Donald Trump on Wednesday promised the “show of a lifetime” for the Fourth of July and said the cost of his extravaganza will “be very little compared to what it is worth” as questions arise about the final tally taxpayers will face when the “Salute to America” is over.

In addition to the questions of cost raining on Trump’s holiday parade, his celebration faces the literal threat of rain – massive thunderstorms are in the forecast and could result in the festivities being cancelled.

But the president is plowing ahead, arguing since the military already owns the tanks and planes, his “Salute to America” will actually cost very little.

“The cost of our great Salute to America tomorrow will be very little compared to what it is worth. We own the planes, we have the pilots, the airport is right next door (Andrews), all we need is the fuel. We own the tanks and all. Fireworks are donated by two of the greats. Nice!,” he wrote on Twitter.

The cost of our great Salute to America tomorrow will be very little compared to what it is worth. We own the planes, we have the pilots, the airport is right next door (Andrews), all we need is the fuel. We own the tanks and all. Fireworks are donated by two of the greats. Nice!

— Donald J. Trump (@realDonaldTrump) July 3, 2019

While two firework companies have donated the $750,000 show, the president’s figures likely didn’t take into account the man hours need to run the aircraft – there are estimates it could take up to five or six figures per hour to fly the planes he wants in his flyover.

It costs about $205,000 an hour to fly the Boeing 747 that goes by the call sign Air Force One when Trump is on board, University of Denver professor Andrew Sherbo, who tracks such figures, told NPR.

The cost per hour for flying the F-35 can be $20,000 or more, according to Defense Department comptroller.

And The Blue Angels – the U.S. Navy’s demonstration squad – could cost $6,000 for the day, said Sherbo, a former Pentagon official.

Meanwhile, a close eye is being kept on the weather with storms in the forecast.

The heat and humidity in Washington D.C. may trigger afternoon and evening storms on the Fourth, which would disrupt the flyovers and the fireworks.

Scattered storms are most likely to take place between 2 p.m. and 10 p.m., the Washington Post reported. Trump is scheduled to speak at 6:30 p.m.

Lightening and thunder would put an end to Trump’s plan to address the nation from the Lincoln Memorial, showcase American military might on the National Mall, and have the military aircraft fly by.