Still, logistically, it's tough to implement. To do so makes them kind of become weather forecasters, earthquake scientists, etc. In this case, they'd need to monitor the news services, determine the severity of shutdown to customers, etc. Then decide whether or not to delay or not. Not very easy, and would produce unhappiness no matter what decision. Probably most efficient to just rely on "no delays" as a hard policy. That way, all know this, and there's never any "I wonder if WIS will delay" question for customers.