Overview
A compact strong upper wave moved east from northeast Nebraska into northern Iowa the night of April 17-18, bringing rain, sleet and snow across the area. As the system approached the region, rain and a mix of precipitation started to fall along the Missouri River into northwest Iowa shortly after midnight. Rain quickly changed to moderate snow (heavy at times) along and west of the I-29 corridor, while northwest Iowa were reporting thunder sleet and thunder snow early in the morning hours. Precipitation quickly changed to widespread snow after 4 am Wednesday, with snowfall rates of 1 to 2 inches per hour. Snowfall amounts range from 2 to 10 inches. Highest snow accumulations occurred from the Interstate 90 corridor and southward. |
Snow/Ice
...48 Hour Snowfall Reports From April 18th... Location Amount Time/Date Provider 10 W Dimock 10.2 in 0800 AM 04/18 COCORAHS Wall Lake 10.0 in 0800 AM 04/19 COCORAHS Tyndall 9.0 in 0800 AM 04/19 COOP Bridgewater 7.5 in 0800 AM 04/19 COOP 4 N Cleghorn 7.0 in 0700 AM 04/19 COCORAHS Cherokee 7.0 in 0800 AM 04/19 COOP Sioux Falls Airport 6.2 in 0656 AM 04/19 ASOS 2 NE Crooks 6.2 in 0700 AM 04/19 COCORAHS 3 WNW Everly 6.0 in 0700 AM 04/19 COOP Lakefield 5.6 in 0700 AM 04/19 COOP Sheldon 5.5 in 0700 AM 04/19 COOP Remsen No. 2 5.4 in 0625 AM 04/19 COOP 2 NE Academy 5.0 in 0900 AM 04/19 COOP Orange City 4.8 in 0700 AM 04/19 COOP Salem 5NE 4.7 in 0700 AM 04/19 COOP White Lake 4.3 in 0700 AM 04/19 COOP Worthington 4.2 in 0700 AM 04/19 COOP 4 SW Burke 4.0 in 0700 AM 04/19 COCORAHS Sioux City ANG 3.6 in 0600 AM 04/19 COOP 6 S Oacoma 3.5 in 0630 AM 04/19 COCORAHS 7 WNW Naper 3.0 in 0700 AM 04/19 COCORAHS Chester 2N 3.0 in 0700 AM 04/19 COOP Burke 2.4 NE 3.0 in 0700 AM 04/19 COCORAHS 8 S Dallas 3.0 in 0700 AM 04/19 COCORAHS Woonsocket 2.9 in 0800 AM 04/19 UCOOP Sioux Gateway Airport 2.5 in 0652 AM 04/19 ASOS Chamberlain 2.4 in 0530 AM 04/19 COCORAHS Howard 2.4 in 0630 AM 04/19 COOP Huron Regional Airport 2.0 in 0655 AM 04/19 ASOS 2 E Madison 1.5 in 0900 AM 04/19 COOP Holly Springs 1NW 1.0 in 0700 AM 04/19 COOP Observations are collected from a variety of sources with varying equipment and exposures. We thank all volunteer weather observers for their dedication. Not all data listed are considered official.
Record Snowfall
Photos & Video:
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Visible Satellite Imagery from GOES16 showing the system before it moved through the area. | Car Accident during the morning commute at I-90 near Montrose, SD (Courtesy of South Dakota Department of Transporation) |
Radar:
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Radar Loop April 18, 2018 (1 am - 7 am) Areas of rain, snow and sleet quickly moving east-northeast into the region |
Radar Loop April 18, 2018 (7 am - 1 pm) Widespread snow, heavy at times, continues in the morning, impacting the morning commute. |
Radar Loop April 18, 2018 (1 pm - 7 pm) Snow gradually tapering off as the system moves out of the region. |
Radar Reflectivity and Lighting (White Dots) Radar loop from 1 am to 7 am Wednesday Lightning Data Provided by the National Lightning Detection Network (NLDN) |
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