6-hour QNH trend

A sparkline of the last 8 altimeter observations (~6 hours at major airports). Tells the pilot whether pressure is rising, falling or stable.

• Green = rising. Often dry-sector flow, possible improvement
• Orange = falling. Typically tied to active transitions: rain, thunderstorms, fronts
• Grey = stable. Common with stable highs or uniform air masses
• Δ 1H is the numeric change over the last hour in hPa