A wintry mix of snow, rain, sleet and freezing rain is making its way across the Delaware Valley, prompting multiple schools to close or delay opening on Thursday.

The BriefSnow will change to sleet, freezing rain and rain bringing some slippery conditions for morning commuters on Thursday.Many schools in the Philly area have began to announce delays and cancelations for Thursday.

The Edunomics Lab, which analyzes education finance and models district spending decisions, estimates that when a district has under-enrolled schools, closing 1 of every 15 campuses saves only about 4 percent of a district’s budget , largely in labor costs.