Guides
The weather, the way racers read it
Plain answers on the numbers and the flags on every track page, and on what decides a rain-out.
- The racer numbersDensity altitude, explainedThe altitude your engine thinks it is running at. Lower makes more power.
- The racer numbersTrack temperature, estimatedHow hot the surface is, from the sun, the wind and what it is made of. An estimate, and labelled as one.
- The flagsThe weather flags, rule by ruleOne flag per day per track, judged over the hours that kind of track races.
- The racer numbersWater grains, vapour pressure and the correction factorThe humidity numbers drag racers tune by, and the one number that sums up the air.
- Race dayWill the race get rained out?Nobody but the track can say for sure. Here is how the call gets made and what to watch.