nwohweather Posted May 21, 2024 Share Posted May 21, 2024 Absolute monster on the radar. One of the strongest signatures I've ever seen within a line Link to comment Share on other sites More sharing options...
canderson Posted May 21, 2024 Share Posted May 21, 2024 Reed Timmer just got this video. It shredded a windmill. I recorded off my phone but don’t know where to upload since it’s too big for the board upload system . Those vortexes! Link to comment Share on other sites More sharing options...
WxWatcher007 Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 8:33 PM, canderson said: Reed Timmer just got this video. It shredded a windmill. I recorded off my phone but don’t know where to upload since it’s too big for the board upload system . Those vortexes! Expand 4 Link to comment Share on other sites More sharing options...
andyhb Posted May 21, 2024 Share Posted May 21, 2024 Catastrophic damage in Greenfield IA. TDS went up over 40,000 feet. Link to comment Share on other sites More sharing options...
zinski1990 Posted May 21, 2024 Share Posted May 21, 2024 Greenfield probably got wiped off the map 1 Link to comment Share on other sites More sharing options...
StormySquares Posted May 21, 2024 Share Posted May 21, 2024 Forgive me if I'm wrong, but didn't it look like the velocity signature weakened some as it went into Greenfield? Link to comment Share on other sites More sharing options...
bowtie` Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 1:31 PM, sbnwx85 said: Storms yesterday did some impressive damage in Laporte County. https://x.com/nwsiwx/status/1792727617529135390?s=46 Expand Electrical transmission looks horrible, but the wheat looks great! 1 Link to comment Share on other sites More sharing options...
Powerball Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 8:58 PM, StormySquares said: Forgive me if I'm wrong, but didn't it look like the velocity signature weakened some as it went into Greenfield? Expand Even if it did, it was still likely too little too late to spare Greenfield from extensive damage. Link to comment Share on other sites More sharing options...
andyhb Posted May 21, 2024 Share Posted May 21, 2024 1 6 Link to comment Share on other sites More sharing options...
bowtie` Posted May 21, 2024 Share Posted May 21, 2024 Always scary to watch the atmosphere un-zip, like it did from Missouri to Kansas and Oklahoma. Link to comment Share on other sites More sharing options...
StormySquares Posted May 21, 2024 Share Posted May 21, 2024 I found the location of the photo Andy posted. 41°18'14.9"N 94°27'11.7"W 1 Link to comment Share on other sites More sharing options...
Chinook Posted May 21, 2024 Share Posted May 21, 2024 this was a tornado that may have been brief (might mentioned as Greenbush, a small town) Link to comment Share on other sites More sharing options...
Chinook Posted May 21, 2024 Share Posted May 21, 2024 new tornado by Cambridge, north of Des Moines. (radar might have seen the initial circulation right next to the radar a few minutes ago) Link to comment Share on other sites More sharing options...
mob1 Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 9:51 PM, Chinook said: new tornado by Cambridge, north of Des Moines. (radar might have seen the initial circulation right next to the radar a few minutes ago) Expand PDS warning on that one but it's hard to tell given its proximity to the radar site. Link to comment Share on other sites More sharing options...
Chinook Posted May 21, 2024 Share Posted May 21, 2024 tornado tracked about 17-18 miles in 12 minutes Link to comment Share on other sites More sharing options...
Chinook Posted May 21, 2024 Share Posted May 21, 2024 It was pretty close to the radar, and I think I found that the base velocity was 140mph on the south side of the tornado, maybe the max base velocity that can be measured? Link to comment Share on other sites More sharing options...
mob1 Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 10:08 PM, Chinook said: It was pretty close to the radar, and I think I found that the base velocity was 140mph on the south side of the tornado, maybe the max base velocity that can be measured? Expand https://x.com/crickbritt/status/1793039817858588974 Was definitely a big one Link to comment Share on other sites More sharing options...
thunderbird12 Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 10:08 PM, Chinook said: It was pretty close to the radar, and I think I found that the base velocity was 140mph on the south side of the tornado, maybe the max base velocity that can be measured? Expand Looking back, my GR2 had a couple base-velocity pixels of 160 kt (184 mph) at around 700 feet above ground when the tornado was south of Cambridge, IA. Even discounting that, there were several scans where it had 120-140 kt base velocity at multiple tilts, which is impressive. Looks like that particular tornado has finally weakened, thankfully. 1 Link to comment Share on other sites More sharing options...
mob1 Posted May 21, 2024 Share Posted May 21, 2024 https://x.com/Tornado_Steejo/status/1793040922319495301 This is the tornado that went on to hit Greenfield. Link to comment Share on other sites More sharing options...
