Today’s models over-predicted showers for our area but they’re still showing showers for tonight.  (I guess we’ll see.)

For Saturday and Sunday, both the GFS and NAM models now show little in the way of showers.  The statistical models maintain an elevated background probability of precipitation of 40% through much of the weekend. So a shower is still possible each day, most likely in the late afternoon.

Saturday will be mostly cloudy warm and humid. High 85. Dew points near the uncomfortable 70 degree mark. Most of the day should be dry.

Sunday will feature more sunshine.  Highs near 86 with similar high dew points. Most of the day should be dry.

An easy and high confidence forecast, as a Bermuda high pressure system brings a southwesterly flow of increasingly warm [hot] and humid weather to the Philadelphia area this weekend.

On Saturday, some broken clouds in the morning will be followed by sunshine and warm temperatures.  High 83.

For Sunday, a dramatic change in temperatures, with high temperatures around 93.  It will be sunny and increasingly humid.

Dewpoints on Sunday will be in the mid to upper 60s, making the hot temperatures more uncomfortable.  A dramatic change from the cool pattern we’ve had for the past few weeks.

An upper air cyclonic flow has been providing the low humidity and cool conditions we’ve been enjoying.

The upper air low in Canada has re-established itself again, similar to last weekend, and it will rotate small disturbances (areas of vorticity) through our area on Saturday and Sunday.

Friday evening update in italics below-

For Saturday,  a disturbance rotates through early Saturday morning with some clouds and a chance of a brief shower before 9 AM.   showers may linger until 11 am.  Skies clear quickly later in the morning and much of the day will be mostly sunny and pleasant.  High near 75.

Fri evening: Updated Sunday cloud  forecast below- 

Sunday starts with midlevel cloudiness, Sunday starts sunny and dry, but clouds thicken during the afternoon, as another disturbance rotates through later on Sunday.  This disturbance will induce the development of a diffuse surface low that will bring scattered showers for late Sunday afternoon and evening.   High 80.

As was the case last weekend, timing and intensity of upper air features are difficult for the models to get exactly right. Expect some updates.

A cool, unsettled and showery period of weather is expected for the coming week.