Big debris flow hits Chamoson, Switzerland – August 7, 2018
08/08/2018
A damaging debris flow hit the village of Chamoson, Switzerland late afternoon yesterday, August 7. It was caused by locally very intense rainfall, with surface runoff streaming into a channel in Chamoson.
Preliminary reports indicate 18 mm of rain fell in only 10 minutes and a total of ~50 mm in one hour. The reported data however, is from a weather station several kilometers away so locally there may have been even more rainfall.
Debris flows are a form of water-saturated mass movement, typically caused either by short, intense ranifall. Depending on the amount of bedload suspended in the flow, such events range from flash floods (with relatively little bedload) through hyperconcentrated flows to debris flows.
Numerous Tweets / Vids
Environment Canada issued a special weather statement for Toronto, Mississauga and Brampton at around 21:00 EDT on Tuesday, August 7, 2018, ahead of a slow-moving area of tropical moisture-fueled rain showers.
Parts of Toronto experienced widespread flash flooding shortly after as rain quickly overwhelmed drainage systems. Highways 400 and 401, the area near Allen Road, the downtown core and the Toronto Islands were the worst affected.
According to EC, approximately 50 to 75 mm (1.9 - 2.9 inches) of rain fell in the span of two to three hours across parts of the city but some areas received more than 100 mm (3.93 inches), which is more than the city receives during the entire month of August (average: 78.1 mm (3 inches)). However, many areas of Toronto received much less than 22 mm (0.86 inches) of rain, showing the very localized nature of the heavy shower.
Toronto Hydro said around 22:00 EDT they had lost their power supply from Hydro One and subsequently 16 000 customers lost power in the area of Finch Station and Steeles, Sheppard and Islington avenues. Power was restored to approximately 8 000 customers at around 22:30 EDT.
Multiple rescues carried out as torrential rain swamps downtown Toronto
The Weather Network ✔ @weathernetwork
Must see: Toronto swamped by torrential rains, flooding
Slow-moving rain showers absolutely drenched parts of the city Tuesday night, dumping more than 100 mm in less than 3 hours in very localized areas.
08/08/2018
A damaging debris flow hit the village of Chamoson, Switzerland late afternoon yesterday, August 7. It was caused by locally very intense rainfall, with surface runoff streaming into a channel in Chamoson.
Preliminary reports indicate 18 mm of rain fell in only 10 minutes and a total of ~50 mm in one hour. The reported data however, is from a weather station several kilometers away so locally there may have been even more rainfall.
Debris flows are a form of water-saturated mass movement, typically caused either by short, intense ranifall. Depending on the amount of bedload suspended in the flow, such events range from flash floods (with relatively little bedload) through hyperconcentrated flows to debris flows.
Numerous Tweets / Vids
Environment Canada issued a special weather statement for Toronto, Mississauga and Brampton at around 21:00 EDT on Tuesday, August 7, 2018, ahead of a slow-moving area of tropical moisture-fueled rain showers.
Parts of Toronto experienced widespread flash flooding shortly after as rain quickly overwhelmed drainage systems. Highways 400 and 401, the area near Allen Road, the downtown core and the Toronto Islands were the worst affected.
According to EC, approximately 50 to 75 mm (1.9 - 2.9 inches) of rain fell in the span of two to three hours across parts of the city but some areas received more than 100 mm (3.93 inches), which is more than the city receives during the entire month of August (average: 78.1 mm (3 inches)). However, many areas of Toronto received much less than 22 mm (0.86 inches) of rain, showing the very localized nature of the heavy shower.
Toronto Hydro said around 22:00 EDT they had lost their power supply from Hydro One and subsequently 16 000 customers lost power in the area of Finch Station and Steeles, Sheppard and Islington avenues. Power was restored to approximately 8 000 customers at around 22:30 EDT.
Multiple rescues carried out as torrential rain swamps downtown Toronto
The Weather Network ✔ @weathernetwork
Must see: Toronto swamped by torrential rains, flooding
Slow-moving rain showers absolutely drenched parts of the city Tuesday night, dumping more than 100 mm in less than 3 hours in very localized areas.
Fred Revel 
this Friday: Back to calm and sunshine often generous. Showers & Wind to the channel. A little fresh for the season. 
