A powerful extratropical cyclone developed c. November 18, 2024, in the Northeast Pacific and struck the Western United States and Western Canada.[8][9] The storm underwent bombogenesis, rapidly dropping its central pressure[10] to a record-tying level of 942 millibars (27.8 inHg).[8] This storm was the first of two bomb cyclones to impact the U.S. West Coast during a 3 day period. The storm was associated with an atmospheric river that dropped large amounts of rain in Oregon and California. The Storm Prediction Center (SPC) issued a rare high risk of excessive rainfall in parts of Northern California, warning of "life-threatening flooding".[11]