Weather: Local Doppler will aid forecasts
Doppler radar is an amazing thing. It can detect intense moisture up to 150 miles from the radar site. However, the range is closer to 90 miles to detect less intense rain and snow. Since Doppler radar is line-of-sight, the curvature of the earth leads to the radar beam "overshooting" cloud tops beyond this distance. The Doppler radar sites nearest Bemidji are located outside of Mayville, N.D., and at the Duluth International Airport, 115 and 135 miles distant, respectively.
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