Cooler Now; But What About 1st of August? - WKRN News 2

Cooler Now; But What About 1st of August?


We are enjoying some unusually cool temperatures for late July! 

But how long can it stick around?

A look at the predicted upper air (jet stream) patterns can give us a clue to what August will start out like.

The general rule of thumb is a trough of low pressure aloft brings cooler temperatures here at the surface, and a ridge of high pressure brings warmer temps.

The graphics to the right are taken from the ECMWF model.

It would make sense that today's upper level winds at about 18,000 ft. show a well defined trough, hence cool temps.

However, look at how by the end of the week, the high pressure ridge has extended eastward from Texas.  That means the return of 90s.

BUT, there is hope for next week!

The ECMWF shows another trough that should bring down another cold front by early next week. 

The GFS (the other extended forecast model) shows it a little sooner (next Saturday night).  While the ECMWF is a little later (Sunday night).

Either way, IF they verify, after returning to 90s late this week we could see another break from the heat early next week.


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