"NATIONAL WEATHER SERVICE SAN FRANCISCO CA 441 PM PDT FRI APR 16 2004
NOW ... THE LONG STREAMERS OF HIGH REFLECTIVITY APPARENT ON DOPPLER RADAR ACROSS THE BAY AREA ARE BEING CAUSED BY CHAFF...SMALL PARTICLES RELEASED
DURING A MILITARY EXERCISE. PLEASE DISREGARD THESE RADAR RETURNS. "
He asks the good question: "Anyone out there have a clue why there's chaffing going on in an area with three active commercial airports?"