This suggests that in medium-sized ice-covered deep lake basins with a similar bottom heat storage capacity, anti-cyclonic
circulation in the upper layer and cyclonic circulation in the lower layer are formed.
SIR - Students of astronomy are aware that the Great Red Spot on Jupiter is a great anti-cyclonic
storm that has persisted for at least 400 years, and the winds of Uranus can reach speeds of 900 km/hour.
E-mailed photographs to colleagues soon established that Bubbles, as Frankie christened the waif, had probably been swept away from his home by strong anti-cyclonic
From there, it only requires the typical anti-cyclonic
circulation over southern Africa to advect the moisture south across Namibia.
From there, with the high pressure cell providing the anti-cyclonic
push, it was just a matter of time before this system crossed Namibia from the north and produces some spectacular weather events over the Kaokoveld, Damaraland, the rest of the Erongo Region and in a north-west south-east band across the southern half of the country.
upper air circulation dominated the northern half of Namibia.
In the upper layers, between 35,000 and 45,000 feet was a strong anti-cyclonic
circulation with its core situated where the Sashi meets the Limpopo.
The moment it slips past the Cape on its perpetual eastbound journey, it becomes the engine that drives the anti-cyclonic
circulation over the sub-continent.
This week's synoptic charts were dominated by an anti-cyclonic
circulation which persisted with its core over the Karas region for most of the week.
Only from Monday onwards, does the high pressure core shifts enough to the east to resume the anti-cyclonic
flow at the surface over northern Mozambique, Zambia and Angola to advect Congo air to the northern half of Namibia.
The older pattern ensures anti-cyclonic
presence, more or less static, in both the upper air and the surface core, fed through this upper core.
A slow anti-cyclonic
circulation over southern Angola lead to north-westerly winds over the north western third of Namibia, advecting some moisture ahead of a trough that was then still over the Atlantic.
A marked anti-cyclonic
circulation was prevalent over most of southern Africa for most of the week.