I recall, not so many years ago when radar sites were dismantled across the northern CONUS. Along with them, as a 'cost saving' measure doppler sites were closed down as well. (There is still a large, if sparsely populated, portion of Montana, Wyoming, South, and North Dakota that has no coverage.Next time there is a major storm set through the region, I'll grab a screenshot showing the limits. I haven't posted it, ever, though I have observed it multiple times, because it might represent a corridor of vulnerability.