An intense negative tilt upper-level trough pushed out across the Rockies and into the Plains on March 5, deepening into a very strong closed low across Iowa by early on March 6. 500 hPa heights fell as much as 27 dam in 24 hours as the system deepened. As a result, winds increased to a gusty 40 to 50 mph and produced brief periods of near blizzard conditions. The system was dynamic enough to produce a few thunderstorms early on March 5.

Winter Weather in CLAY, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in SIOUX, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in PLYMOUTH, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in LYON, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in CHEROKEE, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in BUENA VISTA, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in WOODBURY, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in DICKINSON, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in OSCEOLA, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in O'BRIEN, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.

Winter Weather in IDA, IOWA
From 05-MAR-18 10:00:00 to 06-MAR-18 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved toward midday on March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 45 mph at Sioux City, 40 mph at Le Mars, 39 mph at Cherokee and Spencer, and 37 mph at Sheldon. There were brief blizzard or near blizzard conditions during the evening and overnight in portions of Lyon, Sioux, O'Brien, Plymouth and Woodbury counties, but not persistent enough to be defined as a blizzard.  Total snowfall was generally 3 to 6 inches across northwest Iowa, including 5.7 inches at Sheldon, 4.0 inches at Holstein,  Cherokee and Lake Park, and 3.7 inches at Akron, Remsen and Sioux City.