When hail damage occurs to shingles, there may be severe granule loss, the shingles may lose material at their edges, and penetration is also possible. If wind is involved, then the damage becomes much worse. There have been several roofing and siding crews coming to Minnesota again this year ( Storm Chasers) Be careful who you pick when choosing a contractor. Minnesota Hail Damage service issues play a big part in the construction business. My best advise is for you the homeowner to hire a local Minnesota Roofing or Siding Contractor. This way if any problems arise in the future you can be fairly safe to assume your contractor will be around to address any roofing or siding problems. Minnesota Short Sale