rolltide_130 Posted June 29, 2017 Share Posted June 29, 2017 1 minute ago, NWLinnCountyIA said: Really garbage video What video are you watching? It looks good to me Link to comment Share on other sites More sharing options...
hlcater Posted June 29, 2017 Share Posted June 29, 2017 1 minute ago, rolltide_130 said: My own lol Link to comment Share on other sites More sharing options...
iowahawkeyedave Posted June 29, 2017 Share Posted June 29, 2017 2 minutes ago, NWLinnCountyIA said: Really garbage video Pretty classic Iowa tornado, corn in the foreground, with the tornado in the background. Video quality is good too. Link to comment Share on other sites More sharing options...
Indystorm Posted June 29, 2017 Share Posted June 29, 2017 24 prelim tor reports today. Certainly did not expect that. Link to comment Share on other sites More sharing options...
HillsdaleMIWeather Posted June 29, 2017 Share Posted June 29, 2017 Line quickly dropped below severe limits, but is producing lots of heavy rain Link to comment Share on other sites More sharing options...
Chicago Storm Posted June 29, 2017 Share Posted June 29, 2017 Was on the tor warned couplet near Belvidere, IL a short time ago. There was a wall cloud for a brief time, but the nice shelf cloud was the bigger story. Link to comment Share on other sites More sharing options...
Buckeye05 Posted June 29, 2017 Share Posted June 29, 2017 1 hour ago, andyhb said: Pretty violent looking tornado from near Bedford, IA. Honestly, the motion starting at 0:13 is some of the most impressive I've ever seen. Looks like its being fast-forwarded. Certainly a violent tornado, but I haven't heard any reports of major damage in Taylor County. Must have avoided structured for the most part. Link to comment Share on other sites More sharing options...
Hoosier Posted June 29, 2017 Share Posted June 29, 2017 5"+ of rain around Rockford. Rain has moved out, at least for now. Link to comment Share on other sites More sharing options...
Quincy Posted June 29, 2017 Share Posted June 29, 2017 3 hours ago, andyhb said: Today another great example of how shear trumps instability. Relatively modest instability for the time of year, but with more southerly surface winds than projected, large low level hodographs and favorable storm relative wind profiles, it yields a regional tornado outbreak especially for Iowa. Favorable storm mode lasting for longer than expected as well, largely because of the aforementioned wind profiles. A lot of things came together really, including low LCLs and rich boundary layer moisture (lower 70s dews pooled in southwestern Iowa) which helped allow the tornado threat to get going rather early in storm development. Whenever you have low LCLs and substantial low level shear, it won't take much for storms to rotate and become tornadic. Just noting climo, the mean MLCAPE for tornado events in southern Iowa is generally in the 1500-2000 J/kg range and tonight was at or above that range. Going back to LCLs, I didn't see any conclusive tornadoes, but saw plenty of very low wall clouds and funnels, even with cells that looked junky on radar. Rolling hills blocked my view of Arbor Hill, but the wall cloud could have easily been mistaken for a large wedge. The cloud base had to have been AOB 500m, but by the time I got there, the funnel was lifting. Another consideration is that storms fired along an apparent residual outflow boundary, ahead of the cold front. That alone was a key difference between a brief supercell tornado threat and a more widespread, longer-lived tornado event, like we saw. From a chasing standpoint, it was certainly not easy. A lone cell fired north of DSM by mid-afternoon and that decoyed some chasers north. Those who jumped on the early southern echo near Nebraska City probably had the catch of the day. I was slow to bite and if it wasn't for hills blocking view, I'd probably have had better footage of the tornadic storms up near I-80. Link to comment Share on other sites More sharing options...
Chinook Posted June 29, 2017 Share Posted June 29, 2017 Storm survey crews around Pleasantville, IA may find some pretty strong damage. This GRLevel3 image shows 130 kt delta V here at 23:16z Link to comment Share on other sites More sharing options...
AppsRunner Posted June 29, 2017 Share Posted June 29, 2017 Stuart, IA tornado with a preliminary rating of EF-0 with 75mph winds. More surveys coming tomorrow. Link to comment Share on other sites More sharing options...
Quincy Posted June 29, 2017 Share Posted June 29, 2017 Just quick driving through the edge of Pleasantville, I saw trees sawed in half like toothpicks and that was apparently just on the northern fringe of the damage path. Link to comment Share on other sites More sharing options...
BuffaloWeather Posted June 29, 2017 Share Posted June 29, 2017 Incredible video/pics. Definitely a surprise outbreak. Link to comment Share on other sites More sharing options...
Powerball Posted June 29, 2017 Share Posted June 29, 2017 3 hours ago, andyhb said: Today another great example of how shear trumps instability. Relatively modest instability for the time of year, but with more southerly surface winds than projected, large low level hodographs and favorable storm relative wind profiles, it yields a regional tornado outbreak especially for Iowa. Favorable storm mode lasting for longer than expected as well, largely because of the aforementioned wind profiles. Was CAPE values of 2000 J/KG and mid-level lapse rates of 7 C/KM really all that modest? I mean, the numbers weren't earth-shattering, but definitely more than enough to trigger and sustain decent activity. In fact, when doing a comparison to the data from DVN's historical soundings, the level of instability today was slightly above average for this time of year. EDIT: Never mind, I see Quincy beat me to it. Link to comment Share on other sites More sharing options...
andyhb Posted June 29, 2017 Share Posted June 29, 2017 1 hour ago, Powerball said: Was CAPE values of 2000 J/KG and mid-level lapse rates of 7 C/KM really all that modest? I mean, the numbers weren't earth-shattering, but definitely more than enough to trigger and sustain decent activity. In fact, when doing a comparison to the data from DVN's historical soundings, the level of instability today was slightly above average for this time of year. EDIT: Never mind, I see Quincy beat me to it. For the time of year. Link to comment Share on other sites More sharing options...
