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Severe Weather Threat 5/19-5/22/2024

Maxis_s said:
View attachment 28556
That was snapped/ripped off of the nail with the nail slightly bent, same for another one. I don't know how strong windspeeds need to be for that to happen but that is pretty crazy.
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Those are usually secured with 1/2" rebar about a foot long. It's a softish steel where the hammered end tends to spread but doesn't always lock in. Typical weight is 250lbs+ I recall some EF-5 surveys where these were lifted and thrown tens of feet, but the ones in the pic may have already been cracked/ weakened at the stub by parking impacts based on the ones remaining in place and in seeing that kind of damage IRL. I've set maybe 20 of these in my younger days (with a helper of course!)
 
Sawmaster said:
Those are usually secured with 1/2" rebar about a foot long. It's a softish steel where the hammered end tends to spread but doesn't always lock in. Typical weight is 250lbs+ I recall some EF-5 surveys where these were lifted and thrown tens of feet, but the ones in the pic may have already been cracked/ weakened at the stub by parking impacts based on the ones remaining in place and in seeing that kind of damage IRL. I've set maybe 20 of these in my younger days (with a helper of course!)
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Yeah, the most high-profile instance of this was Joplin, and what was interesting there is the way the parking stops failed. In most cases they seem to have been twisted off counterclockwise with the rebar spikes flattened almost to the ground, and in other cases the spikes themselves were sheared off. Really interesting.
 
Sawmaster said:
Those are usually secured with 1/2" rebar about a foot long. It's a softish steel where the hammered end tends to spread but doesn't always lock in. Typical weight is 250lbs+ I recall some EF-5 surveys where these were lifted and thrown tens of feet, but the ones in the pic may have already been cracked/ weakened at the stub by parking impacts based on the ones remaining in place and in seeing that kind of damage IRL. I've set maybe 20 of these in my younger days (with a helper of course!)
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The place of these parking stops. Noted that it's outside of the worst damage swath and vehicles nearby not moved
IMG_20240608_105222.jpg
 
pohnpei said:
The place of these parking stops. Noted that it's outside of the worst damage swath and vehicles nearby not moved
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Not surprised to see this as, well obviously the vehicles are a lot heavier than those parking stops.

And of course those things definitely lost some structural integrity since they were installed, most certainly no where near as impressive as the Joplin tornado case.
 
jiharris0220 said:
Not surprised to see this as, well obviously the vehicles are a lot heavier than those parking stops.

And of course those things definitely lost some structural integrity since they were installed, most certainly no where near as impressive as the Joplin tornado case.
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Even with the car's heavier weight, they are only held in place by friction. The flow of wind under them can reduce their apparent weight, and in most cases only one wheel is locked against rotation. Moving cars is not a big deal- lofting them is. An undamaged parking curb will be more resistant to lateral movement being doubly staked in place with wind not getting under them, and much harder to loft as their weight-to-surface area is much higher than a car.

It's said that in typhoons, flying coconuts are like cannonballs. Getting hit end-on by a flying parking curb in a tornado would be more like an artillery shell's impact.
 
Sawmaster said:
Even with the car's heavier weight, they are only held in place by friction. The flow of wind under them can reduce their apparent weight, and in most cases only one wheel is locked against rotation. Moving cars is not a big deal- lofting them is. An undamaged parking curb will be more resistant to lateral movement being doubly staked in place with wind not getting under them, and much harder to loft as their weight-to-surface area is much higher than a car.

It's said that in typhoons, flying coconuts are like cannonballs. Getting hit end-on by a flying parking curb in a tornado would be more like an artillery shell's impact.
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I know, which says a lot about the parking stops in this particular case because they’re the ones that got dislodged while the only vehicle that even got moved a little was the grey pickup.
 
Tennie said:
The NSSL has put out an article about the experimental use of the Warn-on-Forecast System (WoFS) during the Iowa tornado outbreak, and how it managed to achieve lead times of as much as 75 minutes:

SCIENCE IMPACT: Experimental Warn-on-Forecast System yields 75-minute lead time on violent tornado – NSSL News

inside.nssl.noaa.gov inside.nssl.noaa.gov
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I wonder what the article means where it says "machine hearing"? Would that be the computer listening to the discussions going on, or is it some meteorological aspect it's listening to? Anyway bulls-eyeing the tornado sans guessing at 75 minutes out is impressive :D
 
A 185mph Di has been added to the greenfield dat survey. Making it the strongest rated tornado of the year…however I am confused…as the Di is for a slabbed home that doesn’t appear to have much in the way of…anchoring. So…

I guess we’ll have to wait in see what the reasoning for that is.
 
tornado examiner said:
A 185mph Di has been added to the greenfield dat survey. Making it the strongest rated tornado of the year…however I am confused…as the Di is for a slabbed home that doesn’t appear to have much in the way of…anchoring. So…

I guess we’ll have to wait in see what the reasoning for that is.
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1719346541342.png
Ripped up floorboards all over and the sink/toilet completely ripped out I assume.
 
1722770513012.png1722770612845.png

Have taken these two screenshots from this video linked below, which contains some very impressive footage of the actual Greenfield tornado - so would highly recommend a watch:



However, I thought I would share these images here too, since not only is that pretty intense vehicle damage, but I am also curious to hear other's opinions on if this might be significant scouring? Haven't seen much scouring evidence from the Greenfield tornado so far, so would be interested to hear people's thoughts.
 
UK_EF4 said:
View attachment 29549View attachment 29550

Have taken these two screenshots from this video linked below, which contains some very impressive footage of the actual Greenfield tornado - so would highly recommend a watch:



However, I thought I would share these images here too, since not only is that pretty intense vehicle damage, but I am also curious to hear other's opinions on if this might be significant scouring? Haven't seen much scouring evidence from the Greenfield tornado so far, so would be interested to hear people's thoughts.
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Incredible Phenomena Will Occur!
 
UK_EF4 said:
View attachment 29549View attachment 29550

Have taken these two screenshots from this video linked below, which contains some very impressive footage of the actual Greenfield tornado - so would highly recommend a watch:



However, I thought I would share these images here too, since not only is that pretty intense vehicle damage, but I am also curious to hear other's opinions on if this might be significant scouring? Haven't seen much scouring evidence from the Greenfield tornado so far, so would be interested to hear people's thoughts.
Click to expand...

That is probably the most erratic ground scouring I have ever seen from a multi vortex tornado.
 
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