We've been talking about it for a while, and it's finally just about here. The big pattern change arrives tomorrow, thanks to a potent cold front. Meanwhile, the entire upper-level weather pattern will enter into what's known as an omega block, because the orientation of the jet stream looks like the Greek letter omega. The block will be located over the western U.S., allowing a steady stream of cool, Canadian air to spill into the Midwest. We'll be sandwiched right between the clockwise spin of a high pressure and counterclockwise spin of a low pressure. Be ready for some cool days ahead!
This pattern will hold for at least the next several days, as it's difficult for an omega block to either move or break down. The GFS computer model breaks it down as early as Thursday, although it has a tendency to rush things with these patterns. Our other long-range computer models keep us in the chill through at least next weekend.
2 comments:
If this was like in late december, early january, would this mean some really nasty cold stuff if this omega block happened then.
If it were positioned just a bit further west, it'd be awful to have around during the winter. Little clippers every few days with reinforcing shots of cold air. Yikes!
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