Environment Canada has ended its snow squall warning for Watford, Pinery Park and east Lambton.
The weather agency was monitoring squalls that were expected to impact areas along Highway 21.
Snowfall accumulations of 10 to 20 centimetres were possible by late morning.
Conditions improved at mid-morning, and the warning was ended just before 11 a.m.
School buses in Zone 1 are cancelled on Friday due to inclement weather.