"Tudor Hughes" wrote in message
...

On Jan 3, 8:12 am, "Tony Kenyon"
wrote:
"Lawrence13" wrote in message

...

On Jan 1, 4:55 pm, Teignmouth wrote:

It looks like the BBC Weather presenters don't know which way air
rotates around Low Pressure systems in the Southern Hemisphere. Watch
the latest Weather Show on the BBC iPlayer around 3:30 mins, and they
have Low Pressure over Australia rotating anti-clockwise instead of
clockwise.

http://www.bbc.co.uk/iplayer/episode...er_Show_25_12_...

Back to school for them this week!
The high as well.

Probably a stupid question but what happens when a pressure system (high
or
low) straddles the equator or does this never happen?

Tony



Pretty well never happens, partly because such a system would
leak away across the isobars and there is little mechanism in those
latitudes to maintain a pressure change. With a tropical storm or
hurricane the balancing force is very largely centrifugal, not
geostrophic and such a storm could, I suppose, cross the Equator and
still be revolving in the same sense though I don't think it would
last very long on "the other side."

Tudor Hughes, Warlingham, Surrey.

Thanks Tudor.

Tony