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.
A storm will bring snow and ice that will lead to slippery travel along a 1,500-mile swath from northern Arkansas and Georgia to Maine early next week.
The coldest air of the winter will plunge southward across much of the eastern United States and will feature single-digit and sub-zero temperatures in the Northeast during Valentine's Day weekend.
A blast of arctic air will be accompanied by flurries and even a localized wall of snow in some communities in the Northeast and parts of the Midwest at the start of the Valentine's Day weekend.
Heavy rain will raise the risk of flooding across more than a dozen states in the Southeast on Presidents Day to the East Coast on Tuesday.
Umbrellas will be needed on Valentine's Day as scattered showers overspread Germany.
As warming ocean waters continue to threaten coral reefs worldwide, researchers at the University of Hawaii have developed a plan that could reverse the rapid decline of these ecosystems.
Eastern US (1985)
Great Ohio Valley snowstorm whips snow into mountainous drifts and strands hundreds. In southwest Ohio 10 plows were stuck in the drifting snow and abandoned. Over a foot of snow in central and eastern Kentucky with 10 - 15 ft. drifts. Over 2 inches of snow in most of North Carolina.
Minneapolis, MN (1990)
String of 48 consecutive days with above normal temperatures broken.
Fairbanks, AK (1999)
-36 degrees; a record 19 straight days with lows less than -35 degrees.