Apparently the T & L storm we sat out in Sioux Falls was bigger than we thought. I copied this from a news article on a Seattle TV station web page this morning.
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There was a massive thunderstorm that struck the town of Sioux Falls, South Dakota Thursday night, dumping rain amounts rarely seen and caused massive flash flooding. More than 7 inches of rain fell in part of town, according to KELOland.com, knocking out power to more than 2,000 people.
But it was the rate of rainfall that really caught my eye and you can imagine how so many people got stranded in instant flooding. A weather gauge in Sioux Falls found that at the storm's peak, 0.71" of rain fell -- in 5 minutes! To put that in perspective, that's about all of Seattle's average July monthly rain. Again, in 5 minutes.
But it was the rate of rainfall that really caught my eye and you can imagine how so many people got stranded in instant flooding. A weather gauge in Sioux Falls found that at the storm's peak, 0.71" of rain fell -- in 5 minutes! To put that in perspective, that's about all of Seattle's average July monthly rain. Again, in 5 minutes.
Here are some of their other totals:
5 minutes: 0.71"
10 minutes: 1.35"
15 minutes: 1.91"
20 minutes: 2.37"
25 minutes: 2.63"
30 minutes: 2.80"
That 2.80" of rain is just short of Seattle's annual summer rainfall average at 3.15". Don't worry, they eventually hit that 3.15" mark at about 75 minutes. That particular rain gauge ended up at 5.83" for the storm.
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