A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >
Overview
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On May 17th, 2018 storms initially formed along a boundary across parts of north central South Dakota. The slow moving storms trained along this boundary and produced significant flooding, large hail and gusty winds. Anywhere from 4 to 9 inches of rain has been estimated along a line extending from Selby, SD to Long Lake, SD. Many roads were over topped with water and barricades were setup. Several reports of basement flooding were noted. Additional wind producing storms developed over western South Dakota and moved along the I-90/Pierre area. Wind gusts ranging from 60 to 80 mph were reported. Damage included a semi truck tipped over, sheet metal blown off roofs and significant tree damage. The heavy rain also aided in the failure of the Hiddenwood Dam at Hiddenwood State Park about 4 miles northeast of Selby, SD during the early morning hours of May 18th, 2018. Water from that break resulted in significant overland flooding and many county and secondary roads went under water. |
 Flooding in Long Lake, SD. Photo courtesy of Sandy Chapman. |
Photos & Video:
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| Golfball Size Hail in Eureka, SD Courtesy of Keith Kramlich |
Floding in Eureka, SD Courtesy of Keith Kramlich |
Flooding in Long Lake, SD Courtesy of Sandy Chapman |
Hail in Long Lake, SD Courtesy of Sandy Chapman |
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| Wind Damage North of Eureka, SD Courtesy of Eric Odenbach |
Wind Damage North of Eureka, SD Courtesy of Eric Odenbach |
Flooding 15 Miles NE of Java, SD Courtesy of Ashley Schaefer |
Wind Damage near Onida, SD Courtesy of KCCR Pierre |
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| Wind Damage in Pierre, SD Courtesy of Leahandra Maria Ashley |
Wind Damage near Onida, SD Courtesy of KCCR Pierre |
Hiddenwood Dam Break Courtesy of Walworth County Sheriff |
Hiddenwood Dam Break Courtesy of Walworth County Sheriff |
Storm Reports
Radar estimated rainfall totals from https://water.weather.gov/precip/. Some of the more extreme measured totals range from 9 to 13+ inches of rain within 24 hours near the Long Lake, SD area.
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