More sun today than I expected based on the GFS model forecast yesterday. (The GFS model was updated by the NWS this past Wednesday.)
Clouds start moving in 2-3 PM. Thunderstorms appearing likely as early as 5 PM and increasingly likely during the period from 5PM to 9 PM.
For Sunday, much of the day rain-free, but thunderstorms again appear likely late afternoon into evening.
Last night’s NAM did very well in predicting the showers that formed to our south and moved through.
The cloudiness is keeping maximum temperatures below those originally forecast today.
Today’s NAM shows the possibility of more light showers moving through from the south about 5 PM today. Sunday is looking mostly dry at this time.
The latest NAM just in shows showers early Saturday morning, ending late morning. This is a significant change from previous model runs.
As forecast, a weak disturbance is approaching today, with cloudiness and a chance of very light showers during the afternoon.
Exact timing of these light showers is difficult, but early afternoon, about 2 PM, is a best guess.
Somewhat heavier precip is possible in the far northern suburbs of Philadelphia this afternoon.