Moffatt takes fifth at world champs
Facing arctic conditions more suited to polar bears, the Woolgoolga athlete separated fellow Aussies Erin Densham (fourth) and Felicity Abram (sixth) as the only visitors from Australia to finish in the top ten.
Northern Beaches triathlete Alee Sharp wound up in twelfth spot.
Less than a minute after a thrilling sprint finish between Tucker and American Sarah Haskins down the final stretch, fans were treated to another incredible three-way sprint for bronze with New Zealand's Samantha Warriner edging out Densham and Moffatt.
The Americans and British dominated out of the water by holding the first five positions.
Out onto the testing 40-kilometre bike course, Haskins and Tucker decided to break away and increased the lead to a full minute by the midway mark.
The first chase pack included Moffatt while Denshan stayed with the second group. By the fifth lap, one huge chase group of 34 women were all in pursuit of Tucker and Haskins.
Haskins was first out of T2 with Tucker just five seconds back but by now, Moffatt was a full two minutes in arrears and battling to keep up.
With the two leaders running together until the final turn when Tucker powered ahead to become just the second British woman to win an elite world championship.
Haskins took the silver for her first ever world championship medal.
"I went into today's race still not feeling 100 per cent, I was coughing a lot and at first was just happy to be on the startline," Densham said from Vancouver.
"The weather conditions have to be some of the toughest I have ever raced in.
"Running into the water, the coldness just hits you and even with a wetsuit on when the water is 11 degrees, it stings.
"We did everything we could to rug up and prepare with good wool underneath our cossies but I still got cold on the bike.
"We all did such as great job, three girls in the top ten and Alee just behind in twelfth, I think shows what we are capable of doing."