Monthly Archives: October 2015
Philly Weekend Weather Forecast
The center of the cool high pressure system over us on Friday will shift to our east on Saturday, allowing warmer air to approach as a warm front later Saturday night into Sunday.
Saturday wiil start sunny and cool, but mid level clouds will move in early afternoon as the warm front approaches. High will be about 56. Moisture and dynamics are expected to miss us, so Halloween night should just be cloudy.
The warm front moves by early Sunday morning. Cloudiness early Sunday morning should break to partly sunny skies in the afternoon with very mild temperatures. High 69.
Point of uncertainty: Sometimes, the cloudiness associated with warm fronts linger longer than the models predict.
About the upcoming rain
An interesting scenario coming up, with moisture remnants of previous hurricane Patricia move up as a extratropical everyday low pressure system.
There are big differences in the models here, with the GFS cranking out an inch or more of (much needed) rain, but with the NAM model having the moisture and heavy rain missing us and moving to our west. The NAM has high pressure blocking the rain and keeping the low pressure to our west.
With the NWS and TV forecasters predicting heavy rain for Wednesday, this will be a good test of the NAM vs GFS models for precipitation in the upcoming winter. In such similar discrepancies last winter, the drier NAM model was the winner. We’ll see.