The 1984 Soviet Union tornado outbreak, also known as the 1984 Ivanovo tornado outbreak, was a devastating and extremely deadly tornado outbreak that struck the Ivanovo and Yaroslavl regions north of Moscow, an area over 400,000 km2, on June 9, 1984. At least two of the eleven known tornadoes were violent events, equal to F4 or higher in intensity on the Fujita scale. It was one of only three disastrous tornado outbreaks in modern Russian history, and the third-deadliest tornado outbreak in European history.