Using the Ashley & Mote ('05) criteria, yesterday's squall line appeared to juuuuust barely make #derecho status. If there was a "derecho scale" like the EF scale, it would be a D0. I break it down here: https://t.co/QAA4m088rx pic.twitter.com/DhyqhOOELF

— Jonathan Erdman (@wxjerdman) May 15, 2018