weather January 6, 2023 11:03 am What Is a Bomb Cyclone? The term “bomb cyclone” describes a storm that’s rapidly intensifying. The weather event happens when the atmospheric pressure of the storm drops 24-millibar (the unit that measures atmospheric pressure) in 24 hours. US & World Videos 2:55 Forecast: Dry, turning windy 2:19 Kari's forecast: Dry, turning windy 2:52 Rob's Forecast: Foggy and dry start to the week 2:54 Forecast: Foggy and dry start to the week 2:58 Cinthia's forecast: Dry, mild & gusty ahead