A fireball traveling at 33,500 mph and exploding over California on Sunday, April 22nd, 2012 was a meteor about the size of a mini van. The resulting booms were heard across Nevada and California a little after 8am.
Eyewitness reported a streaking light accompanied by a sonic boom flooded in from Lake Tahoe, El Dorado County, Placer County, Tuolumne County, Amador County and Nevada County.
It does seem that fireball sightings are becoming more common. Whales in Space has been watching the steady increase, including a massive fireball seen over the UK in March of this year.