Tonight a cold front will move south through Pennsylvania and stall out. A low pressure system will set up just southeast of Pennsylvania and that will cause the winds to some out of the northeast. An easterly component to the wind will bring in cooler air form the Atlantic Ocean to Central Pennsylvania.
Wednesday will have a wide range in temperatures throughout the Central Pennsylvania. The eastern counties will be much cooler than the western counties. We will experience a weather phenomenon call Cold-Air Damming. This is when cool dense air gets stuck in the eastern county’s valleys. The cool dense air has a very hard time getting over the mountain and heading into our western counties. The eastern counties will be stuck in the low to mid 60s while the western counties will be in the low to mid 70s.
Thursday will have a similar set up to Wednesday. High pressure will be east of us over the Atlantic Ocean. This high pressure will bring in cooler air to Central Pennsylvania. Again, we will see Cold-Air Damming. The eastern counties will be cool and cloudy. The western counties will be warmer with a mix of clouds and sun. A warm front will approach the region and that will help the western counties warm. There will be scattered showers and thunderstorms throughout the afternoon and evening. The eastern counties will be stuck in the low to mid 60s while the western counties will be in the low to mid 70s.
Friday will be warmer with the highs in the low to mid 70s for all of us. The warm front will bring in warm air. The winds will be out of the west southwest. We will tap into the warmer air form our southern states. Scattered showers and thunderstorms will continue throughout the day.