This weekend’s weather has been even more stellar than had been forecast. High pressure built in from the NE even more than expected and the forecast of a humidity increase did not occur. Dew points have been in the 40s today and our high temperature of 85 felt extremely comfortable.
The GFS is still predicting an increase in humidity and temperatures for Monday, Labor Day. High temperatures are expected to hit 90, but dewpoints expected to remain in the somewhat comfortable lower 60s.
The ultra short range models (HRRR and LAMPS) haven’t been doing too well predicting the morning showers today (Saturday) in Philadelphia. A line of showers/thunderstorms went to our north through Bucks county and another area of showers is fallling apart to our south.
The actual warm front boundary is very diffuse, but based on dew points, it’s just to our west and south. The GFS-based LAMPS still maintains a chance of showers between now and 4 PM, but it’s hard to hang your hat on that forecast.
If the warm front passes through and we get breaks of sunshine, instability alone could trigger scattered showers, but predicting location is going to be even more difficult than this morning’s forecast when we had a distinct trigger.
Sunday is still looking to be sunny, hazy, hot, humid and dry.