Friday's chance of showers will be mainly in the afternoon, as the atmosphere heats up and creates instability. With winds from the southwest, temperatures will climb into the mid 90s, with a heat index approaching 100. Afternoon showers are expected to develop near or along the Blue Ridge and track east into the Piedmont. Coverage is expected to be scattered, and the chance of a shower or storm at the track is about 30% at this time.
The chance of rain increases on Saturday as a cold front moves southward across Virginia. There are some disagreements among the models regarding the coverage of showers with this front, and the timing of the best chance of rain is still uncertain this far out. The expected cloud cover and frontal passage will bring temperatures down from Friday's highs, but the humidity will still be quite high.
The passage of the front on Saturday is expected to be followed by a more pleasant air mass on Sunday, as high pressure over the northeast builds southward into Virginia and the Carolinas. Under mostly sunny skies, highs will be in the lower 80s, with more comfortable humidity levels.