Cool to Rule the End of the Week

Just a very brief post to confirm what most of you have already heard and that is the fact that cool air will invade PA later this week.  The first map below is from the global model GFS showing the 850 mb level which is about one mile above the surface.  This level tends to show the true movement of the air without surface effects; a truer metric of the air mass movement.  Now the trough is deep, but not as deep as originally believed earlier in the model runs.

The SREFs show the low temps Friday morning.  We will see many places locally in the upper 30s!  Remember, this is an average of many runs which tends to normalize the output.  As a result, temps could be a few degrees cooler than what you see here.

And here is one specific run that is often accurate in the short term.  So with light northerly winds and clear skies under a large area of high pressure, frost will most certainly occur as close to us in places of north central PA!  Also note how the lakes hold their heat and extend the growing season inland well into the fall.

Now this is a fall weekend all in these parts could use!  The map below is for Saturday morning.  Temps will be even cooler upon rising from our slumber Saturday am.

Have a good Tuesday....

Smitty

AA:  Cool air on the move for later in the week.  We will need to dodge some showers Wednesday afternoon as the real cold front passes through.