How do you see today going, then? Expecting any big battles through the field from those towards the back?

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Ian Fergusson
BBC weather forecaster

Air temp is 18C & track recently 26C under brighter conditions. However, a trough approaching from the west looks set to threaten further showers, potentially heavy/thundery in the area, arriving from ~2pm local to race start.

Andrew Benson
BBC F1 correspondent at Spa-Francorchamps

Image source, Getty Images

The rain has been intermittent all day so far, stopping and starting, and varying in intensity, sometimes a downpour, sometimes just spitting. So, a typical Spa day, then.

But that means the grand prix takes on a whole extra level of seriousness. This track is unforgiving at the best of times. In the wet it becomes extreme, and history has taught the sport lessons of the most tragic nature here.

For that reason, decisions about whether to race or not will hang heavy, with two varying contingencies - is there enough grip, and is there enough visibility? Either could prevent the race starting, or cause it to be stopped.

The high-speed nature of Spa means that it takes less rain to stop the cars running than would be the case at Monaco, for example, because the faster the cars go, the more spray they produce, so the quicker it gets to the visibility threshold. If it’s wet enough for the extreme tyre to be needed, that probably means it’s too wet to race. Officials will also be aware of the danger of a car crashing on the straight and coming back on to the track, where it can be hit in the spray by another. Those accidents are typically the most dangerous of all.

The intermediate tyres wear quite quickly at Spa, and if the rain intensifies, the drivers will want fresh tyres, so this could be a race of multiple stops in the wet. A pit stop takes about 20 seconds under green-flag conditions, half that under a safety car.

Image source, Getty Images

Lando Norris put it together when it mattered as he gave himself the best chance of making it three wins in a row by securing pole position yesterday.

His eyes will be set on hauling in Oscar Piastri's nine-point advantage at the top of the drivers' championship.

But, after a dry weekend so far, the rain has arrived today...