In a remarkable meteorological turn of events that's not altogether unusual for the month of October in Pennsylvania, the Lehigh Valley has gone from enjoying highs above 80 to being placed under a National Weather Service freeze watch in the span of about a week.
Some of the coldest air to be felt in the Saucon Valley in recent years is moving into the area, as a storm system that dropped a couple inches of powdery snow departs.
An outbreak of Arctic air has invaded the Northeast and Saucon Valley, with temperatures plummeting well below freezing and forecast to fall even lower in the coming days.
If you enjoy the sight of ice on top of the bubbling fountain in Hellertown's Detwiller Plaza, you can expect to see some later this week, forecasters say. Cold air is on the way.
If you have houseplants or tender vegetation outside you may want to cover it or bring them inside tonight, as patchy frost is possible after midnight tonight.
The National Weather Service has issued a frost advisory for Northampton and Lehigh counties that will be in effect from 4 to 8 a.m. Monday morning.
