A freeze warning is in effect for the entire Tri-State area, effective from 3 a.m. to 9 a.m. Tuesday, the National Weather Service reported Monday.
Overnight temperatures are expected to drop below the freezing mark in Washington County, as well as Franklin and Fulton counties in Pennsylvania and Berkeley, Jefferson and Morgan counties in West Virginia, the weather service said.
The expected freeze ends a weeks-long period of unseasonably warm weather in the region.
In Hagerstown, the mercury hasn’t dropped below the freezing mark (32 degrees Fahrenheit) since March 11, according to local weather observer Greg Keefer’s website, i4weather.net.
Since then, the high temperature has reached at least 60 degrees every day through Sunday, topping the 80-degree mark three times, according to Keefer’s site.
The weather service advised that vegetation that is sensitive to freezing will be at risk for damage.
“More significant damage to vegetation will occur in locations where temperatures drop below 28 degrees for three or more hours,” according to the NWS.