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?


Hazardous Inflight Weather Advisory Service


Hazardous Inroute Weather Advisory Service


Hazardous Inclement Weather Advisory Service


Hazardous Instrument Weather Advisory Service

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