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Author: Weatherman

The Week’s Weather up to Friday 24 March Five-day outlook to Wednesday 29 March

Precipitation forecast from Thursday 23 March to Friday 31 March Source: wxmaps.org, GrADS/COLA The weather across the sub-continent is divided into two opposing zones. North of the Orange River latitude, summer conditions are still strong, while south of this line, early winter conditions are showing up in the synoptic charts. In particular, the location and spacing of the two dominant high pressure cells, the South Atlantic and the southern Indian, show a typical early winter pattern. The presense of well-developed frontal systems between the successive high pressure cells, is a further confirmation of wintery conditions. At present, both cell...

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The Week’s Weather up to Friday 17 March Five-day outlook to Wednesday 22 March

Precipitation and temperature forecast from Friday 17 March to Saturday 25 March Source: wxmaps.org, GrADS/COLA The rain season continues unabated albeit at a much lower intensity. For the week, reports of rain came from the Rehoboth, Windhoek, Otjiwarongo, Otavi, Usakos, Ondangwa, Rundu and Bukalo districts with some impressive but localised showers north of Kamajab and throughout the Kunene region. In general, the falls measured between 25 and 55 mm with Windhoek the exception where only a series of brief showers fell late Tuesday afternoon. The week started with the tail of the frontal system that upset Cape Town last...

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The Week’s Weather up to Friday 10 March Five-day outlook to Wednesday 15 March

Precipitation forecast from Thursday 09 March to Friday 17 March Source: wxmaps.org, GrADS/COLA There is a raging debate on the culmination of the rain season. After two wet spells, most Namibian reservoirs are repleted to a greater or a lesser degree but there are still many districts in the west and the south where rainfall has disappointed and grazing is still as poor as during the drought. In the Pacific Ocean, the weak La Nina has never matured but it also has not transitioned to an El Nino either. Going by the so-called El Nino Index (ENI) compiled by...

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The Week’s Weather up to Friday 03 March Five-day outlook to Wednesday 08 March

Precipitation forecast from Friday 03 March to Saturday 11 March Source: wxmaps.org, GrADS/COLA The first half of the week was characterized by the collapse of the cores of both the South Atlantic and the southern Indian high pressure cells. At around Wednesday, both cores only measured 1018 mB, and were located relatively far offshore. When the South Atlantic high is weak and its core displaced to the south, its immediate effect on the south-west coast of Africa is much reduced. During summer, this core typically stays offshore, slipping around Cape Agulhas on its regular passage from west to east....

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The Week’s Weather up to Friday 24 February Five-day outlook to Wednesday 01 March

Precipitation forecast from Friday 24 February to Saturday 04 March Source: wxmaps.org, GrADS/COLA The Inter-Tropical Convergence Zone is by definition an extensive low pressure band that runs around the globe straddling the equator. This band lies between 10°N and 10°S latitidues, thus just over 2000km wide. It tends to be better defined in the northern hemisphere than in the southern because there is more land in the northern hemisphere at that latitude. However, in the austral summer, it wanders far to the south from its usual containment. Then it appears in Africa, South America and Australasia, sometimes as much...

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The Week’s Weather up to Friday 17 February Five-day outlook to Wednesday 22 February

Precipitation forecast from Friday 17 February to Saturday 25 February 2017. Source: wxmaps.org, GrADS/COLA Meteorologists are not known for their humour, their subject matter is far too serious but the South African Weather Bureau drew chuckles from old weather dogs when, on Monday, they described the precursor of Dineo as a “Tropical Disturbance.” It appears, one of the young understudies has never been explained to that TD stand for Tropical Depression. Nevertheless, all the eyes were on the tropical depression in the Mozambican Channel at the beginning of the week. This system developed, almost overnight into a Tropical Storm,...

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The Week’s Weather up to Friday 10 February Five-day outlook to Wednesday 15 February

Precipitation forecast from Friday 10 February to Saturday 18 February 2017. Source: wxmaps.org, GrADS/COLA Tropical storm Carlos east of Madagascar has produced the expected results. Described by meteorologists as a severe storm, its windspeed was recorded at 55 knots about 100km away from the eye. A tropical storm is an intense depression, creating a vortex that may reach as high as 24,000 feet. This mechanism acts like a suction pump or a vacuum cleaner on a massive scale. It carries immeasureable amounts of water vapour aloft leading to a very high so-called vapour load. This is a condition where...

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The Week’s Weather up to Friday 03 February Five-day outlook to Wednesday 08 February

Precipitation forecast from Friday 03 February to Saturday 11 February 2017. Source: wxmaps.org, GrADS/COLA   The South Atlantic high pressure cell remains offshore. The core, measuring a moderate 1024 mB is more than 2000 km away from the continent. It has been in this vicinity since November last year. The only noticeable shift has been southward, first by some 600 km from the Walvis Bay latitude to the Port Nolloth latitude. During January, it made a further transition to the south, with its core now straddling the 40°S latitude. Longitude-wise, it has remained on the same meridian at about 20°W....

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