The Convective SIGMET, the Hourly Thunderstorm Warning Issued at Fifty-Five Past the Hour, and the Embedded Convection Scenario That Makes This the One Weather Product You Cannot Afford to Skim
Convective SIGMETs are issued hourly at :55 past the hour and cover thunderstorm hazards including embedded convection that's invisible from the cockpit - here's how to read and use them.
Pattern