The region is waking up to a warm morning again, with the upper levels now about to warm up in a big way to help set up the season's first heat event. Today marks the transition day as we're seeing some clouds around this morning, with a few showers to the north and northwest of Philadelphia. Those showers will stay safely away from the city but we do have some clouds at various levels in the atmosphere early this morning. As the sun works its late May magic and the upper level ridge continues to slowly exude its influence, the clouds should thin and a healthy dose of sunshine should break out.
Summery cumulus clouds will pop up later on and while a thunderstorm can't be ruled out later on today, the vast majority of the region looks dry this afternoon and evening as the necessary triggers for thunderstorm development are not great and are generally going to be localized and isolated in nature. One thing that marks the transition to a heat ridge in many instances is nighttime thunder and that is in the forecast, especially for our friends to the north as a complex of thunderstorms may roll across the northern fringes of the heat ridge (along and north of I-80?) after Midnight tonight.
The heat is definitely "on" tomorrow -- highs should top 90 in many locations away from the coast. Today probably doesn't get quite there but mid and upper 80's are definitely doable.
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