The hot, dry northeasterly winds, dubbed as "Diablo winds" in reference to the Diablo mountain range, Diablo Valley, and surrounding geography of same name, periodically occur during the early fall season. These are similar to the Santa Ana winds in Southern California, and have been the cause of numerous devastating fires. The fire began generating its own wind, the defining characteristic of a firestorm. The superheated fire-driven winds combined with warmer, drier air east of the Oakland-Berkeley Hills, and interacted with the ambient cooler, more moist Bay/Coastal air to create erratic, dangerous gusts, which helped produce numerous rotational vortices. All of these combined to help spread the fire, tossing embers in all directions. The wind was so strong that it also blew debris across the bay into San Francisco. Ash fell onto the field of Candlestick Park where the Detroit Lions and San Francisco 49ers were playing during that afternoon. The CBS telecast of the game also showed live footage of the fire. As with the 1989 Loma Prieta earthquake two years earlier, the blimp shots from the national sports media provided many people with first word of the disaster.