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Written by John Olzsewski
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The introduction of a layer of moist air,
sufficient to contain alto-level clouds and with a depth in which sufficient
vertical development could cause local showers was maintained. Not only
maintained but also expanded as trough-line development, south of us,
approached and pulled in more tropical moisture. There was sufficient activity
to see isolated cumulonimbus cloud form and precipitate their excess moisture:
rain. Although slight showers did fall at several places, Nabas, in the far
southeast, had a 20mm fall. Central Katatura received a 13mm measure.
This pattern increased in its intensity as
a major cold front arrived by Monday.
The clearance was suitably brief and the
return of some upper air moisture was evident by mid-week.
The significance of all this
is that such weather sequences smack of the La Nina weather expectations. The
anticyclone pushing Monday's cold front tracked along almost 40oS and extended
its ridge down to Antarctica: the resultant airflow has brought snow to the
high Drakensberg.
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Written by John Olzsewski
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The Cape of Storms lived up to its old
seafarers' name: wet storms and high swells. Sea swell heights forced astute
skippers to sail well out to sea adding some four days to their journey time
rounding the Cape. The relatively warm state of the Agulhas current, some 2oC
warmer than normal combined with the umpteen vortices and their secondary
developments have contributed to this current scenario.
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Written by John Olzsewski
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The entire Namibia lies in an area where,
because of the limited amounts of rainfall by worldwide standards, such
descriptions as arid, desert and semi-desert abound. It is because these terms
indicate the lower ranges of rainfall, that the importance of recording each
and every rainfall occurrence becomes paramount.
When people of the standing of Professor
P.D. Tyson and Dr J.J. Taljaard go to some lengths to identify individual
rainfall events, in our case daily rainfall, its importance becomes obvious.
Taljaard refers to daily
rainfalls as being the bricks of the rainfall mansion and we live in that
southern African rainfall mansion.
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Understanding Weather 
