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Moderate Rain (~25mm) and Flurries Across Southern Ontario to Start the Week

We are closely watching a system currently over the United States as it moves into Southern Ontario. This system is expected to bring a widespread 10-25mm across Southern Ontario including the risk of some flurries over portions of Southern Ontario.

Scattered showers will affect portions of Southern Ontario beginning late Sunday evening. Into the early morning hours, a more steady pocket of rain will push across the Extreme South and move into the Niagara region, including the GTA. Into the morning hours, much of Southwestern and Central Ontario, including the GTA and Extreme South will be engulfed in light to moderate showers. In the higher terrain areas, some light snow may mix with the rain. Into the afternoon, the rain may become scattered and may clear out of Southwestern Ontario as this system begins to swing into Eastern Ontario. Rain is likely to continue for portions of the GTA, Central Ontario and the Niagara region. Into the late evening hours extending into the early morning hours on Tuesday, moderate showers will continue in Eastern Ontario and linger in Central Ontario with a few pockets of light showers across the GTA and Southwestern Ontario. Into the morning hours on Tuesday, local showers will continue in Central and Eastern Ontario before ending.

Rainfall

Rainfall Forecast, for Southern Ontario. Issued May 12th, 2019.

Blue or '1':

Areas in the blue or marked with a '1' can expect less than 15mm of rain. This includes Essex County and Bruce County as well as a large portion of Lambton and Huron Counties. Portions of Middlesex County and the Municipality of Chatham-Kent are also included in this region, including the City of Chatham. Much of Northeastern Ontario including portions of Eastern and Central Ontario such as Algonquin Park, Parry Sound, Huntsville, and Britt are all included in this region. Most regions towards the south and east will see between 10 and 15mm while areas further west and north will see amounts towards 5mm.


Green or '2':

Areas in the green or marked with a '2' can expect between 10 and 30mm of rain. This includes a large portion of our region. In the Extreme South, this includes Rondeau Park, London, Long Point, Brantford, Lucan, and Woodstock. In Southwestern Ontario, this includes Kitchener and Waterloo, Mount Forest, Stratford, Listowel, Markdale, and Meaford. In Central Ontario, this includes Midland, Orillia, Haliburton, Woodview, and Collingwood. In Eastern Ontario, this includes Bancroft, Ottawa, Pembroke, Brockville, Cornwall, and Perth. Most areas should see between 10 and 20mm although local totals throughout the region will reach into the 30mm range.


Yellow or '3':

Areas in the yellow or marked with a '3' can expect between 20 and 40mm of rain. This includes the GTA including the Niagara region. This also extends east to include Belleville, Kingston, Prince Edward County, Peterborough, and Barrie. Most places should record between 20 and 30mm of rain with local totals near 40mm. An isolated place may see amounts just lower towards 15mm.

Snowfall


Blue or '1':

Areas in the blue or marked with a '1' can expect less than 3cm of snow. This includes portions of Southwestern Ontario such as Listowel, Stratford, Woodstock, Kitchener, Orangeville, Markdale, Newmarket, and Uxbridge. Areas across the higher terrain such as Shelburne and Orangeville may see near 3cm or very slightly over in the case that rain changes to snow for a longer period of time.


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