While on an IFR clearance on Omaha Approach Control's frequency en route to St. Joseph, Mo., the controller suddenly announces the following: "Attention all aircraft, hazardous weather information Convective SIGMET 14 Central, for thunderstorms and hail as big as VW hubcaps in an area southeast of Omaha, stretching to St. Joe, Mo., available on HIWAS, Flight Watch, or Flight Service frequencies." That sounds ugly, so you want more information. To begin with, what does HIWAS stands for?
If you enjoyed taking this interactive quiz and would like to see more like it, go to the AVweb Brainteaser page. And if you thought it was unfair, confusing, or a waste of time, we'd like you to tell us that, too. And if you have an idea for a subject that you think would make a good future Brainteaser quiz, be sure to let us know.