afischer
EF4
A little off topic, but were any chasers on this beast? It's nice to at least see Dustin's photo looking north from ONL.
World record hailstone in South Dakota?
- Thread starter Nick Hartley
- Start date
Tony Laubach
EF5
Kevin Scharfenberg
It looks like the FSD staff was able to confirm the 7 inch stone near Dante: http://kamala.cod.edu/offs/KFSD/0708232036.nous43.html
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Terry Tyler
EF5
penetrating car hoods?
thats insane...what kind of velocity do you suppose a stone of that size would travel?
Willie Dines
EF3
Dave, that is a mighty nasty pair of rocks you got hold of in that photo.
I don't know about the methods of meauring hail, but I would have thought that the stone would be measured at it's widest lines of lattitude and longitude, at leasts how I would be measuring large hail like that.
Willie
Edit - Hail stones penetrating a car hood is definitely insane, thank God nobody was standing in the crash path of one of those boulders.
I don't know about the methods of meauring hail, but I would have thought that the stone would be measured at it's widest lines of lattitude and longitude, at leasts how I would be measuring large hail like that.
Willie
Edit - Hail stones penetrating a car hood is definitely insane, thank God nobody was standing in the crash path of one of those boulders.
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David Drummond
Member
Um, not me in the photo.
Aaron Kennedy
EF5
Pictures of the even larger stones Ortega mentioned are available.
http://www.crh.noaa.gov/fsd/?n=hail2007aug21_dante
http://www.crh.noaa.gov/fsd/?n=hail2007aug21_dante
Josh Richardson
EF4
Well we were on it after passing on the O'Neill storm but a little late. Didnt make it there until around Yankton which is off to the east of Dante. Thanks to road networks had to ride along the southern edge of the core near the river and never encountered anything larger than a few golfball stones at that point. I havent had time to post any pics or report yet but nothing great out of it anyway as we were late and didnt have time to get much in the way of great photos. Would have made to the storm on time had we not went after the O'Neill storm first and then changed our minds. Thats what happens when your running late...
Willie Dines
EF3
I guessed wrong
lol, sorry Dave Just looking at the various images though, that's some nasty lumps of the white stuff being ditched, especially that beastly lump the the elderly lady was holding, on the link that Aaron posted.
Willie
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Marko Korosec
EF4
That is just incredible, I almost can't believe such gigant hail could form!
I didn't find any informations about CAPE from that day, someone has any data? Ayn kind of SPC's SFC mesoanalysis map would be much appreciated! What impresses me the most is how insane vertical speeds were in that storm, that these hail bombs weren't manage to fall on the ground.
Dustin, thanks for the photos, that backsheared anvil is just out of the limits!
I didn't find any informations about CAPE from that day, someone has any data? Ayn kind of SPC's SFC mesoanalysis map would be much appreciated! What impresses me the most is how insane vertical speeds were in that storm, that these hail bombs weren't manage to fall on the ground.Dustin, thanks for the photos, that backsheared anvil is just out of the limits!
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Jayson Prentice
EF5
I did manage to do some looking back on GRAE yesterday, noting that at the storms peak the VIL was 127.5 j/kg and the VILD was a whopping 12.8!! The GRAE algorithm for hail size didn't quite get that size of hail, but was around 4 and a 1/4 for estimated hail size which an average of the hail that fell over Dante would likely come out fairly close to that.
scott r currens
EF3
That is just incredible, I almost can't believe such gigant hail could form!
From memory (grain of salt) the 12z RUC was forecasting 6000-8000 CAPE in SE South Dakota by 0z with 50kt WSW flow at 500mb.
Dustin Wilcox
EF5
Yeah, according to RUC MESOANALYSIS all parameters were poking right south of that storm, CAPE was about 6000j/kg, with a 50kt H5 wave, 130 Craven, Sig Torn of 6, LI of 14, ect... but one thing I found interesting was the fact that the Hail Parameter was relatively not all that high, I think the highest I saw it that day was a 3, when just the day before it reached a 6. Another thing that is a little surprising, while I can't recall the mid-level temperatures, looking back at the Thunderstorm Event Index it seems mid-level temps were about -6 or -7 at H5 and about 13 at H7, I thought I recall seeing something like -11 at H5 according to the RUC Mesoanalysis but I cant certain, those displayed on the Thuderstorm index while pretty good for a summer event still seem a little warm to allow such big hail to make it to the surface..
cdcollura
EF5
Good day all,
This INSANE hail size reminds me of the June 7 day of 2007 in Wisconsin Rapids, WI. Tony Laubach and I tried desperately to get ahead of a tornadic supercell storm moving NE at 70-MPH+ and were glade we didn't! We found grapefruit to coconut sized hail covering the ground, even after some melting!
Above - Huge hail.
The NWS report was initially 4.25", just like with this one in SD. Like one stated, a "standard" and "not jumping to conclusions" measurement / estimate.
Above - Hail craters.
If you visit the link below, you start to see larger sized hail reports that were later confirmed...
http://www.crh.noaa.gov/grb/?n=070607
Most impressive is 5.5" (melon sized?) as an official measurement.
This INSANE hail size reminds me of the June 7 day of 2007 in Wisconsin Rapids, WI. Tony Laubach and I tried desperately to get ahead of a tornadic supercell storm moving NE at 70-MPH+ and were glade we didn't! We found grapefruit to coconut sized hail covering the ground, even after some melting!
Above - Huge hail.
The NWS report was initially 4.25", just like with this one in SD. Like one stated, a "standard" and "not jumping to conclusions" measurement / estimate.
Above - Hail craters.
If you visit the link below, you start to see larger sized hail reports that were later confirmed...
http://www.crh.noaa.gov/grb/?n=070607
Most impressive is 5.5" (melon sized?) as an official measurement.
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