Synopsis:
The cold front that was originally forecast to pass through Northeastern U.S as predicted by the models has already passed the State of Pennsylvania this morning. A much cooler air mass has over spread the region. Today will feature mostly cloudy skies and a few scattered showers across the Commonwealth. The high temperatures will be around low to mid 50s today. The week will feature the passage of several cold fronts. A weak cold front will be approaching the region on Wednesday, but mostly of the computers do not support a lot of moisture with it. Only expect a few passing clouds during Wednesday's cold front passage. A stronger cold front will approach on Thursday. However, the strength of this cold front is yet to be determined. The WRF short-range model has the cold front on the stronger side with a considerable cold air advection behind the cold front. The GFS and the ETA models do not show such a strong cold front only with moderate cold air advection.
Short-Term (Monday-Tuesday)
The cold front that was predicted to pass through our region Monday evening is already to our south. Much cooler air is already above us. The radar images show some scattered showers passing through the State in the wake of the cold front passage. So generally expect mostly cloudy skies with scattered showers throughout Monday. The temperatures will be on the cooler side. The showers will become less numerous Monday night. Some gradual clearing is expected on Tuesday with partly cloudy skies.
Mid-Term (Wednesday-Wednesday night)
The weather conditions will remain calm on Wednesday even with the approach of another cold front. This cold front will be relatively weak and moisture starved, so do not expect any unusual weather events with this cold front. The skies will remain partly to mostly cloudy Wednesday night in response to the passage of the weak cold front.
Long-Term (Thursday-Friday)
Another stronger cold front, the third of the week, will be approaching the region from Southeastern Canada on Thursday. Clouds and few showers will develop on Thursday and continue into Thursday night ahead of this cold front. The front will be through the region Thursday night with some gradual clearing expected on Friday. There are some discrepancies between the guidance models regarding the set up and the strength of this trough. The shorter-range WRF has the cold front on the stronger side with a possible surface low developing along the digging trough. This will give us a higher chance of rain showers on Thursday. On the other hand, the GFS and the ETA models have the trough slightly flatter with no surface low developing along the trough, suggesting that the showers will be more isolated in nature on Thursday.
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