A fairly string cool front will push into the area this weekend and bring a couple of mornings with lows in the 40’s. The Storm track image below shows the upper level trough that is dragging in the cooler air. Frost is possible in the Midwest and perhaps northern PA by Sunday morning.
There will probably be another warm up to above normal temperatures later next week, because the long range models are indicating well above normal temps in about 12-15 days. The forecast below is based on an average of 51 long range model forecasts from the European Centre for Medium Range Weather Forecasting (ECMWF). Research shows that this gives a better forecast than any one model. Each model run is given very slightly different initial starting points, and this method has greatly improved long range forecasts. While we cannot give details on any individual day, we can usually make a decent forecast of whether temperatures will be above or below average and to a lesser extent precipitation.