Dallas derecho

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somethingfunny
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Re: Dallas derecho

#21 Postby somethingfunny » Thu Jun 18, 2009 12:19 pm

Dionne wrote:Well folks, whatever the event is being called....one thing is for certain, it really played havoc with air travel through DFW. When we finally had a window to get out......it was still stormy enough to cancel the beverage service. Climbing through 21K we encountered some of the heaviest rain I can remember in 50+ years of air travel. It's no wonder Dallas flooded.


Hey, I was at DFW Airport on the 10th too! We probably saw each other as we milled up and down Terminal A in boredom! :lol:

For some reason I'd neglected to check the weather radar before our flight because the NWS had been calling for a "30%" chance of rain that day. As soon as we got through security I saw the wall cloud rolling over the airport through the big glass windows and I sat and watched the storm until the gate agents told everybody to get away from these giant triple-paned windows because of the tornado warning. DFW's Terminal A is a huge soundproof building that even the sound of a jet aircraft taking off or landing can't penetrate...we still were able to hear the thunder inside, that's how loud the storm was! At one point I saw an airplane at the gate bouncing up and down like it was on hydraulics in the middle of the storm. I was wondering what maintenance they could possibly be doing in all of this until the rain cleared a bit and I saw the plane behind it bouncing up and down too! :eek:

The worst part was that our flight to Sacramento still hadn't left its' starting point in Oklahoma City. Eventually they did find another airplane to use that got us to Sacramento, only about four hours late. More storms were rolling in around 11:30, but they weren't severe and we were allowed to get off the ground. That was also the first time I've ever flown through a thunderstorm. I wish I'd gotten pictures of that....



Then the next day I was watching The Weather Channel in Sacramento and saw something about a "Dallas Disaster!tm" but I figured it was just the usual hyperbole. :roll:
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Re: Dallas derecho

#22 Postby senorpepr » Thu Jun 18, 2009 1:22 pm

cheezyWXguy wrote:I'm just wondering, if that's not a derecho, what is? could you give me some sort of criteria?


According to the National Weather Service criterion, a derecho is classified as a band of storms that have winds of at least 50 knots (58 mil/hr or 93 km/hr) along the entire span of the derecho, which occurs over a time span of at least 6 hours.


There has to be an indication that there were at least 50KT sustained winds throughout the entire life of the storm--lasting at least six hours.
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mcallum177
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#23 Postby mcallum177 » Thu Jun 18, 2009 11:19 pm

Incase anyone is interested here is a video of the section of storm that went over my town! 8-)

http://www.youtube.com/watch?v=ThVzTwI7 ... re=related
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Re: Dallas derecho

#24 Postby cheezyWXguy » Fri Jun 19, 2009 12:33 am

senorpepr wrote:
cheezyWXguy wrote:I'm just wondering, if that's not a derecho, what is? could you give me some sort of criteria?


According to the National Weather Service criterion, a derecho is classified as a band of storms that have winds of at least 50 knots (58 mil/hr or 93 km/hr) along the entire span of the derecho, which occurs over a time span of at least 6 hours.


There has to be an indication that there were at least 50KT sustained winds throughout the entire life of the storm--lasting at least six hours.

There were severe warnings for winds of at least 50-60kt since the storm initialized in west texas around noon. It hit us with 70kt at about 730pm, and definitely continued with severe winds through the rest of texas, into AR and LA before falling apart later that night...so that well over 6 hours, close to double that. But, i have no idea how large that span of winds was, but judging by the radar that day, it was a decently large bow, i just dont remember how much of it was severe. Regardless, a good portion of it maintained severe warnings.
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