Exacta Weather's James Madden said: "A White Christmas will be dependant upon the exact arrival of colder weather but some places could still see that single flake of snow during the 24 hours of Christmas Day", he said.
"And after Christmas Day looks like seeing stronger winds which could push 70mph". Highs may again climb past 50 degrees, especially Saturday when mid 50s aren't out of the question.
Rain is likely, mainly after noon, on Thursday, when a high in the mid- to upper 40s is forecast. This could lead to the coldest weather so far this season Christmas Eve and Day. The snow would be occurring well on the back side of a storm that will be well to our east.
As we all know, it is still a week away, so there remains quite a bit of uncertainty with this forecast, so be sure to monitor this forecast daily to help keep your holiday as safe as possible. Thursday will feature highs only in the mid-30s but it won't be as windy as an area of high pressure briefly moves overhead. Much colder air will spill across the Ohio Valley shifting our pattern to a much colder one.
We'll be able to better reap the benefits of the warm sector on Tuesday, as southwest winds increase, the sun has a little more luck at breaking through the clouds, and temperatures respond and soar to near 50 degrees by afternoon. Friday night's low will drop to around 15.
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Christmas in the Lehigh Valley may turn out more wet than white, at least if you had to make an educated guess by looking at current models.
For now, plan on unsettled weather continuing into early next week.
As cold approaches for Christmas, AccuWeather said one scenario shows it holding back, while the other bringing it along the mid-Atlantic coast.
Monday - Christmas Day: Forecast confidence is even lower, but rain showers are a reasonable concern from Virginia south to Florida, and some ice or snow may fall in parts of the Appalachians and inland Northeast.