When it touched down it just bypassed the house, twirling between the house and a sleepout, but it uprooted a large macrocarpa tree, blew the dog's kennel away, snapped fence posts and left the yard strewn with firewood.
Mrs Adams said it was over quickly but was still long enough to "frighten the living daylights out of me".
Her neighbour across the road, Rebecca Sturgeon, was also at home when the tornado blew in.
She watched leaves blowing horizontally past the door, before the twister wrecked three glasshouses in the backyard. It blew the glass out of two glasshouses, and buckled another.
The fallen tree has blocked the pedestrian walkway leading under the overhead bridge and Mrs Adams said contractors had cleared away part of the tree where it had landed on the main road.
The Metservice yesterday warned there was a risk of a small tornado developing about coastal areas of Westland due to the unsettled weather conditions.
About 8am yesterday, two Hokitika men photographed a large waterspout out to sea near Serpentine.
The most damaging tornado to hit Greymouth was on March 10, 2005, destroying dozens of commercial buildings and houses.