METAR weather code reference for PO (Dust/Sand Whirls)
Well-developed rotating columns of dust or sand (dust devils) observed near the station. They are caused by intense surface heating and are typically small and short-lived, but can occasionally reach heights of several thousand feet. They can momentarily reduce visibility and cause turbulence near the surface.
Here are common ways PO appears in real METAR observations:
POPO HZPO DUThese METAR codes are commonly seen alongside PO or describe related weather phenomena:
Fine particles of earth or other matter raised from the ground by wind and suspended in the atmosphere. Widespread dust reduces visibility and is most commonly reported in arid regions. Dust events can cause significant restrictions to visibility and affect engine performance.
Larger particles of sand raised by the wind to moderate heights, reducing visibility. Sand is coarser than dust and typically stays closer to the surface. Blowing sand can cause engine damage, windshield abrasion, and significant visibility restrictions at airports in desert regions.
A rotating column of air. When reported as FC it indicates a funnel cloud (not touching the ground) or waterspout. When reported as +FC, it indicates a tornado or waterspout. This is one of the most urgent weather reports in aviation, demanding immediate avoidance.