Thunderstorms produce the most severe weather you can find in aviation. And you don't need to be in a thunderstorm to be in trouble. Thunderstorms can launch hail out of themselves up to 20 miles away. Strong downdrafts and microbursts can form underneath them.

In 2026, Thunderstorms remain the most impactful and dangerous weather hazard to aviation due to the "multi-hazard" environment they create, including severe turbulence, lightning, hail, and icing. However, from a logistical and delay perspective, Fog (Low Visibility) is often the most impactful to daily operations, as it can shut down entire major hubs like Heathrow or Shanghai for hours, causing a "global ripple effect" of cancellations. Another "silent killer" in 2026 is Wind Shear, especially during the critical phases of takeoff and landing. For 2026 passengers, Turbulence is the most felt hazard and the leading cause of in-flight injuries. A 2026 "pro-tip" is that while modern jets are engineered to withstand extreme weather, the best safety measure is to keep your seatbelt fastened at all times; even "Clear Air Turbulence" (CAT), which radar cannot detect, is becoming more frequent in 2026 due to the shifting high-altitude jet streams caused by global climate changes.