Environment Canada says winds in a tornado that touched down in the Grand Lake-area of New Brunswick on Saturday moved at speeds of between 135 to 175 kilometres per hour.
The weather agency says the wind speed calculated by meteorologists means the storm is officially designated as an Enhanced Fujita 1, or EF-1.
The Fujita scale for tornadoes used by forecasters runs from zero to five.
The designation came after two federal meteorologists examined the evidence of the tornado's destruction over a pathway of about 15 kilometres.
Environment Canada spokeswoman Linda Libby says the investigators found the storm touched down near Jemseg and started ripping up trees.
As it moved east, three barns were destroyed and three more structures were damaged or destroyed — including another barn — in the Cambridge Narrows area.
The researchers found the debris from the barn in Cambridge Narrows was picked up and carried more 300 metres.
Libby says the last EF-1 tornado hit the province on Aug. 3, 2007, in the Mount Carleton area.