Reverse trajectories (RT)
Mexico and southwest USA - This week, Grande Prairie (June 7) had the first report of a Reverse Trajectory crossing over southwest US and Mexico crossing. Other sites included Selkirk, Portage, Carman and Brandon.
Forward trajectories (FT)
There were 17 Forward Trajectories from southwest US (12) and Mexico (5) that were predicted to cross the prairies over the next five days.
Weather forecasts (7 day):
Grande Prairie: https://weather.gc.ca/city/pages/ab-31_metric_e.html
Downloadable versions of the Wind Trajectory Updates are available here.