What is the reason why Disneyland cancel their fireworks?

Especially in summer months, Disneyland's fireworks are cancelled about a fifth of the time because the prevailing winds blow the smoke eastward across neighboring Interstate 5, creating a driving hazard that the California Highway Patrol deems unacceptable. I’ve even seen the fireworks cancelled mid-way through the show. read more

Mostly wind though. If it's a light rain with no wind, they will most likely go on. Even a 10mph wind will cause them not to go off. Even if it's not windy inside the park, doesn't mean it's not windy where they are released/blown (or whatever they call it when a firework explodes). read more

Disneyland canceled their holiday fireworks display again Wednesday night. The cancellation marks the sixth time in the last week that the theme park has canceled their nightly holiday show. Learn more about the cancellation after the jump. read more