Postpublished at 17:36
So Nico Rosberg was quickest in FP1, setting a lap time of 1:53.989. There's just over a two-second gap to Daniil Kyvat and his Red Bull team-mate Daniel Ricciardo is in third.
Carlos Sainz is fourth, Lewis Hamilton fifth.
Summary
Second practice cancelled - lightning threat to circuit marshals
Heavy rain and storms expected all weekend as a result of Hurricane Patricia
Rosberg fastest in first practice, Hamilton 5th
Hamilton could win title in Austin
Postpublished at 17:36
Postpublished at 17:33 British Summer Time 23 October 2015
Chequered flagpublished at 17:32
That's that then. Not the most exciting or revealing practice session ever. In fact, it might be the least exciting or revealing practice session ever.
What we have learned is that the track is a bit bumpy. There's no change to the top five.
Postpublished at 17:30
Speaking of Fernando Alonso, he's decided to liven things up by going off the track. It's no catastrophe, as there's plenty of run off and he's back on his way.
Postpublished at 17:29 British Summer Time 23 October 2015
Postpublished at 17:28
Three minutes of the session left and basically nobody can be bothered. Most of the drivers have gone back to their luxury cabins to enjoy a cup of herbal tea. Alonso and Bottas are out there.
Postpublished at 17:27
The Red Bull's of Daniil Kyvat and Daniel Ricciardo are second and third respectively. So to celebrate, here's a picture of Ricciardo serving food to a very happy customer.
Image source, Getty ImagesPostpublished at 17:24 British Summer Time 23 October 2015
Postpublished at 17:23
Jenson Button and Fernando Alonso are putting the McLaren to the test - but the results aren't scintillating at the moment. Alonso is 2.850secs behind Nico Rosberg, down in ninth. Button is almost another second further back in 13th.
get involved Get Involvedpublished at 17:21 British Summer Time 23 October 2015
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Postpublished at 17:16 British Summer Time 23 October 2015
Image source, Getty ImagesNico Rosberg is out of the car and looking pretty chilled, leaning against a railing and taking in the times on a TV screen. We're unlikely to see the German out again in this session.
Postpublished at 17:14
Ferrari's Kimi Raikkonen and Sauber reserve driver Raffaele Marciello are the only men on the track right now, as we close in on the final 15 minutes of FP1. Raikkonen is more than two seconds behind leader Nico Rosberg after the first sector.
'McLaren can win next year'published at 17:10
Andrew Benson
Chief F1 writer in Austin“There’s nothing like a bit of pressure to focus the mind, and that is exactly what Fernando Alonso has put on McLaren and Honda with his comments on Thursday.
"What step do you need to make to say that next year is the right direction? ‘Two and a half seconds,’ Alonso said. ‘If we improve two and a half seconds we will win next year.’
"Is that realistic? ‘Yeah, I think so.’ The bold words were straightforward enough - we have good plans, Honda is optimistic about the progress they can make with the engine.
"But the underlying message was very clear - a reminder that Alonso went to McLaren to win, that his patience is not infinite, and that they need to get their act together. Fast.”
Postpublished at 17:07
Image source, Getty ImagesThe temperature has climbed slightly in Austin - which means the track is getting stickier. It also means we might see a bit more pace in the second session.
Postpublished at 17:03
Nico Rosberg leads Daniil Kyvat by 1.235secs at the top of the board. The top five remains the same, with Daniel Ricciardo, Carlos Sainz and Lewis Hamilton in there.
Image source, Getty ImagesPostpublished at 17:00 British Summer Time 23 October 2015
Here's our brilliant weather dude Ian Fergusson with the latest for the weekend:
Postpublished at 16:58
So, 19 of the 20 drivers have registered a lap. The only man to not do so is Pastor Maldonado. The Venezuelan has been sat in the garage staring at his motionless car for most of qualifying - which some of the other drivers might be thankful for.
Postpublished at 16:57 British Summer Time 23 October 2015
Well done Valtteri, well done, sir.
get involved Get Involvedpublished at 16:56 British Summer Time 23 October 2015
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We're asking for your favourite wet race memories, plus your own experiences with rain-soaked roads...
Tyre dilemmapublished at 16:54
As is the way in the southern echelons of America, what was once a wet track has now dried up nicely. That will cause a few decisions around tyres though. Some started on wets, some on intermediates - neither might not be useful at the moment.
Image source, Getty Images