BILLINGS, Mont. -

A hefty mountain snowpack in the Northern Rockies has driven down the summer wildfire potential and bumped up prospects that farmers in most of Montana and Wyoming won't go dry.
    
As for flooding, government forecasters say the coming weeks will make all the difference.
    
A relatively even warm-up would keep swollen streams and rivers in check. Too much warm weather and flooding could again threaten downstream communities.
    
Deep snows across the region three years ago led to flooding in the Missouri River basin that swamped hundreds of thousands of acres across the Upper Midwest.
    
Department of Agriculture hydrologist Lucas Zukiewicz in Bozeman says 2011 stood out as an anomaly caused by late snowfalls and heavy rains.
    
He forecasts above-average stream flows across most of the region through July 31.