you also want to leave the valve open through the wiptnter seaso. >> people are worried about their pipes freezing. how quickly could that happen? >> it could happen in 30 minutes. >> wow. >> yes. especially for a toilet. >> remember to change your filte filters. it could also cost you money because your system has to work harder to keep you warm. >>> good wednesday to you. here with your updated forecast is camel back mountain. this will be one of the worst spots to be in terms of the windchill later on tonight and tomorrow. even for skiers it is a dangerous round of cold. very important to keep yourself dry. if you take a spill get yourself inside to change your clothes, whatever you need to do because this is dangerous stuff. it lasts through 8:00 on friday morning. the wind relaxes and it won't be quite as brutal. make sure your pet is not running around outside. the cold can take a toll on any living creature are within just a matter of hours. it feels like 15 in philadelphia, 4 below for the current windchill. why is this all happening? well, we have an unusual weather pattern shapi