Cool Weather will end soon...

The cooler than normal pattern will persist over the next couple of days, but things will change by the weekend. Many times when I look at overall patterns I'm struck at how the atmosphere resolves extreme situations. I've always noticed that when there is an extreme on one side of the country that begets an extreme on the other side of the country. Let's take the current situation for an example; temperatures are in the 100s in the west while the Great Lakes and most of the east have been in the 50s and 60s. So as soon as the warm air is dislodged in the west we will begin to watch our temperatures rise.




In this series of charts you can still see little waves of low pressure from the north moving across the area. Meanwhile high pressure from the Arctic is encouraging colder temperatures as well. One variable though is the strong May sunshine which will give us a boost in temperatures. Yesterday we didn't see that sunshine and temperatures stayed in the 50s.

Now as we begin to look at the medium range models and 850 mb temperatures we begin to see the warm air being dislodged by a developing weather system across the plains.
By Sunday you can see this air finally over spreads across the Great Lakes region with +18 to +22 Celsius temperatures.

It looks like another pattern change coming next week through with another arctic high moving across the upper Great Lakes.