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 first week of May in 2003 had one of the worst tornado outbreaks on record in the United States.
Five years ago today, April 27, 2011, there were over 300 tornado reports in the Deep South. Today, I look at before and after damage aerials.
A major severe weather outbreak with long-track tornadoes and extremely large hail is forecast for today.
An anomalous reading from a tsunami buoy off the coast of New England has social media buzzing this morning.
With AcuRite's Environment Monitor, you can monitor conditions both the outside and inside of your house.
Welcome to the future. This morning, I found at least 20 different people broadcasting live scenes from the Houston Flooding via their cellphones and Facebook Live.