There are interesting differences in last night’s models regarding the chance of showers/thundershowers this evening. (Sunday evening)
An upper air disturbance drops down into our area this evening, between 7PM and 1 AM. The NAM has been consistent in keeping any showers far to our north. One version of the WRF with NAM physics (WRF-NMMB) also does the same.
The GFS (and its similar physics version, the WRF-ARW) has showers and thundershowers making it in to the Philadelphia area towards midnight, then dissipating. It will be interesting to see which model does the best here.
Either way, today will be hot and slightly more humid. Highs 91-93 with dew points near 60.