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Understanding Weather -not predicting PDF Print
Written by John Olzewski   
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Understanding Weather -not predicting
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With large areas of the north, central and southern parts now into their third consecutive week of intermittent rain, it is surprising to learn that the central eastern parts, notably the Omaheke region, has not yet received sufficient rain yet. Although falls were recorded every other day or so, intensities in general, were low. The areas where drier weather did prevail include the eastern border areas where, for instance, small plantings of maize are without ample rain and under stress. The far southwest has also not received rain.

The activity associated with the ITCZ would seem to have drifted westward: very likely at this time of year, but not having enabled a lower pressure zone to form and advect activity to the south of Namibia. This has led to occasional patches of good intensity rain: Schlip, in the Rehoboth district, with 60mm, Khorixas with 75mm provide good examples, but several places received far smaller daily totals.
Wednesday in Windhoek gave an interesting example of weather. The previous afternoon saw storm development close to, but largely east of Windhoek. By evening, the lower and alto level cloud patterns indicated drier air moving in.
This was mainly the result of a cut-off vortex near Cape Town which drifted southeastwards bringing drier air over the sub-continent. This process continued until


 
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DATE

Fri 14 Nov - Thu 20 Nov 2008
Volume 22 No.44