Scattered showers and isolated thunderstorms are likely this afternoon and this evening, particularly across New Jersey and Delaware. There are already a few out and about. This development is occurring as a cold front will continue to drift eastward. Most of these thunderstorms will produce torrential rain and some cloud to ground lightning, but some could produce strong gusts of wind and hail.
The cold front will likely move little once it reaches the coast early Sunday. Some of the model guidance develops a wave of low pressure along the front. This would enhance the showers and thunderstorms along the boundary on Sunday, especially in the morning. The most likely place for the heaviest precipitation will be just offshore. However, our coastal communities may be scraped by at least some of this. There could be a nice sky cover gradient between mostly sunny skies in our western areas and cloudy and damp conditions in our eastern areas during the first half of Sunday. Some afternoon and evening clearing is certainly possible from west to east as this slow moving front finally pulls away. Sunday Evening & Monday will feel quite nice with falling dew points.
On Tuesday, another cold front should approach the region late. This will yet again provide for the chance of showers and thunderstorms, but not until later in the afternoon and evening hours. The cold front will pass through the region on Wednesday, continuing the chance for showers and thunderstorms. Drier air will hopefully come in for Thursday, followed by another frontal boundary with waves of energy for the first half of the weekend.
For temperatures later this week, most areas will top out in the mid to upper eighties this week. However, a few of the urban centers have a shot at hitting 90 or 91 degrees once or twice this week.