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原文传递 Western Drought Reflected In Reduced Missouri River Runoff

题名：	Western Drought Reflected In Reduced Missouri River Runoff
正文语种：	eng
作者：	DAVID MURRAY
摘要：	The Corps of Engineers reported June 3 that below-average precipitation and dry soil conditions continue to persist in the upper Missouri River Basin above Sioux City, Iowa, and said the lower runoffs would continue through the summer and into the fall. The entire western half of the United States has been affected by dry conditions. The March 18 Spring Outlook of the National Oceanic and Aeronautic Administration, which runs through June 30, had forecast drier conditions in the southwest U.S. NOAA said the dry conditions, associated with a La Nina weather oscillation and the failed 2020 summer monsoon, have contributed to "the most significant U.S. spring drought since 2013, which will impact approximately 74 million people." The updated 2021 upper basin runoff forecast is 17.9 million acre-feet (maf.), or 69 percent of average. If realized, this runoff amount would be the 22nd driest year in the upper basin since 1898. The May upper basin runoff was 64 percent of average. May runoff in the Fort Peck and Garrison reaches, where much of the upper basin runoff from mountain snow-melt originates, was 60 percent and 68 percent of average, respectively.
出版年：	2021
期刊名称：	The Waterways Jouranl
卷：	135
期：	10