The National Weather Service issued an updated freeze watch at 11:19 a.m. on Wednesday valid from 10 p.m. until Thursday 10 a.m. for Mercer, Venango, Forest, Lawrence, Butler, Clarion, Jefferson, Beaver, Armstrong and Indiana counties.
The weather service says, "Sub-freezing temperatures in the upper 20s to lower 30s possible."
"Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing," explains the weather service. "Take steps now to protect tender plants from the cold."
What to do if there is a freeze watch or warning
Freeze warnings are issued from May to October (but can be extended if necessary), when low temperatures are expected to be 29-32 degrees. If there is a potential for temperatures to fall into these thresholds, a freeze watch may be issued a few days ahead of time.
According to the weather service, if a freeze warning or watch is issued for your area, there is little you can do to protect plants. If you can move your sensitive plants inside, do so because the freeze will likely kill them, depending on the severity of conditions.
Advance Local Weather Alerts is a service provided by United Robots, which uses machine learning to compile the latest data from the National Weather Service.