On Wednesday, October 31, 2001, at 09:11 AM, mmotyka@lsil.com wrote:
cpaul <inc@fastmedia.net> wrote :
Witnesses also said they saw a U.S. plane drop a bomb Tuesday at the Bagram front lines, about 25 miles north of Kabul, creating a mushroom cloud that billowed at least 1,000 feet into the air.
http://dailynews.yahoo.com/h/ap/20011030/ts/attacks_afghanistan_549.html
A really big one. Still conventional. Besides, a standard-sized one might have hit a munitions or fuel bunker.
Hell, a 10 acre tire fire in central California made a "mushroom" shaped cloud several thousand feet high.
During Vietnam there were boxcar-sized bombs used to clear an LZ in the jungle. How many tons? I don't know but they made ~100 yard circle.
BLU-82 15,000 lb. http://www.fas.org/man/dod-101/sys/dumb/blu-82.htm