
Many cities around the Great Lakes have storm warnings like Toronto’s tonight:
Winter storm warning for: City of Toronto, issued at 6:46 p.m. EST Tuesday 5 February 2008: snow with ice pellets and freezing rain expected tonight and Wednesday. This is a warning that dangerous winter weather conditions are imminent or occurring in these regions. Monitor weather conditions.. Listen for updated statements.
Yet another moisture-laden winter storm is moving towards Southern Ontario. The low pressure centre has moved into Southern Missouri this evening and as it moves northeastward towards the Ohio Valley tonight it will tap into a lot of moisture and energy from the Gulf of Mexico. Thus it is likely that this low will intensify into a significant winter storm as it moves into Southern Ontario tonight and Wednesday. The leading edge of the large precipitation shield from this storm has arrived in Windsor near 6.17 p.m. this evening when a cold rain started to fall there.
Although this storm seems to be following the script of many previous winter storms this season, this one will be a little different. As the low tracks northeastwards tonight, strengthening northeast winds are forecast to tap colder air from a building Arctic high pressure ridge over Northern Ontario. This will set the stage for a band of potentially significant freezing rain south of a line from Sarnia to Hamilton and a mixture of snow and ice pellets from Goderich towards the greater Toronto area to just north of Lake Ontario. Regions farther north will likely receive some snow but below the warning threshold of 15 centimetres per 12 hours.
The precipitation will continue to advance quickly northeast this evening and envelop much of southern ontario by dawn, making for a potentially hazardous Wednesday morning commute.
A relative break in the precipitation lasting about 6 hours is expected to pass through southern Ontario during the late morning to early afternoon. during this break freezing drizzle and patchy freezing rain will improve visibilities but may cause icy conditions to persist.
During the late afternoon hours the precipitation will intensify again and switch over to snow heavy at times with about 5 to 10 centimetres on tap across most districts.
Significant ice accretion over areas south of a line from Sarnia to Hamilton and total snowfall amounts of 10 to 25 centimetres north of this line can be expected before this storm exits the region late Wednesday.
Travellers should be prepared to alter plans accordingly again as driving conditions once again will deteriorate significantly on Wednesday. Dangerous winter driving conditions from very low visibility in bursts of heavy snow are anticipated. Untreated surfaces may also be icy and very slippery as a result. Environment Canada continues to closely monitor this situation.














