The haze that has been in the air off and on for the past week is associated with forest fires in Canada, but not in the same locations as last year. The smoke is from fires in the Pacific Northwest, especially from British Columbia. Last year the fires were from Saskatchewan. For the smoke from British Columbia to make it into the northern plains is a sign that the upper level wind flow has shifted from a more common northwesterly flow much of this warm season to a westerly flow from Washington and British Columbia. This subtle shift is one of the main reasons why there has been more rain events in the past 10 days then we had seen earlier in the summer.