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The Week’s Weather up to Friday 16 June Five-day outlook to Wednesday 21 June

The Week’s Weather up to Friday 16 June Five-day outlook to Wednesday 21 June

Southern Hemisphere barometric pressure for Monday 19 June 2017
Source:, GrADS/COLA


The selected map for this week’s weather discussion is the pressure forecast for next Monday, 19 June, showing a marked difference between expected conditions for next week, and this week’s weather.

During this week, two single cold fronts and one linked front crossed south of Cape Agulhas. However, as was expected, the impact on Namibian weather was minimal. Over the largest part of southern Africa, high pressure conditions reigned with a weak anti-cyclonic circulation on the surface, and a more pronounced zonal, west to east, airflow in the upper atmosphere.

The result was a typical see-saw mild winter pattern over Namibia. Very little wind was evident over the interior. On the coastal plain, it was the customary late afternoon, south-west to south, inshore wind. Above the escarpment, nights were cold with a marked airflow from the south-east but less than one hour after sunrise, surface temperatures were above 20°C and the wind backed to a north-easterly direction

This is the result of the interplay between the very delicate pressure differential between the northern (tropical) and the southern (antarctic) systems. It is typically a feature when the difference in barometric pressures is slight, maybe four thousandths of a bar. The external vector is of course the sun, and given that southern Africa does not extend that far south, the sunshine hours per day comfortably stay more than 10 hours and 30 minutes. This is a lot of energy, enough to have a substantial impact during the day despite the night temperatures plummeting to around 4°C.

This gives us our familiar see-saw pattern during the first half of winter. As soon as the sun sets, solar radiation ceases, terrestrial irradiation is at its highest, the energy in the system drops rapidly, the airmass contracts, subsides and barometric pressure rises. This reduces the differential between continental and maritime pressure, the system equalises and the (cold) impact from the south becomes prominent.

When the sun rises, the opposite happens. The surface temperature rises, the lower airlayers expand, and rise, the barometric pressure drops, and the system tends to equalise with tropical conditions. The airflow now comes from the north-east, the day quickly warms up and by late afternoon it feels like a late-summer day.

This only happens when continental high pressure is in control on the surface, and exerts an influence up to the mid-levels at around 25,000 feet. The technical term is ‘ridging’ and it is a results of static conditions from the surface up to the alto levels. During the day its main features can be observed in clear, blue skies, with very little wind. At night, it is witnessed by the sudden cold, the continuing absence of wind, and the brilliant display of the celestial theatre.

What’s Coming

As can be seen from the map, overall conditions will remain subject to high pressure control.

During Saturday and Sunday, the continental high is positioned over eastern South Africa. This high drives the anti-cyclonic circulation over land meaning the see-saw conditions carry on for at least another two days.

By Sunday evening, lower pressures have set in over Namibia’s coastal plain with more wind but the interior remains calm. A cold front is about one thousand km west of Cape Town but it remains offshore following a trajectory far south of Cape Agulhas.

It is only by Monday that local conditions change with the cold front having moved to about one hundred km south-west of Cape Town, but the so-called 540 dam line, where it is 0°C on the surface, does not make landfall.

As can be seen on the map above, all the high pressure cells in the southern hemisphere are relatively subdued, measuring on average 1024 mB, a very normal core pressure for winter. It is only the southern Indian high that is expected to be somewhat more intense but that will have zero impact on Namibian conditions. The interesting feature to notice on the map is that there are only three prominent high pressure cells around the entire hemisphere. This indicates that the distances between cell cores are exceptionally large, meaning there is ample opportunity for warmer air from the north, to intrude in the wide lower pressure channels between the cores.

North to south airflow will continue over Namibia, indicating that real winter has not arrived yet. Thus, cold nights are to be expected but afternoons will be mild.

Only next Tuesday night will be cold in the south-eastern quadrant and frost can occur in the western half of both the Karas and the Hardap regions. This intrusion is brief however, and by Wednesday, the cold will have departed.

Mild Oosweer is expected for Wednesday afternoon and early evening from Walvis Bay further north but it is restricted to the central and northern Namib.


About The Author


In Memoriam. The weekly weather column is maintained in honour of the legacy of John Olszewski, the widely respected and well-known weatherman of Namibia. After writing the weather column for more than twelve years, he has left an indelible mark at the Economist, and the technical ability among the editorial staff to "read" the maps that he used so often. - Ed.

Following reverse listing, public can now acquire shareholding in Paratus Namibia


20 February 2020, Windhoek, Namibia: Paratus Namibia Holdings (PNH) was founded as Nimbus Infrastructure Limited (“Nimbus”), Namibia’s first Capital Pool Company listed on the Namibian Stock Exchange (“NSX”).

Although targeting an initial capital raising of N$300 million, Nimbus nonetheless managed to secure funding to the value of N$98 million through its CPC listing. With a mandate to invest in ICT infrastructure in sub-Sahara Africa, it concluded management agreements with financial partner Cirrus and technology partner, Paratus Telecommunications (Pty) Ltd (“Paratus Namibia”).

Paratus Namibia Managing Director, Andrew Hall

Its first investment was placed in Paratus Namibia, a fully licensed communications operator in Namibia under regulation of the Communications Regulatory Authority of Namibia (CRAN). Nimbus has since been able to increase its capital asset base to close to N$500 million over the past two years.

In order to streamline further investment and to avoid duplicating potential ICT projects in the market between Nimbus and Paratus Namibia, it was decided to consolidate the operations.

Publishing various circulars to shareholders, Nimbus took up a 100% shareholding stake in Paratus Namibia in 2019 and proceeded to apply to have its name changed to Paratus Namibia Holdings with a consolidated board structure to ensure streamlined operations between the capital holdings and the operational arm of the business.

This transaction was approved by the Competitions Commission as well as CRAN, following all the relevant regulatory approvals as well as the necessary requirements in terms of corporate governance structures.

Paratus Namibia has evolved as a fully comprehensive communications operator in Namibia and operates as the head office of the Paratus Group in Africa. Paratus has established a pan-African footprint with operations in six African countries, being: Angola, Botswana, Mozambique, Namibia, South Africa and Zambia.

The group has achieved many successes over the years of which more recently includes the building of the Trans-Kalahari Fibre (TKF) project, which connects from the West Africa Cable System (WACS) eastward through Namibia to Botswana and onward to Johannesburg. The TKF also extends northward through Zambia to connect to Dar es Salaam in Tanzania, which made Paratus the first operator to connect the west and east coast of Africa under one Autonomous System Number (ASN).

This means that Paratus is now “exporting” internet capacity to landlocked countries such as Zambia, Botswana, the DRC with more countries to be targeted, and through its extensive African network, Paratus is well-positioned to expand the network even further into emerging ICT territories.

PNH as a fully-listed entity on the NSX, is therefore now the 100% shareholder of Paratus Namibia thereby becoming a public company. PNH is ready to invest in the future of the ICT environment in Namibia. The public is therefore invited and welcome to acquire shares in Paratus Namibia Holdings by speaking to a local stockbroker registered with the NSX. The future is bright, and the opportunities are endless.