Showers and Storms This Week

High pressure will be moving offshore today, which will lead to stormy weather for the next few days. Today, however, will be a nice day with a mix of sun and clouds and a high near 70 degrees. The normal high for this time of year is 71 degrees, so that is right about where we should be for early May.

On Tuesday, a low pressure system from the Midwest will merge with another low pressure system in southern Canada between Lake Erie and Lake Ontario. Associated with this low pressure merger, a warm front will move through the area on Tuesday. Above this warm front, in the higher levels of the atmosphere, a disturbance will also move through the area and spawn some thunderstorms by the late afternoon or early evening hours. Assuming the sun stays out for a good portion of the day before the thunderstorms develop, we should warm up into the mid-70s, but if there is extra cloud cover it could be a bit cooler.

As a cold front moves through Tuesday night into Wednesday, more thunderstorms are likely under gray skies. The high on Wednesday will be in the lower 70s. On Thursday, a weak disturbance in the upper levels of the atmosphere could spawn a shower or two, and with a mix of clouds and sun temperatures should be close to normal, near 70 degrees.

High pressure will build in at the surface on Friday, but there will still be a weak disturbance in the upper levels, so I will keep just a 20 percent chance of a shower in the forecast. It will be a bit cooler on Friday with a high in the mid-60s. High pressure will finally build in aloft by the weekend, so the weekend will feature bright sunshine with high temperatures in the mid-70s.

Check in with Phillyweather.net throughout the week for updated forecasts. Have a great week!