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Understanding Weather -not predicting |
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Written by John Olzewski
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Page 1 of 2
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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