If you’re living in an area that has flash flood warnings then you’re getting them because they can happen and probably have happened in your area, and probably do happen from time to time when the conditions are right. “Flash flood” doesn’t necessarily mean that an entire geographical region will be placed underwater (as @zenvelo said, “It won’t be Minot, ND.”), but there are flood channels in your area that are prone to flooding quickly and without warning, sometimes when it’s not even raining where you are.
Again, that’s not like North Dakota, where the floods can often be predicted weeks in advance.
You should learn the geography of your locale, and find the places that do flood so that you can understand why the warnings occur. That way you’ll also know the places to avoid or watch out for when the warnings are given.