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 USGS has released hundreds of thousands of aerial photos taken after Hurricane Matthew from Florida to the Carolinas- here are examples and instructions.
The four-day barrage of storms hitting the Pacific Northwest did a lot of damage. But if you believe AccuWeather.com readers, it never happened. I delve into why.
I said last night on Twitter: "Bermuda, I hope you're ready for Hurricane Nicole." What was a Cat 2 is now a Cat 4!
Hurricane Matthew is no more as of Sunday afternoon, but the flooding from the storm will continue as rivers rise. Here's a summary of the "greatest hits" from the storm:
Hurricane Matthew is making his closest approach to the Florida Coast this morning and there is hyperbole on both ends of the media scale.
Hurricane Matthew has been upgraded to a Category 4 storm and is on its way to an unprecedented bounce up the southeast U.S. coast.