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Some will have it worse than others. Here's what to expect.

Days of rain ahead in Ontario

Daniel Martins
Digital Reporter

Sunday, April 13, 2014, 4:55 PM -

Water levels are running high enough already in Ontario, and they're about to be swollen by several days' worth of rainfall.

Some showers already washed the south of the province Saturday night, with more to come on Sunday.

A slow moving frontal boundary has set in across the south of the province, and Quebec also.

"Significant rainfall is expected along the boundary, with 20-degree temperatures and a risk of thunderstorms to the south," Weather Network meteorologist Gina Ressler says.

The worst will fall along a long line from the shores of Georgian Bay stretching well into Quebec, with lesser, but still significant amounts, further south and north.

Rainfall warnings were widespread along those parts of the province, while a special weather statement for rainfall was in effect elsewhere, which included the National Capital Region and most of the Greater Toronto Area.

The City of Toronto itself, however, was not included, as amounts there and in the Niagara region are not expected to be significant, compared to communities along Lake Huron, Georgian Bay, and stretching west inland.

For areas north of Sudbury, however, initial rain will soon switch to snow, as temperatures fall.

Up to 15 cm could fall in parts of the Nickel Belt through to Monday night, although there were no snowfall warnings in effect anywhere as of early Sunday morning.

The first thunderstorm warnings of the season

Generally, though, this system is bringing a surge of warm air to the region, with temperatures in southwestern Ontario expected to reach the low-20s on Sunday, and in southeastern Ontario and Quebec by Monday.

But that warm, humid air has a downside, in the form of thunderstorm risk.

No severe thunderstorm warnings are currently in place, although a severe thunderstorm watch and warning was briefly in effect in the Sarnia area Saturday evening - incidentally, the first of the season for Ontario.

Any thunderstorms that pop up Sunday and Monday will be a headache for people already dealing with rising water levels.

In eastern Ontario, the city of Belleville declared a state of emergency due to flooding risk, continuing this weekend, and other communities and conservation authorities province-wide are keeping an eye on their watersheds.

And after Sunday's toasty temperatures, things will rapidly cool down, as a vigorous cold front sweeps across the region Tuesday, changing any rain to wet snow.

TUNE IN: We're keeping an eye on the situation as it unfolds. Tune on TV for regular updates!

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