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Author: Weatherman

The Week’s Weather up to Friday 21 April Five-day outlook to Wednesday 26 April

Precipitation forecast from Friday 21 April to Saturday 29 April Source: wxmaps.org, GrADS/COLA A rather extraordinary weather week for southern Africa. At the beginning of the week, a high pressure cell has wrapped itself around the southern Cape, the core barely remaining offshore. In the wake of the frontal system preceding the high, a substantial low pressure system developed, morphing into a proper vortex as the week progressed. It is notable that the vortex remained in situ some 500 km south of Madagascar, blocking the eastward movement of the high around the continent’s southern extremity. This brought cold, windy...

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The Week’s Weather up to Thursday 13 April. Five-day outlook to Tuesday 18 April

Precipitation forecast from Thursday 13 April to Friday 21 April Source: wxmaps.org, GrADS/COLA A prominent mid-level trough swept across Namibia from west to east from Saturday to Thursday. At the beginning of the week, the trough maintained its position over the western half, only shifting slowly to the east but by Wednesday it has gathered momentum, moving rapidly to the north-east. The slant at which the trough ran, first from north to south, then from north-west to south-east made it miss the southern Namib so despite good rains over very large areas of the north-western, northern and eastern sections...

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The Week’s Weather up to Friday 07 April. Five-day outlook to Wednesday 12 April

Precipitation forecast from Friday 07 April to Saturday 15 April Source: wxmaps.org, GrADS/COLA For the first time this season, the core of the South Atlantic high pressure cell reached 1032 mB. At the same time the 1024 mB isobar, the more typical core strength, lay spread over a vast area in the southern ocean. As the week began, the South Atlantic high was still separated from the southern Indian high but during the week, as the South Atlantic high moved closer to the continent, the 1024mB isobar stretched from deep in the Atlantic, some 4000 km west of the...

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The Week’s Weather up to Friday 31 March – Five-day outlook to Wednesday 05 April

Precipitation forecast from Friday 31 March to Saturday 08 April Source: wxmaps.org, GrADS/COLA When the season transitions from a summer to a winter stance, the daily interaction between opposing systems becomes visible. For the duration of this week, the noticeably cooler nights had an impact as far north as Grootfontein. The unseasonally colder early mornings were as much a result of high pressure control from the south as it was from an easterly airflow, later in the week, advecting colder air all the way from the southern Mozambican Channel. This was the same high pressure cell whose core shifted...

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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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