I like these detailed weather alerts.
Winter storm with heavy snow later Sunday and Sunday night, with mixed precipitation for some regions. Windy and sharply colder again Monday with some blowing snow and lake effect snow-squalls.
Old man winter is about to have another go at Southern Ontario as a winter storm developing over Oklahoma threatens the region.
A weak cold front from a separate weather system affecting Northern Ontario will slip into Southern Ontario tonight. This front will give a few centimetres of snow to many areas by Sunday morning, with 5 cm or more falling in locales east of Lake Huron to the south of Georgian Bay. This front will likely stall north of lakes Erie and Ontario on Sunday.
Meanwhile, a low pressure system developing over Oklahoma today will intensify and track northeastward along the line of the stalled front, crossing Southern Ontario Sunday night.
Some disorganized snow is expected on Sunday over some regions. As the deepening low approaches, the snow will become heavy over Southwestern Ontario Sunday afternoon and over the remaining regions Sunday evening. The snow will likely change to some rain near Eastern Lake Erie and Lake Ontario as well as parts of Eastern Ontario later Sunday evening. There is also a threat of some freezing rain in these areas. Any freezing rain that occurs will have virtually no impact on hydro for those areas impacted by the recent ice storm. But more significant freezing rain may impact travel to some degree over Eastern Ontario. Freezing rain warnings will likely be issued later tonight. The precipitation will taper off overnight Sunday or by early Monday in the east.
It appears that regions north of a line from roughly Leamington to London to Barrie to Pembroke will receive snowfall amounts of 15 to 20 cm. Amounts will likely be up to 5 cm south of that line with locally 10 cm in some areas.
In the wake of the storm, bitterly cold west to northwest winds will return on Monday, producing blowing and drifting snow in areas which receive the most snow from the storm. Furthermore, intense snow squalls are forecast to develop off Lake Huron and Georgian Bay Monday and persist into mid week.
Travel conditions are expected to deteriorate and become hazardous due to accumulating snow and poor visibility in heavy snow over Southern Ontario Sunday. If freezing rain falls, untreated surfaces may quickly become icy and slippery.
There is still some uncertainty as to the exact track of the storm centre and where the freezing rain and heaviest snow will fall. Environment Canada will continue to monitor this evolving situation and issue warnings accordingly.
It should be noted that widespread dangerous wind chills are likely especially from Monday night through Wednesday as some of the coldest air in years seems poised to settle across the region accompanied by brisk winds.
The public is advised to monitor future forecasts and warnings as warnings may be required or extended. Please monitor the latest forecasts and warnings from Environment Canada at http://www.weatheroffice.gc.ca.