FRI 01 JUN 2018Today was a classic case of waiting very patiently for some decent thunderstorms - very humid with dew points in the low 70s F, plenty of instability - just needed to wait for the cap to be eroded from the approaching dryline/trough out west.
|SPC Tornado Probability Forecast
By late afternoon a line of thunderstorms had developed over north-central Nebraska - we nudged a little further east to Brewster (NE) then Taylor (NE) to keep an eye on a couple of developing thunderstorms - eventually we opted for the southern cell, and sat north of Burwell (NE) to let the hail core pass close to us.
The frequency of cloud-ground lightning really ramped up, and large hail began falling around us - Pete ran outside to grab the largest hail stone he could find, and we measured it using a set of callipers. It came in at 1.7 inches, or 4.3 cm - pretty sizeable!
|1.7 in hail north of Burwell (NE)
As we approached Ord (NE) it was rapidly getting dark as the sun set, lightning flashing very frequently behind us. I noticed on radar how the low-level rotation with the storm nearest us was beginning to tighten, and we could see the cloud bases lowering and a wall cloud forming. Shortly after, a tornado warning had been issued, but we needed to keep ahead of this thunderstorm as it was fast approaching - so we drove through Ord, and parked up just SE of town looking back to the N / NW.
|Our GPS location (blue circle) as the tornado warned storm approached from the west
This was the best example I've seen in reality of RFD bowing out, but also wrapping back in to the updraft area where the wall cloud had formed - almost text book!
|Dust starts being picked up by a ground circulation, lifting to the cloud base
|11 seconds later and the gust front hits, knocking my camera and hence subsequent photos are out of focus