Here in southwest Ontario this afternoon, there was an unusual weather pattern. Looking straight up, one could see clouds moving in opposite directions. It was like an animation in a planetarium (remember those?): standing still, but the whole upper hemisphere rapidly shifting/rolling, with some smaller foreground objects moving in other directions. This is the first time I noticed this in a natural steady-state setting.

This METAR from nearby Hamilton says part of the story:

CYHM 071900Z 02009KT 4SM -SHRA BR FEW015 BKN047 OVC070 09/08 A2991 RMK CF2SC5AC2 SLP134

So at the ground level, we had a mild northeast breeze (from 020 degrees at 9 knots) carrying a few clouds at 1500 feet.

The next solid overcast cloud layer was at 7000 feet. The METAR doesn’t show the movement, but the upper winds forecast does:

STN YYZ 3000 6000 9000 12000 18000
FDCN01 1005 2008+04 2425+01 2446-03 2553-14

So at 6000 and especially 9000 feet, a wicket southwesterly wind blew (200 degrees at 7 knots, then 240 degrees at 25 knots).