Another hot and humid day for the Delaware Valley with temperatures back up into the lower 90's. Tomorrow, hotter and more humid weather has prompted the National Weather Service to issue a Heat Advisory for Philadelphia and the counties surrounding, with the threat of heat indicies reaching levels the upper 90's with no real relief at night. Also for the next three days, the Storm Prediction Center has placed all or part of the are under a slight risk for severe weather, with scattered pop-up thunderstorms possible. Any one of these storms could have heavy, localized rain, gusty winds, small hail and frequent cloud-to-ground lightning. Right now, some scattered storm are crossing through the region right now, some possible severe.
Tonight, mostly cloudy with scattered storm ending by late night. Still humid with lows in the lower to mid-70's. Winds will be out of the southwest at 5 to 10 mph. Tomorrow, another day in the lower 90's means it's an official heat wave. Hazy sunshine and more humidity means the Heat Advisory will start at 11 am. More scattered thunderstorms are expected in the afternoon as well, and some could be severe. Highs will generally stick in the lower to mid-90's across the area, except far north and west, where some relief could be found. Winds will be out of the west at 5 to 10 mph, with stronger winds in some thunderstorms.
Thursday, some places could be back into the lower 90's with more humidity and hazy sunshine. More storms could develop throughout the day. Lows will still remain in the lower 70's. Friday, skies will stay mostly cloudy. Temperatures will drop below the 90-degree mark but it'll still be humid. Humid, in fact, through the rest of the weekend. Saturday and Sunday will both be unsettled. We're not talking all day precipitation, but scattered showers and thunderstorms could drop a quick half inch to inch of rain. Highs both of those days will be in the upper 80's with lows around 70-degrees. Monday could be impacted by more precipitation, so don't put the umbrella but we could see more in the way of sunshine. We'll still be plagued by unsettled weather on Tuesday and temperatures ease back into the mid-80's.