Overview
- Environment and Climate Change Canada issued a snowfall warning for parts of northern Ontario, calling for about 15 cm and periods of near‑zero visibility.
- Environment Canada cautioned the Ottawa area could see 3 to 15 cm on Sunday from a developing low, noting low confidence in exact amounts and affected zones.
- The Weather Network projects 5 to 15 cm for parts of southern Ontario if the storm tracks south, with minimal accumulation in downtown Toronto and the Golden Horseshoe and higher totals north of Highway 401.
- The National Weather Service placed Cook County, Illinois, and Indiana’s Lake and Porter counties under a Winter Storm Watch, citing lake‑effect bands Sunday night into Monday with 1 to 6 inches possible and a risk to the Monday morning commute.
- Forecasters expect a rain‑to‑snow transition Sunday as colder air arrives, initial sticking mainly on grassy and elevated surfaces, and localized heavy lake‑effect bands into Monday that could create slick roads, reduced visibility, and scattered tree‑branch issues from wet, heavy snow.