HIGH pressure: windy round the edges, a bit on super-geostrophic winds

Reigate Grammar School Weather Station

2015-02-08_22-03-51 HIGH pressure dominates but is it all calm?

High pressure is known for calm, clear conditions, with little wind, cold frosty and foggy nights especially when there is little cloud. Pretty unexciting weather.  However, HIGH pressure is not as unexciting as all that.  Anticyclones can sometimes be surprisingly windy especially round the edges.  We spend a lot of time learning about LOW pressure, with associated storms and gales and torrential rain but understanding the inner workings of HIGH pressure is important to get the full picture of mid-latitude weather.

So… buckle up for the ride and let’s get super-geostrophic!  First, the wind direction is the result of two forces.  here are links to help understand these forces before proceeding with super and sub-geostrophic winds.

2015-02-08_23-38-08 The winds do blow from high to low… but get pushed to the right by that Coriolis fellow!

So winds do blow from high to low due to the pressure-gradient but…

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From Discovery: “Huge, Slow-Moving ‘Internal’ Waves Wreak Havoc”

sciencesprings

Discovery News
Discovery News

Feb 6, 2015

Oceanographer Rob Pinkel unpacked crates of scientific instruments this week aboard the 272-foot research vessel Falkor while docked in the port of Hobart, on the island of Tasmania. He checked the weather and made preparations along with several dozen other scientific crew members to hunt for an elusive ocean phenomenon, massive “internal waves” that are born on the tidal straits of New Zealand, chug across the Tasman Sea, and bounce off the coastline of Tasmania.

1temp0

“We are expecting to see a large wave in the interior of the Tasman Sea crossing and hitting the slopes of Tasmania,” said Pinkel, a physical oceanographer from the Scripps Institution of Oceanography. “We have some specialized instruments that can see what’s going on in a pretty fast time scale.”

Compared to fast-moving, wind-driven surface waves, internal waves are lumbering giants that can grow to more than 2,000 feet high…

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Pop, pop, and poppety pop.

Pointman's

A friend once turned to me on a day that had no mercy in it and said, “you’re right, there is no God.” We were both watching something slowly unfolding, something cold and just petrifying cruel which couldn’t be stopped by either of us. We couldn’t exert any control over it, we could only watch; emasculated observers at the final end of world extinction event of any residual hope about how low us human beings could really get. Pop, there they go, pop, pop, another couple of the buggers. Pop, pop, and poppety pop and yet a few more of them.

At the time and in a vague distracted sort of way, it broke my heart to see him lose his faith, because I loved him as only one man can love another and I’d always somehow relied on him to be the last unwavering believer in some sort of floor of decency that none of…

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