Mystery sounds from storms could help predict tornadoes

Reported today on The Guardian For the full article visit: https://www.theguardian.com/world/2019/nov/25/mystery-sounds-from-storms-could-help-predict-tornadoes Mystery sounds from storms could help predict tornadoes Scientists narrow down causes of low-frequency rumbles emitted before twisters form Mysterious rumbles that herald tornadoes could one day be used to predict when and where they will strike, according to researchers. Storms emit sounds before tornadoes form, but the signals at less than 20Hz are below the limit for human hearing. What causes these rumbles has also been a conundrum. Now researchers said they have narrowed down the reasons for the sounds – an important factor in harnessing the knowledge to improve warnings. \"The three possibilities are core oscillations [in the tornado], pressure relaxation, and latent heat effects,\" said Dr Brian Elbing, of Oklahoma Stat