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Most of the time you can't see the way that air flows. It's invisible. But when it's snowing you can see which way the snowflakes are going.
Outside my 7th floor office, the snow was going up the front of the building this morning, but horizontally at the side. There was no snow on the ground - perhaps it's all on the roof. I expect that there are always odd air flows, as we're surrounded by other tall buildings, but almost all the time they pass without notice. They're invisible.
Aerodynamicists put objects in wind tunnels to study air flow, and use smoke instead of snow. People have put dye in rivers to find out where they come out after they disappear into caverns. I just waited for it to snow.
Outside my 7th floor office, the snow was going up the front of the building this morning, but horizontally at the side. There was no snow on the ground - perhaps it's all on the roof. I expect that there are always odd air flows, as we're surrounded by other tall buildings, but almost all the time they pass without notice. They're invisible.
Aerodynamicists put objects in wind tunnels to study air flow, and use smoke instead of snow. People have put dye in rivers to find out where they come out after they disappear into caverns. I just waited for it to snow.
