Weather tracker: US and Mexico brace for heatwave as deadly floods hit South Africa

Heat is expected to intensify across western parts of the US and Mexico this week as a ridge of high pressure pushes temperatures well above the seasonal norm. Daytime highs are forecast to reach 10-15C above average in some areas.The US National Weather Service has issued heat advisories for parts of California and Arizona, with extreme heat warnings in force on Monday and Tuesday in places such as Palm Springs, where temperatures could reach 40-43C (104-110F). More broadly, temperatures are expected to climb into the high 30s celsius before the heat shifts eastwards towards the midwest later this week.Meanwhile, severe weather is likely to continue across parts of South Africa, with disruptive rain and damaging winds raising the risk of flooding. Rain moved in from the Atlantic across the Western and Northern Cape on Sunday morning, bringing persistent downpours over much of the weekend. Between Monday and Wednesday, more than 200mm of rain could fall across parts of Western Cape, while mountainous regions could record totals approaching 300mm.Workers repair a bridge damaged by flooding in Western Cape, South Africa. Photograph: Xinhua/ShutterstockThe South African Weather Service has issued several warnings, highlighting the potential for flash flooding, mudslides, rockfalls and damage to infrastructure and property.Heavy rainfall is also expected to coincide with strong, potentially damaging winds. Large areas of southern South Africa, including Western and Eastern Cape, are forecast to experience north-westerly to westerly gusts exceeding 60mph (97km/h) early this week, with even stronger gusts likely over higher ground, particularly across the Cape Fold Mountains.The latest warnings come shortly after heavy rain triggered flooding, road closures and infrastructure damage across the Western and Eastern Cape on 5-7 May. More than 300mm of rain fell in some areas, forcing evacuations in Gamtoos Valley after the Kouga dam exceeded capacity. Power outages and at least 45 road closures left many communities isolated. One person died in Knysna, Western Cape, while more than 2,000 people were evacuated to emergency shelters.