KoalaBeer Posted May 21, 2024 Share Posted May 21, 2024 Greenfield drone footage. No matter how many times I see it, it never ceases to amaze me how one home can be slabbed and houses a block away are relatively unscathed. Really high end damage, will have to see what the survey crews find. 3 Link to comment Share on other sites More sharing options...
Brian D Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 10:24 PM, KoalaBeer said: Greenfield drone footage. No matter how many times I see it, it never ceases to amaze me how one home can be slabbed and houses a block away are relatively unscathed. Really high end damage, will have to see what the survey crews find. Expand That looks like EF3 to 4 damage along the path. Brutal. Hope everyone made shelter. Link to comment Share on other sites More sharing options...
Chinook Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 10:18 PM, thunderbird12 said: Looking back, my GR2 had a couple base-velocity pixels of 160 kt (184 mph) at around 700 feet above ground when the tornado was south of Cambridge, IA. Even discounting that, there were several scans where it had 120-140 kt base velocity at multiple tilts, which is impressive. Looks like that particular tornado has finally weakened, thankfully. Expand maybe my system couldn't display a number over 141mph Link to comment Share on other sites More sharing options...
KoalaBeer Posted May 21, 2024 Share Posted May 21, 2024 On 5/21/2024 at 10:39 PM, Brian D said: That looks like EF3 to 4 damage along the path. Brutal. Hope everyone made shelter. Expand Ya I don’t necessarily like tossing out numbers based of photos etc, but I’d bet my left nut this will be rated EF4+ Saw a few photos of asphalt ripped from the road as well. Link to comment Share on other sites More sharing options...
WxSynopsisDavid Posted May 22, 2024 Share Posted May 22, 2024 Greenfield, IA tornado will be “at least EF4”. Pretty significant damage indicators being found. Of significant, the asphalt scouring and how the debris looks granulated. Typically these are trademarks of upper echelon high end tornadoes, along with debris lofting 40k feet into the atmosphere. I would venture to say preliminary rated 190mph or 200mph until engineers get on site to conduct their analysis. Engineers such as Tim Marshall. Link to comment Share on other sites More sharing options...
Chicago Storm Posted May 22, 2024 Share Posted May 22, 2024 On 5/22/2024 at 12:20 AM, WxSynopsisDavid said: Engineers such as Tim Marshall. Expand may very well only be an EF-2 in that case. 1 2 Link to comment Share on other sites More sharing options...
WxSynopsisDavid Posted May 22, 2024 Share Posted May 22, 2024 On 5/22/2024 at 12:23 AM, Chicago Storm said: may very well only be an EF-2 in that case. Expand Numerous slabs wiped clean have bent anchor bolts. Tim has rated past tornadoes EF5 (ex: the 2011 EF5’s) off of this sole indicator. That and/or missing anchor bolts, but there’s no reports of any missing anchor bolts, as of yet. Link to comment Share on other sites More sharing options...
zinski1990 Posted May 22, 2024 Share Posted May 22, 2024 On 5/22/2024 at 12:23 AM, Chicago Storm said: may very well only be an EF-2 in that case. Expand we all know this will be ef2 cause nws refuses to ever rate an ef5 ever agin Link to comment Share on other sites More sharing options...
Chinook Posted May 22, 2024 Share Posted May 22, 2024 confirmed tornado near Davenport Quote The National Weather Service in the Quad Cities has issued a * Tornado Warning for... Southeastern Cedar County in east central Iowa... Northwestern Scott County in east central Iowa... North central Muscatine County in east central Iowa... * Until 800 PM CDT. * At 738 PM CDT, a confirmed large and extremely dangerous tornado was located near Atalissa, or 8 miles north of Muscatine, moving northeast at 65 mph. This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW! HAZARD...Damaging tornado. SOURCE...Weather spotters confirmed tornado. Expand Link to comment Share on other sites More sharing options...
shaggy Posted May 22, 2024 Share Posted May 22, 2024 DOW recorded winds over 200mph with the greenfield tornado Link to comment Share on other sites More sharing options...
WxSynopsisDavid Posted May 22, 2024 Share Posted May 22, 2024 On 5/22/2024 at 12:41 AM, shaggy said: DOW recorded winds over 200mph with the greenfield tornado Expand Reading was 215mph and 600ft off the surface. So plausible to say 190-200mph. 1 Link to comment Share on other sites More sharing options...
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