Motorists may experience some tricky travel conditions Tuesday morning as two storm systems are expected to combine over the Northeast just in time for rush hour.

The National Weather Service has issued a winter weather advisory for Carbon, Monroe, Berks, Lehigh and Northampton counties from 1 a.m. to 1 p.m. Tuesday.The advisory states that snow and periods of freezing rain will occur during that time.A total of two to four inches of snow is expected during the overnight hours as a storm system from the west pushes eastward. It is then expected to change over to freezing rain between 7 and 11 a.m. This changeover is due to a southern storm system that is traveling northward, bringing warmer air with it.As the storm continues to push northward, meteorologists are expecting that there will be another changeover to just rain during the midday and early afternoon hours. Temperatures will also rise to near 40 as the storm moves up the coast.Rain is expected to continue until around 10 p.m. Tuesday night, with temperatures hovering in the mid-30s.There is a slight chance for rain or snow showers Wednesday morning as the storm pulls away from Pennsylvania. No significant accumulation is expected. Temperatures will continue to hover in the upper 30s that day, before plummeting back into the 20s by the end of the week.