tag:blogger.com,1999:blog-2399626414603781513.post5490550309685395605..comments2023-11-05T00:25:53.153-07:00Comments on Jon Davies Severe Weather Notes: April 9 tornadoes in NW Iowa: Contrasting daytime/nighttime environments?Jon Davieshttp://www.blogger.com/profile/14044746324804312344noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-2399626414603781513.post-73175581078544604832011-04-13T14:34:53.865-07:002011-04-13T14:34:53.865-07:00One more photo to boot... It nice to see this surr...One more photo to boot... It nice to see this surrounding view. I can't see how OAX still is hesitant in calling this a "true" tornado. Anyway, seeing this from a different perspective has put my mind to ease.<br /> http://external.ak.fbcdn.net/safe_image.php?d=6e94e6c776f39ac34f363f48618ab1e1&url=http%3A%2F%2F3.bp.blogspot.com%2F-Fjxb0gF_Zxo%2FTaNawSJvxDI%2FAAAAAAAAA4k%2FxGm8E81fUN4%2Fs400%2FIMG_6980edited.jpgMelky's Used Syringehttps://www.blogger.com/profile/08377512428718921971noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-15473670103785018882011-04-13T14:33:07.403-07:002011-04-13T14:33:07.403-07:00This comment has been removed by the author.Melky's Used Syringehttps://www.blogger.com/profile/08377512428718921971noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-85021770212373773642011-04-13T05:06:07.574-07:002011-04-13T05:06:07.574-07:00Dick:
Thanks for posting the shot with the surfac...Dick:<br /><br />Thanks for posting the shot with the surface dirt plume and cloud structure above. Both the high based RFD and short condensation funnel are visible, suggesting that this was a weak tornado.Jon Davieshttps://www.blogger.com/profile/14044746324804312344noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-58020515179043744772011-04-12T23:12:08.608-07:002011-04-12T23:12:08.608-07:00Jon-Here's a look from the opposite end on you...Jon-Here's a look from the opposite end on your first tornado photo.<br /><br />http://www.flickr.com/photos/stackedplates/5611865106/in/photostream<br /><br />Great write-up as usual!<br /><br />DickDMhttps://www.blogger.com/profile/09880142352896797590noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-20686053464926970352011-04-12T22:59:16.374-07:002011-04-12T22:59:16.374-07:00Excellent write up Jon. It really does a great jo...Excellent write up Jon. It really does a great job of explaining tornado formation on Saturday, and why the event was so extreme, at least in terms of nocturnal storms. It was quite something to watch the lightning-illuminated tornadoes on live stream feed from my friends at Convective Addiction. Thanks.Unknownhttps://www.blogger.com/profile/14782745379671939967noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-21380912340580974782011-04-12T20:59:11.097-07:002011-04-12T20:59:11.097-07:00Jon...always great information contained in your s...Jon...always great information contained in your severe weather analysis, pre and post event. Excellent information for those in the EM field and chasers alike...always a pleasure to read your posts and gain your insight.<br /><br />Corey Sloanmesoextremehttps://www.blogger.com/profile/08777580195855060461noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-60700977156395662542011-04-12T20:57:32.333-07:002011-04-12T20:57:32.333-07:00yeah, I was with MIDSCAR when we called that repor...yeah, I was with MIDSCAR when we called that report in. IMO, regardless of whether it was a legit tornado or not, calling that in and extending the tornado warning saved livesUnknownhttps://www.blogger.com/profile/16313441073904006216noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-6008456360698159902011-04-12T20:50:01.084-07:002011-04-12T20:50:01.084-07:00Absolutely Jon. We had sat in our spot near Whitin...Absolutely Jon. We had sat in our spot near Whiting, IA for 20 minutes watching the storm evolve. We knew a circulation was developing because the wind had shifted from SE to NE and actually blew quarter sized hail storns from NE to SW. At this time we noticed a spiraling (almost cinnamon roll) feature in the relatively high based RFB. We finally noticed the classic occlusion which actually drew in smoke from the fire that was sparked by the train that passed earlier. I am just glad someone else verifies this as a tornado as those who are officially rating it are hesitant to do so. Excellent work as always.Melky's Used Syringehttps://www.blogger.com/profile/08377512428718921971noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-23819232893240958672011-04-12T20:26:46.361-07:002011-04-12T20:26:46.361-07:00Danny:
Regardless of whether one calls the dusty ...Danny:<br /><br />Regardless of whether one calls the dusty but weak Onawa IA vortex a "true tornado", it was definitely associated with cloud features (RFD and cloud rotation) suggestive of a small but rapid mesocyclone evolution (matching radar). This was a definite red flag signal for stronger things to come from the same storm. Those kind of _organized_ features are an important heads up for spotters.Jon Davieshttps://www.blogger.com/profile/14044746324804312344noreply@blogger.comtag:blogger.com,1999:blog-2399626414603781513.post-61829600219724742382011-04-12T20:15:08.284-07:002011-04-12T20:15:08.284-07:00Excellent write up Jon! Glad to see you verify our...Excellent write up Jon! Glad to see you verify our Onawa tornado. Makes me feel a little better. NWS OAX Bryon Miller and I have talked and he seemed intent on saying it was not a "true tornado" I theorized a high based funnel developed and the RFD kicked up all the dust you see blowing to the south of the funnel. I am not sure though. We were 1/2 mile away from it and it didn't look to have much in the way of surface rotation. Cloud base was rotating and the tornado had strong inflow. Mother Nature always finds a way to amaze me!Melky's Used Syringehttps://www.blogger.com/profile/08377512428718921971noreply@blogger.com