High pressure will give us a picture perfect weekend. Sunny skies and cool temperatures for both Saturday and Sunday! Doesn’t get much better!
High on Saturday 72. High on Sunday 73.
An early evening update on Irma- the track through Florida continues with a more westward trend. The ECMWF (European) has been the best performing model with an average 2 day error of about 30 miles in storm position. The other models are having an average error of 60-70 miles in 2 day forecasts.
It would not surprise me if Irma’s track moves even further westward.
The highly diminished remnants of Hurricane Harvey will bring showers and rain to the Philadelphia area on Saturday. Currently the GFS are only showing about 0.20 inches of rain for the daytime on Saturday, but the NAM shows considerably higher amounts during the mid afternoon. (Heavier rain is expected further south into Delaware during the day on Saturday.) High only 67.
The latest models have decreased the rain QPF for Saturday night.
For Sunday, skies clear slowly with some sun and clouds although the models still show a chance of a sprinkle late afternoon. High 77.
Monday will be very nice with sunny skies. High 82
Of interest is a new hurricane, IRMA, which may pose a threat to the New Jersey Shore sometime during or likely after next weekend. (Sept 11 timeframe.) Way too early to be sure about anything with this storm. The models have changed many times over the past few days regarding the timing. It does look like IRMA will be a major hurricane.
A blocking pattern across the US continues to give us mostly sunny skies and cool temperatures. It’s also expected to stall the dangerous hurricane Harvey over Texas.
For Philadelphia, a large area of high pressure will drift over us on Saturday, and very slowly move east on Sunday. Saturday will be mostly sunny and pleasant with high temp around 79. Some cloudiness may move in late afternoon Saturday , just like today.
Saturday evening, winds will shift to an easterly flow and winds will remain from the east on Sunday.
The models are showing sunny skies for Sunday, but an easterly flow this time of year sometimes brings in more cloudiness than predicted by the models. Confidence in the cloud cover for Sunday is below average. Highs still expected around 79.