When a bad storm or sudden cold snap is arriving soon and time is of the essence, use the design described here to quickly build an adequate temporary shelter. You'll need a cardboard box (cardboard is actually good insulation), duct tape, shredded newspaper, a pair of scissors and either a plastic drop cloth that's 3 millimeters thick (a common item in the paint department at Home Depot or a hardware store) or contractor trash bags at least 3 millimeters thick.