It's that time of the year when the first killing frost/freeze hits central Pennsylvania. Typically, mid-October is when the first killing frost hits although light frosts can occur as early as mid-September.
Some areas of central Pennsylvania did have some frost in late September, but the duration of the frost and the extent of the frost did not kill most garden plants.
The cold air coming for Saturday morning will allow for a longer-duration frost and freeze and will also allow temperatures outside of the towns to dip will into the 20s, if not the teens.
The high pressure system bringing the cold weather originated in northern Canada and will park itself right over central Pennsylvania by Saturday morning. That will promote clear skies and calm winds which is the best setup for what meteorologist call "radiational cooling."
With the cold weather coming, you still have time to protect your plants. Covering them with buckets or blankets will prevent the frost from forming on the plants and may allow your plants to continue until the next threat of frost and freeze comes along.
Detroit will get a break from snow around the middle of the week, as milder air arrives for the city.
Warm air is forecast to surge into much of the eastern half of the nation by the weekend and will be accompanied by heavy rain and flooding risk in some locations.
As warmer air pays a brief visit to the Central and Eastern states, delays from rain, fog, ice and snow will be on the increase this weekend for early holiday travelers.
A parade of snowstorms has been taking aim at the U.S. recently, increasing the chances for many to see a White Christmas.
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A dramatic warmup is in store for Cleveland after days of frigid conditions in the city.
Bennet Bridge, NY (1975)
Lake effect snowburst; 34" snow.
Las Vegas, NV (1984)
Trace of snow fell.
New York City (1917)
Central Park: -1 degrees, earliest zero reading.