A blocked pattern has kept a deep ocean low pressure system affecting our weather to our east for several days. The same blocking has kept an even more robust low pressure system in the upper Midwest.
The ocean low pressure system will gradually progress eastward, allowing much of Saturday to have considerable sunshine before clouds move in again later in the afternoon. High 68.
The second system in the Midwest will slowly progress eastward and an upper air disturbance rotating around this system will move into our area on Sunday. Sunday will be mostly cloudy and several runs of the GFS have shown a chance of showers Sunday afternoon. High 67.
High pressure that brought delightful weather on Friday will drift to our east, allowing a return flow of warmer and more humid air to enter our area.
Saturday will be sunny and warm. High 85-86. Dew points will still be in the comfortable range.
On Sunday, a weak upper air trough moves through. Temperatures will increase as will humidity, with dew points moving into the more noticeable 60s. High temperatures near 87-88.
The weak trough may result in some cloudiness in the afternoon Sunday. Some weak vorticity also present. The models are showing light showers far to our west, with nothing moving in to the immediate PHL area. I’ll keep an eye on it.