NOAA predicts that Montana can expect a cool, wet winter that could lead to heavy runoff next spring.

The forecast was made by the Corps’ Missouri River Water Management Division. Despite cold, snowy weather in October, precipitation was well below normal in much of the upper basin. The 2020 calendar year runoff forecast is 30.2 million acre-feet, 117% of average. This winter is setting up for a La Nina pattern, which typically means colder weather across Montana, Wyoming and the Dakotas. Looking through January, the outlook is also for above normal precipitation in those states. February through April forecast is trending toward below-normal temperatures and above-average precipitation.


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