Stebo Posted June 29, 2017 Share Posted June 29, 2017 2000 J/kg SBCAPE at this time of year isn't earth shattering, especially when we can get to 3000+ very easily on most hot and humid days in Iowa. Link to comment Share on other sites More sharing options...
Hoosier Posted June 29, 2017 Share Posted June 29, 2017 14 minutes ago, Stebo said: 2000 J/kg SBCAPE at this time of year isn't earth shattering, especially when we can get to 3000+ very easily on most hot and humid days in Iowa. Yeah, and we are getting into the time of year where you can have those crazy 5000-7000+ days, although usually lacking good low level shear. The environment today was well suited for tornadoes. But only focusing on CAPE, I agree that it was not that impressive by late June standards. Link to comment Share on other sites More sharing options...
cyclone77 Posted June 29, 2017 Share Posted June 29, 2017 Radar is now estimating rainfall of a foot over parts of northwest Missouri. Storms are continuing to redevelop in that area as well. Link to comment Share on other sites More sharing options...
HillsdaleMIWeather Posted June 29, 2017 Share Posted June 29, 2017 If the 0Z suite is correct, Friday went from looking really interesting locally to a nothingburger Link to comment Share on other sites More sharing options...
andyhb Posted June 29, 2017 Share Posted June 29, 2017 Another view of the Bedford tornado, lucky this monster didn't come across a town. Link to comment Share on other sites More sharing options...
Indystorm Posted June 29, 2017 Share Posted June 29, 2017 Cells starting to pop in ne IL with svr warned storms rapidly forming in southern Iroquois county. Bulk shear of 45 knots and fairly good low level lapse rates but mid levels are poor. Link to comment Share on other sites More sharing options...
Hoosier Posted June 30, 2017 Share Posted June 30, 2017 Public Information Statement National Weather Service Chicago IL 421 PM CDT Thu Jun 29 2017 /521 PM EDT Thu Jun 29 2017/ ...NWS DAMAGE SURVEY FOR 06/28/2017 TORNADO EVENT... .Cherry Valley to Belvidere Tornado... Rating: EF-1 Estimated peak wind: 100 mph Path length /Statute/: 6.0 miles Path width /Maximum/: 200 yards Fatalities: 0 Injuries: 0 Start date: Jun 28 2017 Start time: 8:14 PM CDT Start location: 2 miles SSE of Cherry Valley Start Lat/Lon: 42.211/-88.948 End date: Jun 28 2017 End time: 8:22 PM CDT End location: 4 miles S of Belvidere End_lat/lon: 42.197/-88.835 .Belvidere Tornado... Rating: EF-1 Estimated peak wind: 100 mph Path length /Statute/: 1.6 miles Path width /Maximum/: 100 yards Fatalities: 0 Injuries: 0 Start date: Jun 28 2017 Start time: 8:23 PM CDT Start location: 4 miles SSE of Belvidere Start Lat/Lon: 42.208/-88.810 End date: Jun 28 2017 End time: 8:25 PM CDT End location: 5 miles SE of Belvidere End_lat/lon: 42.208/-88.778 EF Scale: The Enhanced Fujita Scale Classifies Tornadoes into the following categories. EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 To 200 mph EF5...Violent...>200 mph NOTE: The information in this statement is PRELIMINARY and subject to change pending final review of the event and publication in NWS Storm Data. $$ - Izzi Link to comment Share on other sites More sharing options...
AppsRunner Posted June 30, 2017 Share Posted June 30, 2017 1 EF-0 and 4 EF-1's so far for DMX. I believe there's one more left to investigate in their CWA. One EF-2 in DVN's area too. Here's DMX's summary with some radar/pictures as well: http://www.weather.gov/dmx/20170628summary Link to comment Share on other sites More sharing options...
HillsdaleMIWeather Posted June 30, 2017 Share Posted June 30, 2017 Day 1 Marginal trimmed way down. Link to comment Share on other sites More sharing options...
HillsdaleMIWeather Posted June 30, 2017 Share Posted June 30, 2017 Good news is the 18Z 3K NAM is looking much more interesting tomorrow Link to comment Share on other sites More sharing options...
Jim Martin Posted June 30, 2017 Share Posted June 30, 2017 No shortage of moisture for tomorrow... Link to comment Share on other sites More sharing options...
Stebo Posted June 30, 2017 Share Posted June 30, 2017 1 hour ago, HillsdaleMIWeather said: Good news is the 18Z 3K NAM is looking much more interesting tomorrow Don't worry the 00z took care of that. Link to comment Share on other sites More sharing options...
Jim Martin Posted June 30, 2017 Share Posted June 30, 2017 3 minutes ago, Stebo said: Don't worry the 00z took care of that. Link to comment Share on other sites More sharing options...
Stebo Posted June 30, 2017 Share Posted June 30, 2017 2 minutes ago, Jim Martin said: Should have quantified that, as interesting for MI. Link to comment Share on other sites More sharing options...
HillsdaleMIWeather Posted June 30, 2017 Share Posted June 30, 2017 9 minutes ago, Stebo said: Should have quantified that, as interesting for MI. It's been shoving the MCS around run to run, so I'm not losing hope yet. Link to comment Share on other sites More sharing options...
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