Enhanced Fujita Scale upgrade

I've seen low pressure from a "weak" tornado pull insulation out of a mobile home all around the roof.
 
The video and pictures I can pull up online aren't very impressive for an f-3. I was looking the the pictures that the NWS posted.

I live in BGM's CWA and am familiar with the 1998 tornado; while it was relatively weak over much of its path (and possibly not one continuous tornado at all), it did extensive damage (consistent with F3) to the home you're referring to in Deposit. I also remember seeing pretty significant tree damage near Rt. 8 and the Cannonsville Reservoir. My dad took me to see it several times since we only lived ~10 miles from there. The fact that the worst damage only occurred in a few isolated areas doesn't mean anything as far as the maximum rating is concerned.

As for the last part, everything you described sounds pretty well in line with what you'd expect from an EF1 rating depending on the construction quality of the home(s) in question.
 
I don't know about insulation, but I do know tornadoes. So I get this one near Daleton, right? And I am way too close. I've got the vid on it right, I'm filming it. And all of the sudden outta nowhere, this sh**ty lookin' green Valiant comes pulling up right in the way. And this loser stumbles out of the car, he's got like a bottle of Jack Daniel's in his hand... And he just strolls up to the twister, says 'have a drink', and he chucks the bottle into the twister, and it NEVER hits the ground.

The twister caught it, and sucked it right up!
 
No, no. That's a myth. Low pressure doesn't 'suck' insulation out. Winds blow it out.

Sigh. Really?

The atmosphere doesn't care which direction the wind is blowing. Wind is generated by the pressure gradient force, so air moves towards low pressure or away from high pressure. You may think that means there is a semantic difference between "suck" and "blow" (insert Spaceballs reference here), but I'm pretty sure as far as the atmosphere is concerned it doesn't matter.
 
Exactly. The pressure difference didn't "suck" out the insulation. The wind does that...

Now if you want to semantics chicken-n-egg I suppose we could :) but I don't think that's the direction calvin was heading ;)
 
Off topic, but the egg came first. It's parents weren't exactly chickens, but evolution made those two almost chickens and created the first actual chicken. Now back to your regular programming...
 
That exactly are the forces that a tornado creates due to the low pressure, because there is outward pressure when a tornado passes overhead and one is in a building.
 
Now if you want to semantics chicken-n-egg I suppose we could
It wouldn't be StormTrack if a conversation didn't rely heavily on semantics.

Moot point anyways, because if you open the windows before a tornado hits, the pressure difference is equalized, and your insulation stays where it is. Bonus points if your house is built under a freeway overpass.
 
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