Snow Warning creates a hailstorm when the ability-bearer enters battle. The effect lasts for 5 turns unless it is cleared by Air Lock or Cloud Nine, or replaced by another weather condition.
If multiple Pokémon with weather-generating abilities (such as Snow Warning, Drizzle, Drought, or Sand Stream) enter the field on the same turn, each weather condition activates consecutively, starting with the fastest Pokémon. Thus, the resultant weather condition will be from the slowest Pokémon.
Prior to Generation 6, Snow Warning lasted indefinitely upon activation.
