I wish them luck, but I don't think selling ads on a weather site will be easy, especially without a massive amount of traffic. What types of ads will be relevant? Those for umbrellas? Maybe products for storm chasers or meteorologists? These types of businesses are probably not in the habit of buying internet ads, and if they give it a shot, it likely won't convert.

Looking at other weather websites, the ads are generic and untargeted. Basically massive brand campaigns for prescription drugs, insurance, etc. Weather is likely a poor monetizing niche and these advertisers buy massive amounts of remnant inventory.