In Colorado at least three people are dead, streets are flooded, and mountain towns are isolated after days of heavy rain caused flash flooding that is expected to continue Friday.
"In Boulder, the rainfall record for September set in 1940 was shattered," Keith Coffman of Reuters reports.
Surging Boulder Creek floodwaters, coming from Boulder Canyon above the city, are now running through its heart.
"There's so much water coming out of the canyon, it has to go somewhere, and unfortunately it's coming into the city," Ashlee Herring, spokeswoman for the Boulder office of Emergency Management, told Reuters.
The torrent triggered the evacuation of some 4,000 residents late on Thursday.
"There's no way out of town. There's no way into town. So, basically, now we're just on an island," Jason Stillman, 37, who was forced to evacuate his home in Lyons at about 3 a.m., told The Weather Channel.
It's clear why some people are stranded:
Here's a video:
The caption for the photo below reads: "This was the bear creek bike path earlier today just a few blocks from the house and Olmec office. This is now multiple feet higher and going over the road the photo was taken from!"
"If anyone is free to help tomorrow. A friend of mine could use some. This is his living room."
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"Traffic is impossible during yesterday Thu. 12 sep. 2013"
"In Boulder we don't have streets but creeks"