National Weather Service United States Department of Commerce

Areas of Severe Thunderstorms and Excessive Rainfall through This Weekend

A multi-day thunderstorm and heavy rain event will impact the south-central U.S. this Memorial Day weekend. Severe thunderstorms may produce large hail, severe gusts, and a possible tornado or two across portions of the central and southern Plains through Monday. The threat for heavy to excessive rainfall and possible flash flooding will return to the south-central U.S., especially in the Ozarks. Read More >

Weather History - April 20th

Local and Regional Events:

April 20th, 1966:

Canadian high pressure brought frigid air to the Rockies and northern Plains. Record lows included three below in Scottsbluff, Nebraska, two below in Cheyenne and Casper, Wyoming, two above in Rapid City, 11 above in Fargo, Williston, and Aberdeen, and 15 in Huron.

April 20th, 2007:

Severe thunderstorms moved through parts of central and northeast South Dakota during the afternoon and evening, producing large hail. The most significant hail measured 1.75 inches in diameter and fell 3 miles east of Westport in Brown County.