Ferrari's Sebastian Vettel fastest on day two
Mercedes' Valtteri Bottas second, McLaren's Stoffel Vandoorne third
Williams' reserve driver Robert Kubica faster than team-mate Sergey Sirotkin
Red Bull's Daniel Ricciardo was fastest on day one
McLaren's Fernando Alonso spun and lost a wheel on day one
Get involved: How would you spice up testing? #bbcf1
Dan Knutson
F1 journalist in Barcelona
The drivers are struggling to get heat into their tyres out on the track. Back in the pits, however, the tyres are snug in their heating blankets. Like these stacks for Sebastian Vettel in the Ferrari garage.
Image source, Dan KnudsonNeither Valtteri Bottas nor Robert Kubica stay out long and we are back in a situation where no-one is on the track. The session is meant to go on until 17:00 GMT, so still time for a few more laps if the weather improves.
We may just not be done yet. The magic words 'on track' have just flashed up on my Formula 1 live timing app and have been placed next to Valtteri Bottas. A bit of snow is no bother for a Finn.
He has already done 94 laps. He wants more.
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No Marcus Ericsson in his Sauber on the track today, but he has been meeting fans and talking to the media. Sometimes at the same time.
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Just on cue, Red Bull's social media team come up with the goods. Watch even more of Max Verstappen versus the mountain with this great video. Click the link etc etc etc to enjoy it.
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I love this. Watch Max Verstappen snowing off his skills in wintery conditions.
Obviously it's not from today, but some good snow-related Formula 1 action.
BBC Sport app users may need to click on the link to see the tweet.
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#bbcf1
Philip Valentine: To spice up testing, I'd just make all teams publish and broadcast more details about the runs and so on as it happens. Would make it more interesting if we knew the ins and outs of the times on the board and what they were actually doing. Screw secrecy and sandbagging.
Ben Wire: I'd spice it up by equipping each car with a Bond-like machine gun (infrared of course: Health & Safety). Spectators get infrared rifles. If a car records a hit then technology reduces horsepower by 20% for 10 seconds.
Alex Holland-Martin: I wonder if Michael has had his lunch yet with no lunch break also you want a cuppa?
I'm good cheers, but thanks for asking. No lunch just yet, just snacks at the desk. Sports journalism. All about the glamour.
You know what Ben, you talk about health and safety but shining a Bond-like machine gun into the eyes of drivers while they are going at insane speeds? I don't know. I just can't see Liberty Media going for it.
Driving in the snow is never really a good idea. But at more than 200 miles per hour, it would be absolutely nuts.
Snow stops play in Barcelona.
BBC Sport app users may need to click on the link to see the tweet.
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Renault's Carlos Sainz is one of those back in the pits, well they are all there. His reason for leaving the track - it's snowing.
Is that going to be a case of snow ends Formula 1 racing early? Not many times can that sentence have been written before.
BBC Sport app users may need to click the link to see the tweet.
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Eleven drivers have been on the track today. But at the moment, no-one is out there.
This is something Robert Kubica would have dreamed of happening for a long time.
This is his first pre-season test in seven years since a life-changing accident in February 2011 at the Ronde di Andora rally, in which his right forearm was partially severed.
Watch him in action by clicking on this link, courtesy of the F1 Twitter account.
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David Nutley: I thought it was a given that Kubica was faster than Sirotkin, but unfortunately he's also poorer, hence only getting the reserve seat.
Kubica's 1:21.495 is 0.327 seconds quicker than Sirotkin's 1:21.822. The Russian has also been out on the track today for 52 laps, compared to 31 from Kubica.
Image source, Getty Images
Image source, Getty ImagesHe may be the fastest today, but Sebastian Vettel has also caused a red flag when he found some gravel
Charles Leclerc is back in the pits, but it has been a busy day for him with 80 laps under his belt. He has also nudged himself in front of Kevin Magnussen of Haas.
The Dane is now the slowest man of the day, with Nico Hulkenberg and Lewis Hamilton, who we had expected to see, not hitting the track at all.
Watch a few seconds of Leclerc in action here. BBC Sport app users may need to click on the link to see the tweet.
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Max Verstappen, on the mediums, nearly grabs third spot, but misses out by 0.001 seconds to stay just behind Stoffel Vandoorne, by the narrowest margin possible.
Image source, Getty ImagesNo Romain Grosjean for Haas today, well, not on the track anyway, he has still had media interviews to do.
BBC Sport app users may need to click on the link to see the tweet.
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Have Williams made the right choice with their drivers? Robert Kubica has gone faster than Sergey Sirotkin, who was selected over him for the second Williams seat for this season.
Both men have also gone faster than Lance Stroll's best effort yesterday.
All of their best times have come on the softs with Kubica recording a time of 1:21.495 from his 29 laps so far, compared to 1:21.822 from Sirotkin in his 52 laps.
Stroll's best time yesterday was 1:22.142.
Image source, Getty ImagesOne final video from Greg Kingston from the track. Great stuff, thanks Greg.
BBC Sport app users may need to click on the link to see the video.
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Dan Knutson
F1 journalist in Barcelona
It’s not cold! This Williams crew member is wearing shorts even though it is 4.0 C degrees.
Image source, Dan KnutsonThe top two have been out there for ages. Sebastian Vettel has done 75 laps, Valtteri Bottas 0.303 seconds behind in second has done 86.
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