If this is the case, they should ditch the banner ads. On my laptop, with a vertically maximized browser window I can see three ads (EyeQ, LifeLock, and a google text ad that promises to let me know a shocking secret about coffee), but I can't see the legend.
That seems like the model for a site that is trying to make money by having a large volume of visitors clicking ads, not the model for a site that wants serious, important people who have some reason to care about weather.