There will be one more day of unusually warm temperatures across central and southern Alberta as a ridge of high pressure lingers over the province on Thursday. An incoming Pacific low-pressure system will kick off a change in the upper pattern and begin to modify temperatures for the weekend. Ahead of that low, there will be more cloud cover across the lower half of Alberta and stronger wind with sustained speeds around 20 km/h in Calgary and gusts up to 40 km/h. Along the northern edge of the Rockies, there is a good chance of moderate to severe thunderstorms forming later in the day, Thursday, in areas where the incoming cooler air slams into the warm and stable air mass under the ridge. Some of those storms between High Level and Edson could develop into supercells as they track toward Edmonton. The next chance of rain in the Calgary area will come late on Saturday and early Sunday. Daytime highs in Calgary will continue to drop over the next few days before reaching a seasonal 21 C on Sunday. The forecast should be fairly consistent for the early part of next week before more unsettled weather and cooler temperatures leading into the long weekend.
