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Started By
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re: Severe Weather Info Thread (LA, MS, AL, FL)
Posted on 2/24/16 at 5:03 pm to Goatofgoats
Posted on 2/24/16 at 5:03 pm to Goatofgoats
Multiple tornados in NC.
1
Posted on 2/24/16 at 5:18 pm to Janky
Not surprised. I posted a model sounding last night that suggested a very dangerous set up in NC and Va.
Posted on 2/24/16 at 6:29 pm to Duke
Maybe a weather expert can explain something to me. I used to live in Memphis, and we had a lot of tornado outbreaks almost every time a storm front moved through. I got pretty good at pointing out rotation on the radar and certainly hook echos...but that's the extent of what I know about severe weather. What I don't understand is the difference between the conditions that create a bow echo or "derecho" such as what Baton Rouge saw in April of last year and the conditions that caused the pretty significant (for Louisiana) outbreak yesterday.
I lived in Louisiana for 24 years, and I've seen tornadoes, microbursts, several hurricanes....but I never remember seeing longer track tornadoes similar to what we saw yesterday. I rarely even hear about those types of tornado outbreaks south of I-20. I imagine those conditions that contributed to those tornadoes yesterday were pretty unique.
On the other hand, I was told the April 2015 storm that impacted the Baton Rouge area was the worst that a lot of people saw since Hurricane Gustav. I saw the video posted of this storm earlier in the thread, and it look pretty insane. I wasn't in town for that, but I remember watching it on CNN in the Minneapolis airport. It seemed similar to how people in Memphis describe "hurricane elvis" from 2003.LINK
So what is the big differences in the contributing factors to what happened yesterday and those large derechos?
I lived in Louisiana for 24 years, and I've seen tornadoes, microbursts, several hurricanes....but I never remember seeing longer track tornadoes similar to what we saw yesterday. I rarely even hear about those types of tornado outbreaks south of I-20. I imagine those conditions that contributed to those tornadoes yesterday were pretty unique.
On the other hand, I was told the April 2015 storm that impacted the Baton Rouge area was the worst that a lot of people saw since Hurricane Gustav. I saw the video posted of this storm earlier in the thread, and it look pretty insane. I wasn't in town for that, but I remember watching it on CNN in the Minneapolis airport. It seemed similar to how people in Memphis describe "hurricane elvis" from 2003.LINK
So what is the big differences in the contributing factors to what happened yesterday and those large derechos?
This post was edited on 2/24/16 at 6:31 pm
Posted on 2/25/16 at 1:45 am to dewster
I'm a little out of my depth, but I'll give it a shot anyway. It's the internet, so I can be an expert even if I'm not.
A deracho is basically a very powerful bow echo type situation. They're noted for their long path and near or above hurricane force winds. It's all from one direction and the upper levels are all working in the same direction too. You ever notice the cold wind that comes through right before a thunderstorm? That's from the rain cooled air rushing down to the ground and out. Thus forces the warm air in front to rise up. The deracho just had a really strong downdraft and causes a really big lift in front.
Deep lows and the trailing cold front line can have the characteristics of a deracho. The strong winds from behind cause the same effect. A good example is the "Storm of the Century" in 93. Florida and even Cuba saw 100 mph winds from the deracho line.
Summary: Wind is one directional, presentation is mostly linear, and near or above hurricane force winds.
Yesterday's outbreak was driven by strong winds changing direction and speed with height as the low over North La developed. That rotates the updraft of warm air and drives it up at a bit of an angle, so it dumps the cold air to its north as heavy rain/hail. This keeps the warm fuel flowing in and doesn't choke the storm out like your normal thunderstorms. You get a very localized low pressure where the updraft is, and thus tornados.
Do remember, I'm not a professional or have any special expertise on the subject.
A deracho is basically a very powerful bow echo type situation. They're noted for their long path and near or above hurricane force winds. It's all from one direction and the upper levels are all working in the same direction too. You ever notice the cold wind that comes through right before a thunderstorm? That's from the rain cooled air rushing down to the ground and out. Thus forces the warm air in front to rise up. The deracho just had a really strong downdraft and causes a really big lift in front.
Deep lows and the trailing cold front line can have the characteristics of a deracho. The strong winds from behind cause the same effect. A good example is the "Storm of the Century" in 93. Florida and even Cuba saw 100 mph winds from the deracho line.
Summary: Wind is one directional, presentation is mostly linear, and near or above hurricane force winds.
Yesterday's outbreak was driven by strong winds changing direction and speed with height as the low over North La developed. That rotates the updraft of warm air and drives it up at a bit of an angle, so it dumps the cold air to its north as heavy rain/hail. This keeps the warm fuel flowing in and doesn't choke the storm out like your normal thunderstorms. You get a very localized low pressure where the updraft is, and thus tornados.
Do remember, I'm not a professional or have any special expertise on the subject.
Posted on 2/25/16 at 2:10 am to dewster
The outbreak of tornadoes yesterday is being compared to the June 1989 outbreak in BR. A tornado tore through that trailer park off of Pecue and then moved through Shenandoah. It was starting to recede once it got to Shenandoah and passed over my backyard a couple of hundred feet in the air. You can still see the hole in the trees the tornado cut and knocked down from the ones still standing at the end of the street.
This post was edited on 2/25/16 at 2:14 am
Posted on 2/25/16 at 2:11 am to dewster
The storm that rolled through in April 2015 was some of the worst non hurricane weather to ever hit Baton Rouge. For those 10 minutes it impacted an area it rivaled the intensity of Gustav, Andrew, or Betsy.
Posted on 2/25/16 at 1:39 pm to The Boat
Best thing about the nados is the MREs.
Yummy!
Yummy!
Posted on 2/25/16 at 2:03 pm to Duke
That's a fantastic way to describe a derecho. 
You see a lot of that in West to Central Texas in the springtime when the jet stream presents a certain way... Some are massive. Decent chance of those spinning off a real tornado off the southern tip.
You see a lot of that in West to Central Texas in the springtime when the jet stream presents a certain way... Some are massive. Decent chance of those spinning off a real tornado off the southern tip.
Posted on 2/25/16 at 2:05 pm to tigerbandpiccolo
Lemon poppyseed muffins are the titties 
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