August 28, 2021, Saturday morning 11:23 AM – Lock Saint-Jean level is particularly low since the beginning of August, forming one of the most worrying in the last 70 years.
This level is expected to reach 12.6 feet in September.
This is the fourth lowest water level since 1953.
Painted the driest water in the last 70 years due to unfavorable weather conditions.
The Lock Saint-Jean watershed is very large, covering an area of about 70,000 km2. The major rivers that flow into Lake Saint-Jean are the Ashuvamushuan, Mistassini, Paribonca and Metabetchaune, which represent about 90% of the lake’s water supply. According to the Lock-Saint-Jean Watershed company.
Each of its rivers enjoys a lower level than usual, and this reality has an impact on the lake: the latter being the main outlet to its area. There is a shortage of water throughout this vast territory.
Spring flooding is moderate and very early due to light spring. The lake stopped on April 16 for the first time since 1945. Locke Saint-Jean therefore generally limited the water supply he could take advantage of at this time.
Then came the drought. The rivers that feed the lake were unable to fill the deficit that had accumulated in the spring.
July slightly eased the dry trend: Roberwall actually got 108.6 millimeters of water per month, with an average of 115 millimeters per month.
August however the drought took the torch. Robbery is only eligible for about twenty millimeters of water, while the normal number is 101 millimeters per month. Result: The lake level will reach 13 feet by the end of August and will drop further by the beginning of September.
A similar scene in Quebec
The rest of Quebec did not survive a significant drought in August. With the exception of the Gaspe tip there is a significant deficit in precipitation in southern Quebec.
The most obvious example is in the northwestern part of the province: Abitibi-Témiscamingue has received just two millimeters of rain since the beginning of August, averaging 80 millimeters. A similar situation is occurring in Montreal, with twenty millimeters of water falling since August 1st.
If rain is likely to soften the picture over the next two days, there is no indication that it will be enough to cover the large deficit.
Keep in mind that the low pressure system will attack Quebec between Saturday and Monday, with the risk of good precipitation and thunderstorms in the background.