The browns are high wind (≥ 50 mph) watches and warnings for a major windstorm starting tonight and continuing Thursday night. In some areas, gusts will exceed 80 mph. There will be scattered power outages and it will be dangerous for tractor-trailers and other high profile vehicles.
Greens are various flood statements and warnings. Purple is a winter weather advisory and the greenish blue in the Upper Midwest is a winter storm watch. Bright blue is an avalanche warning.