✈️ Flight Deck Cheat Sheet: Decoding Wind & Altimeter Traps in METARs
Looking at METAR KJFK 201851Z 31015G25KT 270V350 10SM BKN040 18/09 A2992? Misreading just one group can mean the difference between a butter landing and a runway excursion with a severe crosswind.
📌 Key Takeaways:
True vs. Magnetic Winds: METAR wind reports are referenced to True North (“If you read it, it’s True”). When ATC gives you runway surface winds over the radio, they are referenced to Magnetic North (“If you hear it, it’s Magnetic”).
Variable Wind Spreads (270V350): Don’t just plan for the mean direction (310°). Watch the swing—your headwind can instantly turn into a strong gusting crosswind component right at flare height.
Altimeter Settings (A2992 vs Q1013): In North America, pressure is given in inches of mercury (A2992 = 29.92 inHg). Overseas, it’s given in Hectopascals/QNH (e.g., Q1013). Setting 29.92 when local QNH is 1002 hPa can put your indicated altitude hundreds of feet off from true terrain elevation!
📺 Watch the full breakdown to avoid critical approach mistakes: https://youtu.be/Sb4PHX2yQ2Q
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