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Change of weather in 24 hrs
Usually bring precipitation in the next 12-24 hrs
Fair but cold weather. Could mean a approaching hurricane in tropical regions.
Form ahead of storms with constant snow or rain.
Bring thunderstorms in late afternoon if the morning is warm and humid.
Rarely rain occurs.
Downpours of rain or snow.
Thunderstorms, Snow storms and even tornadoes possible.
Severe weather including tornadoes.
Clouds caused by wave wind patterns caused by mountains.
Defined as when the visability near the Earth's surface is less than 1 kilometer due to moisture in the air.