What happened?
A week ago good falls were just making their impact, but previously in this season, the follow-through has wavered: this time the follow-through made waves. For several weeks the core of the southern African ITCZ, the Barotse low, an area of averagely lower air pressure stimulated by both heat and moisture and situated over western Zambia during late December and through January was very much in place.

Heavy rains and resultant floods emanated. The tendency is for such a weather pattern to drift westward. Over a week ago, this drift began. The broad effect was to bring widespread rain across a thirsting countryside.
Tremendous downpours occurred from Thursday, one week ago, through the weekend and into this week.
The range of rainfall occurrence extended from the coast inland.
Consistently high rainfall is to be expected when Congo air is advected southward.
Slight cooling of the air mass, active convection in this moist and unstable air by both day and night and the further stimulation of adjacent storms did enough to provide water where dry conditions had prevailed.
The very heavy falls of the first week of February soaked the Cuvelai catchment and flooded the Oshonas. This continued through the second week. A range of 5 days, from last Thursday to this Monday, has tested benchmarks for rainfall statistics. A farm between Okahandja and Otjiwarongo has set a very definite mark with 367mm across 4 of these days. In other words this would be 12 inches of rain. It is understood that flood plains have developed, farm dams overwhelmed, floodwater broke in more than one area, and roads were washed away or at least damaged extensively.
In the south even Lüderitz registered 0.2mm. Further inland, within the range of the Bethanien-Helmeringhausen escarpment generally more than 50mm were measured across the past week. From Rosh Pinah, northward along the escarpment up to Karibib and Usakos productive falls were recorded indicating the westward extent of the past weekend's rain.
What's coming
From weather patterns of the La Nina-dominated Pacific Ocean to the persistent pattern above SW Angola and the warmer water off the northwest coast all remain rainfall favourable. An anticyclonic cell above the eastern subcontinent helps to steer moisture southwards and with generally light and variable winds in the alto levels couples favourably with the prospect of further rainfalls. Although the anticyclonic presence can introduce a drier, alto layer, the convective moist air ability should not be seriously limited. It seems likely that the showers of the next few days will be in the 10mm-plus range rather than the 30 to 50mm range.