BISMARCK, N.D. (AP) _ The National Weather Service says its Doppler radar in Bismarck has been shut down for an upgrade.
The installation of dual-polarization Doppler is part of a $50 million upgrade to radar systems nationwide.
The major advantage is the ability to distinguish the shape and size of objects in the air. Forecasters say it can help them predict flash floods and determine the difference between rain and snow when it is near 32 degrees.
Officials say the radar will be down no longer than two weeks.