Overland fireball explosion delivers data on meteor airbursts

2026, August 14. USA, Washington. Fireball. Overland. Not linked to the Perseids meteor shower. Sonic boom. Delayed sound propagated over 100km from event with concurrent signature exceeding double that distance. Time: around 07:47 UT.00:48. Travelling north. Seen in British Columbia, Oregon, Washington. Multiple fragmented events throughout the entry, with a highly possible meteorite fall. The sound also registered on infrasound instruments at Washington volcanoes, including Glacier Peak, Mount Rainier, Mount Adams and Mount St. Helens. Witness accounts included statements such as: The loudest thunder you’ve ever heard, was about 1.5-2 minutes delayed, two almost distinct claps, slightly vibrating windows, a loud boom that shook house about 30 seconds after we saw the light, it scared me and we just had a huge thunderstorm last night that wasn’t nearly as loud, Boom, thunder like sound followed by ground shaking, Low booming noise lasting roughly 5 seconds. Sounded like a whoosh & then a big boom. The impact was marked immediately by a bright white-blue flash across the whole sky, followed 4 minutes later by a dense, deep thud that felt like a shockwave had hit the whole house. I heard a fairly loud pop and a crackle. A deep thud around 1 minute from its sighting. Kind of a hum or buzzing.

Update: Preliminary NASA data: Illuminating phase was 77 to 45 km above the ground, entry speed: 14.5 km/s, average meteoroid diameter: 40 cm, initial weight: 77 kg, energy of the explosion:10,000 kg/TNT, meteorite fall - radar signs indicate that small fragments have reached the ground.

Credit: U.S. Geological Survey Instruments at Glacier Peak, Mount Rainier, Mount Adams, Mount Hood and Mount St. Helens capture infrasound signals.