A weak warm front will move in before daybreak on Sunday. Some scattered showers before daybreak. Clouds early will break for sunshine by afternoon.
As a result of this warm front, Sunday will have noticeably higher humidity (dew points) than Saturday. Dew points will move back into the uncomfortable 70º range.
Today’s models have the weak front moving through earlier on Sunday afternoon than previously forecast. Latest models have scattered showers and thunderstorms developing in western suburbs as early as 2 PM. High temp tomorrow 89.4º 88.3º± 1.2º Dew points uncomfortable, near 70º
Most models have the activity diminishing as it moves into NJ.
I love looking at the clouds and seeing what they tell about the model weather forecasts. Today’s approaching warm front is visible on water vapor imagery. Latest water vapor imagery is can be seen at this link.
Friday’s Weekend Weather Forecast had so many updates, it’s difficult to comb through. So here’s an updated Sunday forecast:
High pressure will build back in on Sunday, A flow of increasingly hot and very humid air, typical for the end of June and beginning of July, will begin to affect us on Sunday and beyond.
Mostly sunny, hot and increasingly humid. (Dew points in the uncomfortable upper 60s to above 70º!) High temp 90.3.º sd 1.3º (NBM Blue Bell)
There’s a chance of early to mid afternoon widely scattered showers northwest (Reading) and in central NJ.
Update Sun 11:59 AM— This morning’s models continue to show the chance of early to mid afternoon showers in central NJ and areas north. The HIRESW models seem to be overstating the rain. But Satellite Water Vapor shows a disturbance moving south that may interact and create some showers.
Temperatures on Monday, Tuesday and Wednesday will be even hotter, with temps 91º-94º with high dew points.
The original forecast for Sunday can be found here.
I’m trying to decide if I’m going out on that bike ride today. The forecast for periods of clouds with light, scattered showers early afternoon still holds. The latest HRRR has the axis of showers more into NJ, while the RAP maintains the track through Philadelphia.
Latest RAP (RApid Refresh) model simulated radar forecast with accumulated rain (white contours), 2PM