Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

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 >

The National Weather Service completed a service assessment for flooding along the Missouri and Souris Rivers that occurred from May through August 2011. The final report of this assessment may be read at:

http://www.weather.gov/media/publications/assessments/Missouri_floods11.pdf

Service assessments are internal reviews of the National Weather Service’s performance during certain Hydrometeorological, oceanographic, and geological events. They identify best practices and areas for product and service improvements in the form of findings and recommendations.

Additional information regarding this and other floods across South Dakota from 1881 to 2019 can be found here, courtesy of the U.S. Corps of Engineers (alternatively here, via the South Dakota State Historical Society).

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Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

NWS Completes Internal Assessment for 2011 Missouri River Flooding