In September of 1970, the remnants of Tropical Storm Norma became Arizona's deadliest storm when they contributed to the disaster known as the "Labor Day storm of 1970". As Norma dissipated, moisture from the cyclone was captured in a large extratropical low. The resulting rainfall created deadly floods that killed 23 people and caused huge damages. Two years later, the remnants of Hurricane Joanne caused flooding that created damages up to $10 million (1972 USD) and eight deaths.