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These weather alerts each have their own role: AIRMETs warn about moderate conditions like turbulence, icing, and limited visibility, which can affect smaller or less equipped aircraft. SIGMETs alert pilots to more severe weather events like thunderstorms, volcanic ash, or strong turbulence that could pose serious risks to any flight.
Expect poor visibility, increased turbulence, and slippery runway surfaces. Thunderstorms can also bring windshear and lightning. For example, “WS” means windshear, which is important for approach and landing, while “SLP” provides detailed sea-level pressure information for adjusting your altimeter.
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