Through November persistent, vast blocks of exceptional water deficit are forecast in the east. Primarily moderate deficits are expected from southeastern Saskatchewan through southern Manitoba and into Ontario. Areas of more intense deficit include a band across central Manitoba, the upper and middle reaches of the Athabasca River watershed in Alberta, and around Prince George, British Columbia. Intense surpluses are forecast near Fort McMurray, Alberta and Kamloops, British Columbia.
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The forecast through October indicates some retreat of exceptional water deficits, especially in southern Saskatchewan and Manitoba where deficits are expected to downgrade, becoming mild to moderate. Deficits will shrink in British Columbia around Prince George, though remain exceptional; will downgrade somewhat in Alberta and along Ontario’s eastern border; and will shrink in Quebec but remain widespread. Exceptional surpluses in southern BC will diminish.
Exceptional water deficits are forecast to decrease, though vast blocks will persist. These areas include: Quebec from the Caniapiscau Reservoir to the St. Lawrence River; surrounding Lake Mistassini, QC; Ontario’s eastern border; northeastern Manitoba; the Lower Athabasca River region in Alberta; surrounding Prince George, British Columbia; and, northwestern BC. Intense surpluses will persist from northwestern Saskatchewan reaching west to Fort McMurray, Alberta, and in southeastern BC.
Exceptional water deficits are expected to decrease but will persist in many areas, including along Ontario’s eastern border. Surpluses are expected northwest of Toronto, and moderate deficits from Peterborough to Ottawa. In Quebec, deficits will be extreme around Sherbrooke. Severe deficits are forecast for southern Manitoba. Deficits will be intense in the Upper Athabasca and Lower Peace River Regions of Alberta, and surrounding Prince George, BC. Surpluses will increase in southern BC and will be exceptional around Kamloops and Kelowna.
Two transitions stand out in the near-term forecast: a change from water surplus to deficit in northern Quebec, and the emergence of widespread, exceptional surpluses in southeastern British Columbia. Deficits will diminish overall but are forecast along Ontario’s eastern border; in northeastern Manitoba and north of Lake Winnipeg; in northwest Alberta and north and west of Edmonton; around Prince George, BC, and in northwest BC. Surpluses will emerge in eastern Quebec near the mouth of the St. Lawrence River, and will increase along the northern border of Alberta and Saskatchewan.
Water deficits are forecast for much of the eastern half of the country and will increase on the Ontario/Quebec border corridor. Widespread, intense surpluses will emerge in southeastern British Columbia (BC), particularly surrounding Kamloops and Kelowna. Intense deficits will continue to emerge around Prince George, BC. Deficits in the Upper Athabasca Watershed of central Alberta will intensify, becoming exceptional. Exceptional surplus conditions will persist from Fort McMurray, Alberta to Churchill Lake, Saskatchewan, and around Fort St. John in the Peace River Region of northeastern BC.
Widespread, intense water surpluses will emerge in southern British Columbia. Northern Quebec is expected to transition from surplus to normal conditions and moderate deficit. Nearly normal conditions will return to Northern Ontario’s Albany River region. Significant deficits are forecast along the Ontario/Quebec border corridor, surrounding Lake Mistassini QC, the Upper Athabasca Watershed of central Alberta, and surrounding Prince George, BC.
The forecast through April indicates water conditions much the same as in the prior three months, with some overall shrinkage of anomalies in the eastern half of the country. One notable difference is the emergence of widespread intense surplus conditions in southern British Columbia. After April, much of the eastern half of the country will transition to deficit, retaining exceptional deficits in eastern Quebec, central Quebec, and the central Quebec/Ontario border. Deficits in the western provinces will diminish slightly, and intense surpluses will persist in parts of southern BC.
The near-term forecast indicates a pattern of water anomalies much like the prior three months. Widespread surpluses will continue in northeastern Quebec, central Ontario, west of Lake Winnipeg in Manitoba, near Churchill Lake in Saskatchewan and into Alberta, the central border of Alberta and British Columbia, and southeastern BC. Deficit areas include: central Quebec and the Ontario/Quebec border; northwestern Ontario into central Manitoba; and southern Manitoba and southeastern Saskatchewan. After March, surpluses in Quebec and Ontario will transition to deficit.
Widespread water surpluses will continue to emerge in northeastern Quebec and surpluses are also forecast for central Ontario, west of Lake Winnipeg in Manitoba, near Churchill Lake in Saskatchewan, and the central border of Alberta and British Columbia. Exceptional surpluses are forecast around Kelowna, BC. Significant areas of deficit include: the Ontario/Quebec border; from Calgary, Alberta northeast and from Banff into British Columbia; and, Prince George, BC. After February, surpluses in Quebec and Ontario will normalize, widespread surpluses are expected in southern BC, and moderate deficits will emerge from Lake Superior eastward past Montreal.