Nebraska Storm Chase June 19 and 20, 2011
A strong (EF3) tornado passes just northwest of Stromsburg, Nebraska on June 20, 2011.
A significant severe weather event, including several tornadoes, affected a large part of the central plains on June 19th. A larger area of the central/southern plains and midwest was hit with severe storms and tornadoes on the 20th. The events were seen several days in advance as a strong storm system; deep surface low pressure and high instability were all forecast to be in place over the two day period. For storm chasers on vacation this was a must-chase situation.
The "Graphicast" I used on my blog the day before explained the potential and the results lived up to the billing:
Saturday, June 18 - My chase partner, Doug Speheger, and I left Okarche just after 6 P.M. planning on using the evening as a travel/positioning day. Our plan was to reach Wakeeney, Kansas with the potential of seeing a couple of storms and some lightning on the way. This worked pretty well and we watched some storms at a distance that were along the Kansas/Oklahoma border. We ended up seeing a little bit of lightning near Dodge City and Jetmore, Kansas. The lightning could have been better but this was mainly a travel day and anything at all was a bonus. We got to the hotel a little after 12:30 A.M. Gallery of a few selected images from the evening. Sunday, June 19 - We left the hotel and headed toward Goodland with a couple of targets in mind. We were confident that storms would form in northeast Colorado and move toward southwest Nebraska but also fairly confident that storms would form along the warm front somewhere near the Kansas/Nebraska border. The trouble was, while it was clear where storms would form in Colorado, it was virtually a guess where storms might form on a 350 mile section of the warm front. We tried to position to keep both areas in play and by mid-afternoon were hanging around the Colorado/Nebraska border around Haigler, Nebraska and Wray, Colorado. There were several times when we were quite tempted to make a run toward storms that organized early in the afternoon near the Colorado/Wyoming border. Other storms forming near Denver also had us just about to jump, but various reasons kept us hanging in our spot around Wray monitoring building cumulus clouds near the extreme northwest corner of Kansas. Finally, enough pulsing led to storm development just north of the warm front not too far to our east. Radar showed a steady upswing and we started the move eastward with target storms east of Haigler.
5:44 P.M. - Stopped just east of Haigler for photo shoot of developing storms (Radar at 5:43 P.M.).
After our shoot near the railroad tracks, we started east again on Highway 34. We made one attempt to go north before running into a bad road. We moved east a little more and used Highway 61 which brought us to a nice viewing position about seven miles north of Benkelman, NE. At this point, we were able to watch a dramatic wall cloud organize and track from our west to our northwest, then northeast. The rotation was incredible and left us wondering, "How in the world did that not produce a tornado?" We watched this evolution for 19 minutes.
Wall cloud development between 6:20 and 6:39 P.M.
Radar at 6:23 P.M. (left) and 6:36 P.M. (right)
Much to our surprise the wall cloud didn't produce a tornado while we were viewing it pass. We started making a move to keep it in sight and drifted a couple of miles east of Highway 61. About five minutes later a tornado developed from a different area of rotation. This tornado started about 6:44 P.M. and only lasted about two minutes.
Radar at 6:45 P.M.
A few minutes after the tornado had weakened we noticed "something rotational", as Doug logged it, which passed from our west to our north. It was small and similar to a gustnado but, if it was, it's the first time I have ever seen one not moving away from a storm. This one was moving toward the circulation which had just produced the tornado. We were under a flanking line of towers which had a lot of motion at cloudbase. We are not sure what to call it, but it was not significant enough to log as a tornado; interesting nonetheless.
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These pages were finalized on July 3.
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