From the National Weather Service

Weather Alert
Special Weather Statement issued April 5, 2021 at 9:27AM EST by NWS Philadelphia - Mount Holly

...Increasing Fire Danger Today... Dry fuels, low relative humidity, warm temperatures, and gusty southwest winds will produce favorable conditions for wildfires to ignite and spread this afternoon through early evening. Residents are urged to exercise caution handling any potential ignition source...including machinery...cigarettes...and matches. Be sure to properly discard all smoking materials. Any dry grasses and tree litter that ignite will have the potential to spread quickly.
A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely.
A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain.
An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent or likely.