They've been doing that in Boston (with normal, not LED lights) for decades. Old Hancock tower has coded weather info:
Steady blue, clear view.
Flashing blue, clouds due.
Steady read, rain ahead.
Flashing red, snow instead. (or in summer, Red Sox game is cancelled)
As for the other ideas, the lights on the Prudential tower in boston have been changed to be a sound meter during the 4th of July concert, and the lights on the Green Building at MIT were hacked to play tetris:
[citation][nom]michaelzehr[/nom][/citation]
The Canada Life building in Toronto gives us the weather, though it's not too tall so you have to be in the area, and I never remenber what the colours mean. The CN Tower does things with its lights such as going green on St. Patrick's day. Actually I think it goes blue every game for the Toronto Maple Leafs hockey team.
in what way is a building with LED's a forecasting tool?
it might just be a method of telling people what the forecast is, but the title forecasting tool insinuates that it in some way helps you to come up with a forecast
[citation][nom]johnny_5[/nom]Actually I think it goes blue every game for the Toronto Maple Leafs hockey team.[/citation]
I am over in Edmonton... I get blue when i see the Leafs are on TV! and also the Oilers