Saturday, May 12, 2012

Forecast for Sunday, May 13, 2012

Tonight will be a night with a few clouds, especially towards dawn, and light winds. On Sunday, there will be an increase in cloud cover as the day unfolds. A weak cold front will be approaching from the west and this front could increase the chance for showers and thunderstorms in the afternoon and evening hours, especially across the Lehigh Valley, Poconos, and Central Pennsylvania. The front will probably be too far west for activity to make it any further east and the loss of daytime heating will also tend to diminish any activity by that point.

The cold front will move closer to our region on Monday, before becoming nearly stationary or completely stalling out. We have a post about the early week event below. There is the potential for some heavy rain at times as waves of low pressure travel along the boundary.  A secondary cold front will swing through on Wednesday with additional showers and thunderstorms. The fronts are expected to finally push offshore on Thursday. However, high pressure building in late in the week may develop an onshore flow and we could end up being stuck in the clouds with drizzle and fog for late in the week and potentially part of the weekend. Confidence on the timing of the onshore flow is low, so I went with a more optimistic forecast for now.