Friday, January 06, 2012
Pattern change to colder weather by middle of next week..
Long range guidance is beginning to show signs of a pattern change to colder weather over southern MB by Wednesday of next week. After another surge of mild Pacific air with above freezing temperatures over southern MB on Monday, a large Arctic airmass will begin to flood into the northwest Prairies by Tuesday. This colder airmass will spread into southern MB by Wednesday in the wake of a low pressure system crossing the International border Tuesday that will bring some snow to southern MB.. possibly 2-5 cm. After Wednesday, long range guidance is suggesting a spell of below normal temperatures over southern MB through next weekend into the third week of January, which would mean daily highs of -15C or colder, and lows of -25C or lower. How long this cold spell will last is not known. The AO index remains positive, which suggests that the spell of cold weather may not last long.. and there is considerable uncertainty in the 2 week forecast. But colder weather appears to be on the way for a little while.. which will be good news for people looking for more typical January weather to finally arrive in southern MB.
Posted by rob at 10:42 PM