Here is Marcus Ericsson pulling out of the Sauber garage.

BBC Sport app users may need to click on the link to see the video.

But just like Fernando Alonso and just like Daniel Ricciardo, Ericsson is out for one lap and that's it, back to the garage.

After Fernando Alonso and Daniel Ricciardo comes the Sauber of Marcus Ericsson.

Sauber have tweeted, saying: "the weather still isn't the greatest, but it'll have to do."

Indeed.

Right, let's see if we can get some cars out there and get back in action.

Hands up, who thought we would have no cars out there today?

Signs of life. Very small signs of life. After Fernando Alonso went out for one lap in his McLaren, Red Bull's Daniel Ricciardo, the fastest man on the first day of testing on Monday, went out to look at the track.

He clearly didn't like what he saw as he also came straight back in after one lap.

Image source, Getty Images

We have an update, ladies and gentlemen. Amazing scenes.

This is Fernando Alonso, the brave Fernando Alonso, going out on the track. OK, he was on full wets but he went out.

BBC Sport app users may need to click on the link to see the video.

But, don't get too excited.

He went out for one lap and then retreated straight back into the garage. But did post a great message on Twitter about him being "P1 in the snow."

Image source, Getty Images

And with snow hope of any action any time soon over in Barcelona we are going to freeze this live page.

If things improve in Spain we will be back with you so hopefully we will see you later on today. If not, our live page for day four (which I guess would become day three) is set to get going on Thursday at 07:30 GMT.

Bye for now.

Andrew Benson
BBC Sport’s chief F1 writer

The third day of pre-season testing was delayed because of snow at the Circuit de Barcelona-Catalunya in Spain.

The track was cleared in the morning but the session was postponed because the medical helicopter could not fly in the poor conditions.

Teams would have been unable to run anyway because of the continuing snowfall and freezing temperatures.

Temperatures are likely to rise but it is unclear if the session will start.

The weather is expected to improve for the final day of this week's first test on Thursday, with highs of 15C predicted on a cloudy day with intermittent showers.

The second and final pre-season test runs from 6-9 March. The opening race is the Australian Grand Prix in Melbourne's Albert Park on 23-25 March.

Image source, Reuters

Just a quick reminder. We have until 17:00 GMT (18:00 in Spain) for us to get any action today.

We are hoping to see world champion Lewis Hamilton today, and he has only had half of a day on the track so far.

Anyone on the track today would be great.

Rob Kershaw: Canada 2011, horrendous rain causing the longest and craziest race I've ever seen. Button went through the pits about six times, crashed with Hamilton and Alonso, was last of the runners, and came back to win it passing Vettel on the last lap. Couldn't make it up.

Ib‏: Not the first time snow caused issues for F1. I recall a Silverstone pre-season test.

Image source, Getty Images

Sweden's Marcus Ericsson is no stranger to the snow. And he has posted this video on Twitter and said the conditions have "made him feel at home".

Jennifer Harris‏: Suzuka, home of the most unpredictable F1 weather. Horrendously soggy Fridays, Saturdays cancelled because of impending typhoon that never happened, but my worst has to be 2014. My seat was undercover but even I thought it should never have gone ahead.

And from a different form of motorsport...

Fernando Alonso doesn't seem confident of any action today. He has posted a snowy picture on Instagram and wrote: "Arctic experience with McLaren today in Spain. #test #notest #test #notest

BBC Sport app users may need to click on the link to see the tweet.

Dan Knutson
F1 journalist in Barcelona

This was the scene as I left the place I am staying this morning to head to the circuit.

Meanwhile, it is 23 C and mostly sunny in Bahrain right now.

Image source, Dan Knutson

Dan Wilcox‏: Has anyone mentioned yet the 1998 Spa race in the torrential rain? Who wouldn't remember that huge crash that involved 13 cars!? And only eight cars finishing.

These are the marshals at the track, and they will be working their hardest to try and get us some action. But there is only so much they can do.

BBC Sport app users may need to click on the link to see the tweet.

Bad news. Some live pictures from Barcelona. And it is still snowing.

Remember, nothing can happen until the medical helicopter can fly over the track.

Will we get any action today? We just have to wait and hope.

Well yes, it seems that Mercedes do. My favourite tweet of the day so far.

Although I wouldn't mind seeing a tweet saying that it had stopped snowing and we're ready to go.

BBC Sport app users may need to click on the link to see Mercedes' snowman.

Our first talking point today is when Formula 1 raced in extreme conditions. Here are some of your early comments, but keep them coming in to us via the hashtag #bbcf1 on Twitter.

Benjamin Collins: Think back to Korea 2010 and being under the safety car in the pouring rain for the first 17 laps ... never in a million years did I think that race was going to go the distance.

Graham Megennis: My first GP was Spa in 89. A race that probably wouldn't have started in the current era. Mansell all over Prost but had to settle for 3rd. Bought a Ferrari umbrella and stood at Eau Rouge. Ended up completely drenched.

Image source, Getty Images

This is the predicted weather for today in the Barcelona area. Snowing and cold, before being very wet and cold. Looks good for tomorrow though.

Remember, these times are the times in Barcelona, which is one hour ahead of GMT.

So the Circuit de Barcelona-Catalunya says that there is a red flag "until the helicopter is able to fly".

However, more encouragingly the gates are open and the fans are able to enter the stands so maybe they are expecting conditions to improve soon.

BBC Sport app users may need to click on the link to see the tweet.