What happened: The designation applies to the Bahrain Grand Prix staged at Sepang after the calendar shuffle. Air temperatures are expected above 31 degrees Celsius under FIA heat protocols.

Why it matters: High heat raises demands on driver cooling, tire management and pit-crew procedures. Sepang's tropical humidity adds a variable absent from a standard Bahrain night race.

What to watch: Watch for confirmed start-time procedures and any additional FIA cooling measures before lights out.