Gilman City, MO Tornado Chasing – 6/30/2014
A small group of outflow boundaries mixed with an advancing cold front from the northwest made for a great day in north central Missouri to chase storms. The possibility of tornadoes was fairly high up in Iowa along I80, however, the storms fired a bit early and a resulting derecho formed causing wind damage through parts of Iowa and Illinois.
I chased a discrete storm that formed near Bethany, MO. I made my way out in front of it and positioned myself in the hook. Several wall clouds and some broad rotation were observed but I never could confirm any ground circulation mostly due to trees and terrain.
The storm eventually went outflow dominant and with no other storms taking on supercell characteristics, I decided to call the chase and head home. Storms were firing along the cold front but cold fronts are not big tornado producers due to the undercutting nature of the cold front. The storms were not severe when I intercepted them and I figured I would try to at least get a nice lightning shot. Checking the radar, I noticed a small area of rotation that was just to my southwest. So I jumped on the interstate and pushed south to get a better look. Keep in mind, FROPA (FROntal PAssage) had already occurred at this point. Again, due to their undercutting nature, cold front storms are fairly non-conducive to tornadogenisis.
However, as I made my way south along I35 a feature in the rain began to form. The rain tapered and to my surprise there was a rotating wall cloud with a nice bowl funnel crossing the highway a few miles to my south. I was impressed! I figured I might see a wall cloud but a full fledged funnel? Thankfully, there was an exit just to the south of the mesocyclone.
I took H highway towards Gilman City, MO in Harrison county and paralleled this developing tornado. It was a fairly weak tornado but it was still a good tornado! As soon as I saw the ground circulation, I phoned Clinton county emergency manager (Corey Sloan) as I knew he could relay a report to the NWS. He took down my report and within minutes Pleasant Hill NWS was calling me to confirm what I was watching. They promptly issued a tornado warning for the storm I was on.
A while later, I spotted another tornado (a very weak tornado) just north of Chillicothe. It was probably a good mile or more away from me but it was weakening and moving right at me so I positioned myself just a few yards to the south of where I thought it would be. It kept coming towards me. The funnel was easy to see as it moved over the top of me.
After all was said and done, I was treated to the best lightning display I have seen since 2011!