{"id":157428,"date":"2023-04-13T15:43:02","date_gmt":"2023-04-13T19:43:02","guid":{"rendered":"https:\/\/mrcpontiac.qc.ca\/?p=157428"},"modified":"2023-07-01T13:03:59","modified_gmt":"2023-07-01T17:03:59","slug":"public-safety-information-bulletin-msp-spring-flood-watch-2023","status":"publish","type":"post","link":"https:\/\/mrcpontiac.qc.ca\/en\/public-safety-information-bulletin-msp-spring-flood-watch-2023\/","title":{"rendered":"Information Bulletin from Public Security (MSP) – Spring Flood Watch 2023"},"content":{"rendered":"

Unofficial translation<\/em><\/p>\n

Information Bulletin – April 13, 2023<\/strong>
\nRegional Direction of Civil Security and Fire Safety of the Outaouais<\/p>\n

Monitoring spring freshet conditions 2023<\/h2>\n

Flood expertise table<\/h4>\n

During the spring freshet, the Minist\u00e8re de la S\u00e9curit\u00e9 publique (MSP) coordinates a flood expertise table to allow authorities to monitor the situation and anticipate any issues that may arise. This table, which meets weekly, is made up of experts from various departments of the Quebec and Canadian governments, as well as organizations such as Hydro-Qu\u00e9bec (HQ) and Hydro-M\u00e9t\u00e9o.<\/p>\n

Following the meeting of Thursday, April 13, here is the important information that the experts had to transmit to us for the greater Outaouais region.<\/p>\n

Weather conditions<\/h4>\n

According to experts at Environment Canada, the temperatures forecast for the next 3 to 4 days will be above seasonal norms, both during the day and at night, which will significantly accelerate the melting of the snow. Fortunately, no precipitation is expected on Friday, Saturday and Sunday. As of Monday, April 17, a system from Ontario will bring precipitation (in the order of +\/- 25mm) which may affect the St. Lawrence Valley more. The Outaouais should be relatively unaffected, but we can still expect to receive light precipitation during the day on Monday. The rain will be accompanied by a drop in temperature, which will slow down the melting of the snow. I invite you to consult the temperature forecast table for the next 2 weeks (reference point = Maniwaki):<\/p>\n

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In terms of longer-term temperature forecasts (next 4 weeks), the week of 17-24 April 2023 is the most likely period to see above-normal temperatures. The following weeks will be mostly within the seasonal normals.<\/p>\n

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Predicted probabilities (%) of above and below normal temperatures. Left: week 17-24 April, right: week 24 April-1 May.<\/p>\n

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Predicted probabilities (%) of above and below normal temperatures. Left: week of May 1 to 8, right: week of May 8 to 15.<\/p>\n

On the precipitation side, the next week, April 17-24, will be marked by the weather system mentioned above, but the probabilities are that the following weeks will be marked by precipitation at or below the seasonal norm.<\/p>\n

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Predicted probabilities (%) of above and below normal precipitation. Left: week 17-24 April, right: week 24 April-1 May.<\/p>\n

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Predicted probabilities (%) of above and below normal precipitation. Left: week of May 1 to 8, right: week of May 8 to 15.<\/p>\n

Impacts on watercourses and reservoir management<\/h4>\n

In the region, the snowmelt expected in the next few days is likely to have a significant impact on rivers where the response is more rapid. Peak flood levels could approach or exceed the minor flood thresholds for the Picanoc (Saturday) and Petite-Nation (Sunday) rivers. The consequences that can be anticipated for these sectors are :<\/p>\n