From Twitter https://twitter.com/drsekula: RT @NWSFortWorth: What is a squall line?? What do we watch out for? Here's some info! #txwx #dfwwx #ctxwx https://twitter.com/NWSFortWorth/status/666349908807385088/photo/1 https://chirp.cooleysekula.net/attachment/4182