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|