At this point a totally sunny and warm 4th is pretty much locked in. That is a win when comparing to some of our analogs like 1988, 2010, and 2016. All of those years had highs in the 60s at SEA on the 4th.
06Z EPS and control run also went in that direction with a stronger ridge at 144 hours.
The model inconsistencies appear to be related to the handling of that large vortex over northern Canada and how interacts with the ULL to our west.
Clouds on the increase today and a good bit warmer than yesterday with temps reaching the low to mid 80's. Rain chances increase late tonight through tomorrow. Best chances for heavier rain would be tomorrow night with a cold frontal passage. Much cooler again for Monday with temps slowly warming as we head toward July 4th.
Chester County records for today: High 103 degrees at Phoenixville (1934) / Low 45 degrees at Coatesville (1988) / Rain 3.88" at West Chester (1973)