That was an empty shed... Christmas Eve 1999 the entire roof section was lifted off the sides, carried clean over the wall (that the rolled shed is leaning against) and just clipped the top of the drystone wall the far side of the road.
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, unless you are located in an exposed position, I doubt you really did have 40mph sustained gusting mid 50's winds. The weather reports nearly always report the *single* peak gust recorded as if it was the mean wind speed or representative of the gusts. 40mph in the average garden would wreck the plants and have anything not tied down blown all over the place doing more damage as it was flung about. The plants up here disappear in winter and there is nothing loose, 'cause if it is it doesn't stay here long...