- NEW: Rosberg on pole for U.S. GP
- Qualifying cut short by bad weather
- Teammate Hamilton can clinch world title
- Race weekend hit by Hurricane Patricia
Only two of the three sessions were held before officials cut short the action, with Nico Rosberg taking pole from Mercedes teammate and world champion in waiting Lewis Hamilton.
The race proper, weather permitting, is due to be held at 1400 local (1900GMT), but conditions remained unpredictable after the near total wash out of Friday and Saturday's action in Austin.
Britain's Hamilton can clinch his third world championship crown if he scores nine more points than his closest rival Sebastian Vettel and two more than Rosberg.
Vettel, who spun twice in Saturday's sole practice session where Hamilton was fastest, will only start from the seventh row after being given a 10 place grid penalty for changing the engine on his Ferrari ahead of this round.
The Red Bull pair of Daniel Ricciardo and Daniil Kyvat, who so entertained the brave spectators Saturday with their dancing antics, finished third and fourth best to boost their chances of a podium, should the race take place.
Former world champion Jenson Button, only 11th in the under performing McLaren, gave his verdict on the conditions, "proper scary" being his verdict with standing water in some turns on the track.
Hamilton, on the verge of a third world title, appeared unconcerned that his chance of taking pole in the final session was denied. "It was generally good qualifying, lots of fun out there. I'm still happy with the 1-2 for the team," he said.