Sat 07:43 PM Update — Today’s HIRESW along with other models do support more shower activity on Sunday. Showers and thundershowers are possible anytime between 11 AM and 5PM Sunday. It appears that many areas around PHL will see some shower activity.
Sat 09:18 AM Update — Later runs of the NAM-NEST and two pre-release versions of the HIRESW do not support the heavy showers predicted by the HIRESW-ARW last night, as mentioned in my previous ‘update’.  The latest model blend (NBM) still includes the Sunday showers.

So there’s uncertainty in the forecast for Sunday.   I’ll keep an eye on this.

Fri 11:20 PM Update — Tonight’s HIRESW-ARW models show significant showers and thunderstorms on Sunday. This is a significant change in the forecast. I’ll update again over the weekend.

A Bermuda high pressure system off the southeast coast will bring increasingly warm and humid weather to our area. Weak disturbances moving around the periphery of the high pressure system will bring occasional clouds and slight chances of widely scattered showers and thundershowers.  Most of our area this weekend will be dry.


  • Cloudy early morning with a slight chance of a light shower. Clouds break for partly sunny/partly cloudy skies by late morning or early afternoon.
  • High temp 86.2º sd 1.3º. Dew points 66º-70º
  • Calm to very light winds from the SW 3-5 mph
  • Slight chance of a widely scattered shower late afternoon. Most areas are dry.

Sunday —

  • Some fog and clouds early.
  • Sunshine breaks through after 10 AM
  • High temp 87.8º as 2.3º.   More humid. Dew points 68º- 70º
  • Calm winds in the morning.  Light winds up to 10mph in the afternoon.
  • Chance of thundershowers late afternoon, far northwest areas. Philadelphia is expected to be dry.