-half mile at times between 0800-1300CST and produced dangerous travel conditions. Accumulation reached 4.0 inches at Sibley.

Winter Weather in DICKINSON, IOWA
From 21-FEB-21 08:00:00 to 21-FEB-21 16:00:00 (CST-6)
Reported by: COOP Observer

Snowfall occasionally reduced visibility to around one-half mile between 0800-1300CST and produced dangerous travel conditions. Accumulation reached 4.3 inches at Spirit Lake and 3.0 inches at Lake Park.