You should never wait. If your roof is in the condition where it can’t withstand a storm and you know that, then your roof needs to be replaced this moment. Predicting when extreme weather will happen is something that not even sports handicappers are willing to take into consideration weeks and months in advance.
If you have damage caused by a storm and you are going to have another storm hit very quickly, the easiest thing to do is to apply high quality synthetic underlayment with self-sealing nails over the affected area where the leach exists overlapping so that the higher level starting from the bottom of the roof and overlapping as you go up so that the water never hits a seam where it can get under it without having to reverse directions and go uphill.