July 21, 1972: Marguerite D'Amelio looks over debris which was her home on Sierra Road in North Chelmsford. The storm that hit Chelmsford had been sighted by radar at 4:58 in Manchester, N.H. It moved east-southeat at 20 mph and struck at 6 p.m. Area residents reported a heavy violent thunderstorm, then a period of calm before the storm's funnel, reportedly hundreds of yards wide, struck.