After a hail storm, it's always a good idea to walk around your house and inspect what you can to find out what you need to tell the roofing company when you contact it for an appointment. The problem is, these DIY inspections often concentrate on the main sections of the gutter, the visible parts of the roof, and the flashing. There are three other areas you need to look at to see if there is damage that might need fixing. These three sections can be the source of a lot of trouble if you overlook them and decide the roof doesn't really need repairs.
When you inspect the gutter, look at any corner baffles and see if they are dented. The problem here is that, if the baffles have been moved or dented, they might not stop the flow of water coming out of the nearby roof valley. Baffles stop this fast flow of water from overshooting the gutter and drowning your landscaping; the water hits the baffles and diverts into the sides of the gutter that flank the baffle. But if the baffle is bent, it might still let some of the water in future rain storms shoot out into your yard. If the baffle looks like the only thing that needs repair, you might be able to replace it, but if you see damage there, it might be a good idea to call a repair company anyway for further inspection.
These are the planks that rest on the sides of the roof along peaks, as if they're mimicking rafters inside the crawlspace. Hail doesn't always come down straight. It can come down at an angle, and if it hits the barge rafters or the edges of the roof, that can allow water to leak into the crawlspace during the next blowing rain storm.
The Ground by the Downspouts
If you have an old asphalt roof, hail and rain can wash asphalt granules off the roof and through the gutters and downspouts. Even if you saw nothing in the gutters near the roof, check the ground by the bottom of each downspout and look for little black granules (you may have to wait for the soil to dry out more so that the mud won't camouflage them). If you see them, that's a sign those asphalt shingles have been damaged.
Contact a roofing company if you see anything that may look like damage. Better safe than sorry after a hail storm.