Forcasters: Aurélie Dseroches-Lapointe & Jeremy Morris
Two surface low pressure systems are currently in vicinity of northwestern Canada, the first one being on the west shore of Hudson Bay, and the second over the Pacific Ocean off the coast of northen BC. A high pressure is also located south of the BC coast. No surface synoptic system is currently located in our area, so any precipitation occurring would be of orographic nature. This surface pattern seems to persist for the next few days, however higher levels patterns are moving across the continent.
Two troughs, at 500 hPa and 250hPa heights respectively, are currently over our study area, moving northeastwards and becoming more negatively tilted which correspond to the SE-NW direction. Additionally, high-level ridges (500 and 250 hPa respectively) are currently above the surface high pressure zone located over the Pacific Ocean that was mentionned before. These ridges are building up as they approach us in the next few days.