NATAL, Brazil — Jurgen Klinsmann speaks with pragmatism. He books his airline tickets with hope.

The U.S. coach caused a stir in the lead-up to soccer’s championship when he said that “I think for us now, talking about winning a World Cup is just not realistic.”

But on the eve of the Americans’ opener against Ghana, he revealed this: “I booked my flight after the final.”

The U.S. has never advanced after starting with a loss, and it is grouped with the 37th-ranked Black Stars along with No. 2 Germany and No. 4 Portugal.

A two-day downpour has flooded some streets in this northeastern Brazilian beach town. While the skies started to clear a bit Sunday, the forecast was unsettled for tonight’s game, when the Americans try to avenge losses to Ghana that knocked them out of the past two World Cups.

Klinsmann sounded just like the U.S. Postal Service.

“It’s raining. If it’s snowing. If it’s — what else? — thunder or lightning ... field wet, field dry, heat, humidity, whatever,” he said Sunday. “We’re not worried about that stuff at all.”

Natal’s City Hall declared a flood alert and evacuated dozens of residents as a precaution in the Mae Luiza neighborhood in the city’s west.

Still, the field appeared firm during workouts Sunday at the new Arena das Dunas. The forecast calls for a temperature of about 80 degrees, high humidity — Natal is 400 miles south of the equator — and a slight chance of showers.

“The weather is what it is, and as players that’s not something we can control,” midfielder Michael Bradley said. “You get to this point, you’re not worried about little details.”

Thousands of U.S. fans are expected. The American Outlaws supporters group chartered two Boeing 767s from Houston that brought 530 fans to Brazil, and the U.S. Soccer Federation said it sold its official allotment of about 2,000 tickets.

Ghana beat the Americans by identical 2-1 scores in the final group-stage game at Germany in 2006 and in the second round at South Africa four years ago. The U.S., appearing at its seventh straight World Cup and 10th overall, has never lost to a team three straight times in the tournament.

Teams that won their openers have advanced 85 percent of the time since the 32-nation format began in 1998. Just 9 percent of nations starting with a loss advanced.

“This is just an awesome moment because that’s the biggest stage you can have, where you kind of want to show that you improved, and nothing better than against the team that beat you the last two World Cups,” Klinsmann said.