An upper cyclonic flow will continue to bring below average temperatures to Philadephia this weekend.

Saturday will be mostly sunny and still breezy and cold. High temperature will be about 46. (Average high is 54.)

(Fri 11:30 pm update-  some cloudiness in the afternoon Saturday)

Sunday will be sunny and winds will be light. High temperature warmer at 49.

[su_note note_color=”#ebf2d9″]So, what about this storm being talked about for next week?

As you’ve heard, this storm is expected to develop as a complex binary system that evolves from several areas of low pressure that redevelop off the coast into at least two secondary systems.

The forecast challenges are less about track or significant differences in the models; it’s more about the intrinsic complexity of modeling complex binary systems. Indeed, the statistical models show surprisingly strong agreement this far out.

As always, the devil is in the details, specifically about the rain/snow line and precipitation type.

Here’s what the forecast currently looks like — a mix of freezing rain, sleet or snow develops before daybreak Tuesday.

The precipitation changes to rain in Philadelphia on Tuesday but may remain as sleet mixed with snow in northern and western suburbs. The precipitation will be heavy at times. Precipitation changes to snow late Tuesday or Tuesday night before tapering.

A brief hiatus early Wednesday before mixed precipitation restarts Wednesday and changes to all snow late Wednesday afternoon into evening, ending before daybreak Thursday. Some accumulation expected with each round, more on grassy surfaces than roadways. An ugly two day period.[/su_note]