Environment Canada

Environment Canada

May 01, 2007 12:00 ET

Environment Canada: Ontario Weather Review

April 2007

TORONTO, ONTARIO--(CCNMatthews - May 1, 2007) - Winter may have started late this year, but for the people in Timmins it ended late, too. Timmins recorded an all-time April snowfall record of 84.8 centimetres this month. Approximately 33 centimetres of snow was reported on April 4 and it just kept coming. The snow finally stopped mid month, and mostly melted away by April 20.

Elsewhere in Ontario, this past month was unremarkable except for the Northern Ontario areas that reported above-normal precipitation. There were a few locations across the province that reported drier-than-normal conditions, but these were limited to Southern Ontario.

Temperatures ended near normal for the month, with a few locations reporting values almost two degrees below normal. As is typical for April, the start of the month started on a cooler note than the end.

Severe Weather

The month began with a stark reminder that April is still a winter month in a good portion of Northern Ontario. On April 1, a low pressure system moved up from the American Plains States and brought rain, freezing rain and ice pellets to portions of Northwestern and Northern Ontario.

Following close on the heels of this first storm system, another disturbance moved up from the American Midwest on April 3, 4 and 5. This storm lived up to its billing as a true winter storm by blanketing the majority of the regions north of Lake Superior and through Northeastern Ontario with snow. The snow was driven by strong gusty winds from the north, which caused widespread visibility reductions and cold windchills. When all was said and done, some locations in Northeastern Ontario received 25 to 30 centimetres of snow from this event, with Wawa reporting 40 centimetres.

Eastern Ontario got its own late taste of winter on April 15 and 16. A very intense storm system working its way up the U.S. Eastern Seaboard spread an area of rain over portions of Eastern Ontario on April 15. However, as colder air began flooding down from the north with this system, the rain changed to snow. Snow continued through to early afternoon on April 16, leaving some locations with upwards of 20 centimetres of fresh snow. This represented record one-day snowfalls for mid-April in some locations.

As the month wound down, Southern Ontario got a taste of more summer-like severe weather. On April 23, after enjoying a stretch of unseasonably warm weather, a sharp cold front drove down from the northwest and generated a long line of intense thunderstorms. Many localities in Southern Ontario experienced snapped tree limbs and downed power lines as some of the thunderstorms produced powerful wind gusts in excess of 100 kilometres per hour, along with driving rain. Some of the hardest-hit areas were just to the north of Toronto in the Vaughan and Markham areas, where a number of trees were uprooted, hydro poles snapped, a warehouse under construction was toppled and a solarium at the back of a home was ripped from the home and carried across the street to be deposited in a neighbour's pool.

To finish off the month, on April 29 another well-defined cold front swept through Northwestern Ontario. In behind the front, there were occasional strong wind gusts from the northwest. The airport at Thunder Bay recorded a peak wind gust around midday of 78 kilometres per hour. The winds caused downed power lines, leaving a few thousand residents in the Thunder Bay area without power.



Record snowfall readings (in centimetres):

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Location Precipitation Normal Difference Previous
Record
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Timmins 84.8 27.5 57.3 79.0 (1996)
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Unusual precipitation readings (in millimetres):

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Location Precipitation Normal Difference Wettest Since
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Timmins 97.4 52.8 44.6 1996
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Chapleau 90.6 46.3 44.3 1996
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North Bay 102.8 67.2 35.6 1996
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Petawawa 92.5 61.8 30.7 2005
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Ottawa 103.0 72.4 30.6 2005
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Kapuskasing 83.6 53.9 29.7 2001
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Location Precipitation Normal Difference Driest Since
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Sarnia 42.5 75.4 -32.9 2004
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Toronto City 38.5 69.6 -31.1 2004
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London 51.6 82.2 -30.6 2001
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Waterloo Wellington 48.0 76.9 -28.9 2001
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(Egalement offert en francais)

Contact Information

  • Environment Canada - Ontario
    Jack Saunders
    Communications Advisor/Media Relations
    (416) 739-4785
    Website: www.ec.gc.ca