LONDON, Ont. -- A snow squall warning has been issued for London, including all of Middlesex County as a fresh intrusion of arctic air envelops the Great Lakes.
Daytime highs this time of year should be close to 8C.
Snow squall warnings are also in effect for Oxford, Huron, Perth and Grey and Bruce counties.
Snowfall amounts will vary under squalls, in London we could pick up five to 15 centimetres of snowfall.
Northwest winds off Lake Huron are generating bands of heavy snow which will continue in the area Tuesday night.
Arctic high pressure will build overnight and will shut down snow squalls Wednesday afternoon as winds shift southwest.
Temperatures will plummet Tuesday night, and records will fall in parts of Southern Ontario.
The record in London was -9.5C set back in 1977, but the low temperature around 8 a.m. Tuesday was a chilling -10.3C.
The forecast low in London Tuesday night is -12C with a wind chill of -20C. The record set back in 1977 was -12.8C.
Cold air remains locked into through Saturday, with milder temperatures returning on Sunday.
Buses run in London, cancelled elsewhere
Sorry kids, but buses were running as usual in London and surrounding areas on Tuesday while many other areas in the province saw cancellations.
Much of the province saw its first significant snow of the season but for London this was round two.
Bus cancellations are in place in many areas from Windsor to Toronto, however the London region has been mostly spared.
Buses are running in London, Middlesex, Oxford, Elgin and Huron-Perth.
However school buses were cancelled in all eight zones for Chatham-Kent and Sarnia-Lambton.
- With files from CTV London's Justin Zadorsky
