Calgary returns to the 20s this week

Frost advisories in our province ended early Tuesday morning and I don't expect them to return to southern Alberta, though central Alberta may see a couple repopulate once again. We set in to high pressure and this weak blocking pattern for the next few days. Yesterday, the descriptor was banal. Today, I'm going with benign. The blocking pattern in question is the result of a pair of flanking lows aloft; neither will concede ground for a while. It's known as an Omega Block, where a high centres