London and southern Ontario face two distinct short-term hazards: a Friday system forecast to drop 5-20 cm of snow and Wednesday’s earlier freezing rain, ice and snow event that closed schools and cancelled buses. This comparison asks which storm creates greater travel disruption, and how the difference in precipitation type shapes responses in London and neighboring regions.
Friday system hitting Ontario: southern Ontario and London outlook
A quick-moving, cross-country low will arrive in Ontario on Friday, bringing a 5-20 cm snowfall across much of southern Ontario. Snowflurries are expected to begin Friday morning, stretching from the Lake Huron shores into London and the Greater Toronto Area, with snowfall rates increasing Friday afternoon and evening. Travel hazards will rise as roads turn slippery and visibility may be reduced, so drivers should allow extra time for commutes. Some snow could change to rain by Friday evening in places including Windsor, London and Niagara.
London Ontario Weather: comparing Friday’s snow to Wednesday’s freezing rain
Wednesday delivered a freezing rain, ice and snow event that prompted school closures and cancelled buses, illustrating the acute disruption caused by glaze and ice accumulation. Friday’s forecast differs in type and distribution: instead of glaze, southern Ontario is slated for mainly snow and measurable accumulation of 5-20 cm. Using the same measures—impact on travel, disruption to institutions, and geographic reach—Friday’s event threatens slower but more widespread slowdowns, while Wednesday’s freezing rain produced immediate slipperiness that shut down services.
Colorado low, Ottawa movement and Monday winds: what the divergence reveals
These two events stem from different storm behavior and timing. The Friday system is described as originating on the West Coast and moving through the Prairies before targeting southern Ontario, while Wednesday’s freezing rain event produced concentrated ice impacts that forced school closures. Snowfall from Friday then moves east into Ottawa late Friday evening and continues into Saturday morning, after which a brief break arrives on Saturday but with blustery, below-normal temperatures. Forecasters are watching a Colorado low for Sunday that could bring additional impactful snow and rain to the region.
Monday will turn very windy and colder, with bands of lake-effect snow developing and continuing through Tuesday. Temperatures are expected to rebound during the second half of next week but could trend colder again during the weekend. The structural difference—the Friday system’s heavy snow bands and an eastward march into Ottawa versus Wednesday’s localized freezing rain—explains why the hazards and operational responses differ between events.
Applying consistent criteria across both events clarifies consequences. On the measure of accumulation, Friday’s 5-20 cm forecast creates routine but significant plowing and visibility challenges; on the measure of immediate closure or cancellation, Wednesday’s freezing rain already produced tangible disruptions such as closed schools and halted buses. On geographic spread, snowbands will affect a broader swath from Lake Huron through London and the GTA, while freezing rain impacts were more concentrated where glaze formed.
Finding: the direct comparison shows Friday’s snow is likely to produce widespread travel slowdowns similar in scale to Wednesday’s disruptions, but through different mechanisms—accumulating snow and reduced visibility rather than surface glaze. The next confirmed event that will test this finding is the Sunday Colorado low, which forecasters are closely watching for additional impactful snow and rain. If Friday delivers the forecast 5-20 cm and roads become slippery with reduced visibility, the comparison suggests transport disruptions and slower commutes across southern Ontario that echo the societal impacts seen after Wednesday’s freezing rain.
