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President Trump has suggested multiple times to senior Homeland Security and national security officials that they explore using nuclear bombs to stop hurricanes from hitting the United States, according to sources who have heard the president’s private remarks and been briefed on a National Security Council memorandum that recorded those comments.

Behind the scenes: During one hurricane briefing at the White House, Trump said, “I got it. I got it. Why don’t we nuke them?” according to one source who was there. “They start forming off the coast of Africa, as they’re moving across the Atlantic, we drop a bomb inside the eye of the hurricane and it disrupts it. Why can’t we do that?” the source added, paraphrasing the president’s remarks.

• Asked how the briefer reacted, the source recalled he said something to the effect of, “Sir, we’ll look into that.”
• Trump replied by asking incredulously how many hurricanes the U.S. could handle and reiterating his suggestion that the government intervene before they make landfall. 
• The briefer “was knocked back on his heels,” the source in the room added. “You could hear a gnat fart in that meeting. People were astonished. After the meeting ended, we thought, ‘What the f—? What do we do with this?'”

Trump also raised the idea in another conversation with a senior administration official. A 2017 NSC memo describes that second conversation, in which Trump asked whether the administration should bomb hurricanes to stop them from hitting the homeland. A source briefed on the NSC memo said it does not contain the word “nuclear”; it just says the president talked about bombing hurricanes.

• The source added that this NSC memo captured “multiple topics, not just hurricanes. … It wasn’t that somebody was so terrified of the bombing idea that they wrote it down. They just captured the president’s comments.”
• The sources said that Trump’s “bomb the hurricanes” idea — which he floated early in the first year and a bit of his presidency before John Bolton took over as national security adviser — went nowhere and never entered a formal policy process.

White House response: A senior administration official said, “We don’t comment on private discussions that the president may or may not have had with his national security team.”

• A different senior administration official, who has been briefed on the president’s hurricane bombing suggestion, defended Trump’s idea and said it was no cause for alarm. “His goal — to keep a catastrophic hurricane from hitting the mainland — is not bad,” the official said. “His objective is not bad.”
• “What people near the president do is they say ‘I love a president who asks questions like that, who’s willing to ask tough questions.’ … It takes strong people to respond to him in the right way when stuff like this comes up. For me, alarm bells weren’t going off when I heard about it, but I did think somebody is going to use this to feed into ‘the president is crazy’ narrative.”

The big picture: Trump didn’t invent this idea. The notion that detonating a nuclear bomb over the eye of a hurricane could be used to counteract convection currents dates to the Eisenhower era, when it was floated by a government scientist.

• The idea keeps resurfacing in the public even though scientists agree it won’t work. The myth has been so persistent that the National Oceanic and Atmospheric Administration, the U.S. government agency that predicts changes in weather and the oceans, published an online fact sheet for the public under the heading “Tropical Cyclone Myths Page.”
• The page states: “Apart from the fact that this might not even alter the storm, this approach neglects the problem that the released radioactive fallout would fairly quickly move with the tradewinds to affect land areas and cause devastating environmental problems. Needless to say, this is not a good idea.”

About 3 weeks after Trump’s 2016 election, National Geographic published an article titled, “Nuking Hurricanes: The Surprising History of a Really Bad Idea.” It found, among other problems, that:

• Dropping a nuclear bomb into a hurricane would be banned under the terms of the Peaceful Nuclear Explosions Treaty between the U.S. and the former Soviet Union. So that could stave off any experiments, as long as the U.S. observes the terms of the treaty.

Atlantic hurricane season runs until Nov. 30.

[Axios]

Reality

The main difficulty with using explosives to modify hurricanes is the amount of energy required. A fully developed hurricane can release heat energy at a rate of 5 to 20×10¹³ watts and converts less than 10% of the heat into the mechanical energy of the wind. The heat release is equivalent to a 10-megaton nuclear bomb exploding every 20 minutes. According to the 1993 World Almanac, the entire human race used energy at a rate of 10¹³ watts in 1990, a rate less than 20% of the power of a hurricane.

If we think about mechanical energy, the energy at humanity’s disposal is closer to the storm’s, but the task of focusing even half of the energy on a spot in the middle of a remote ocean would still be formidable. Brute force interference with hurricanes doesn’t seem promising.

In addition, an explosive, even a nuclear explosive, produces a shock wave, or pulse of high pressure, that propagates away from the site of the explosion somewhat faster than the speed of sound. Such an event doesn’t raise the barometric pressure after the shock has passed because barometric pressure in the atmosphere reflects the weight of the air above the ground. For normal atmospheric pressure, there are about ten metric tons (1000 kilograms per ton) of air bearing down on each square meter of surface. In the strongest hurricanes there are nine. To change a Category 5 hurricane into a Category 2 hurricane you would have to add about a half ton of air for each square meter inside the eye, or a total of a bit more than half a billion (500,000,000) tons for a 20 km radius eye. It’s difficult to envision a practical way of moving that much air around.

Attacking weak tropical waves or depressions before they have a chance to grow into hurricanes isn’t promising either. About 80 of these disturbances form every year in the Atlantic basin, but only about 5 become hurricanes in a typical year. There is no way to tell in advance which ones will develop. If the energy released in a tropical disturbance were only 10% of that released in a hurricane, it’s still a lot of power, so that the hurricane police would need to dim the whole world’s lights many times a year.