An Alberta clipper storm system is forecast to track across southern MB Tuesday, bringing the potential of the season's first significant snowfall over portions of southern MB. The center of the storm is expected to move across the Riding Mtn area early Tuesday tracking through the northern Red River valley and into the Whiteshell by Tuesday evening. The heaviest swath of snow is expected along and north of this storm track.. putting the most significant snow along and north of the TransCanada where 10-15 cm is possible. Snowfall amounts will drop off sharply south of this track with 5 cm or less likely. Gusty northwest winds will follow in behind the system bringing a drop in temperatures by Tuesday evening, as well as areas of blowing and drifting snow in open areas. Snowfall amounts will depend critically on the exact path of this system, so stay tuned on the progress of this potentially first wintery blast of the 2009-10 winter season.
UPDATE: Latest model guidance has shifted the track of Tuesday's system further south. As a result, the heaviest snow is now expected to fall over southwest Manitoba and over the southern Red River valley into SE Manitoba where 10-15 cm is possible. Winnipeg is expected to lie on the northern edge of the heaviest snow.. with 5 cm possible. Note that Winnipeg may get heavier amounts of snow if this system tracks a little further north than latest projections. Stay tuned..