Severe thunderstorms also produced hail up to 1 kilogram (2.2 lb) in weight, among the heaviest hailstones confirmed worldwide.
In all, the entire tornado outbreak killed at least 69 people (though the exact death toll is unknown) and injured 804.
Between 00 and 12 UTC on June 9, the strengthening low pressure area moved north-northeast over the northwestern Russian SFSR before undergoing occlusion.
[3] A large, long-tracked, and devastating tornado, considered one of the worst in Russian history, destroyed numerous towns and villages along its path.
Rated F4 on the Fujita scale,[9] the 1130 metres[citation needed] tornado killed at least 69 people and injured more than 130 others.
[5] Near Ivanovo, the tornado snapped or bent pine, spruce, and birch trees about 1–3 m (3.3–9.8 ft) from ground level.
[12] The F4 tornado tracked for 99 miles (160 km)—though some sources suggest only 80 kilometres (50 mi)[3]—before dissipating near Lunyovo in Yaroslavl Oblast.