UPDATE: Thanks to a commenter, here is an article with more videos from this thunderstorm.
This YouTube video showed up in my mailbox this morning, as a "Top 5 Most Viewed" video, and it now has over one million views:
I did some research (for our news story) to determine what wind conditions caused this incredible event. On Aug. 14, winds were sustained as high was 41 mph gusting to as high as 60 mph from the north-northwest during a thunderstorm between 2:45 and 4:00 p.m. local time at both Calgary International (graphed below) and Calgary/Springbank airports:
According to Google Maps & Street View, the location of the driver would have had a north-northwest wind behind him, which meant it was blowing perpendicular to the street sign's horizontal support bar -- not unlike what happened when winds perpendicular to the Tacoma Narrows bridge ("Galloping Gertie") caused it to crash in 1940 (except then it caused twisting, not simple bouncing up and down). This is my guess anyway, I'm by no means an expert on Aerostatic Fluttering; if you are, leave me a comment below. One YouTube commenter said that the bad engineering of signs spanning too many lanes contributed to the problem.
The flooding situation in China continues to worsen and it may now be the second-worst disaster to ever hit the nation.
This week is the 20-year anniversary of Hurricane Bertha, and I met her at the coast of North Carolina.
Here's a public service announcement poster I've created to ensure that kids are being "thunderstorm safe" with Pokemon GO.
On Friday evening, a line of severe thunderstorms knocked down hundreds of trees and cut power to Wilkes County, NC.
Fifteen years ago, residents in the Southeast had no idea that Tropical Storm Allison would go on a nine-state rampage, flooding communities for over two weeks before finally moving out to sea.
We had a small heat burst last night in Bradford, Pennsylvania, when a collapsing thunderstorm sent the temperature up by 5 degrees around midnight.