UPS - Adverse Weather Conditions? Its Partly Cloudy and Sunny?

My brother in law works for UPS and said the Oklahoma City sort facility had something like 30-40 semi trailers full of back log packages. He said they had employees coming from the DFW area in order to get the back log stuff moving. So if you had a package that transited through the OKC facility it may still be coming just a little (real) late. He said it could take several weeks to sort through.