I won't be able to go to the 24th Conference on Severe Local Storms in Savannah, Georgia later this month. But I have submitted a paper for the online preprint, titled "Three Strong Tornadoes in 2008 associated with Boundary Intersections and Narrow Instability Axes near 700-mb Lows". The final version is now online HERE.
The paper focuses on 3 strong tornado events (see photos above) that were difficult to forecast in 2008:
- May 1 in northwest Iowa (F2 tornado near Rock Valley)
- May 22 in Colorado (the F3 Windsor tornado, with 1 death)
- June 6 in north-central Minnesota (F2 and F3 tornadoes near Park Rapids)
These had some features and ingredients that were similar to so-called "cold-core" events, but probably wouldn't be considered as such using a rigid definition. While the paper is not anything "earth-shattering", I hope some people find the case studies useful.
- Jon Davies (updated 10/22/08)
Thanks for putting this up. I was very interested in the writeup on Windsor. While everyone seemed to be in Kansas already chasing, I was at work at a local flash flood prediction program. What an amazing day to sit and watch the level3 high-res. I'm still kicking myself for not saving any of the imagery.
Good stuff here. Always love a good case study. Just thought I would drop a note about the May 1st storms. In one of your radar grabs you have the storm southwest of Sioux Falls labelled as non-tornadic. I was chasing that storm and I had reported a brief tornado with this storm that was included in their warning text, however it never ended up in LSR's or storm reports. Not that it really affects any of the research here, but just thought it would be interesting to note. Thanks again for putting these together!
Thanks, Dann for the comments about the Windsor tornado write-up... a very unusual and difficult-to-forecast event for Colorado.
Beau, I didn't know that the southeast SD cell on 1 May '08 produced a brief tornado. That cell appeared to be over consistently cooler surface air than the northwest Iowa cells near the boundary intersection, which probably limited it's tornado production. Thanks for the info!
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