Brutal California heatwave to coincide with Fourth of July wildfire risks

Sweltering conditions and power shutoffs may overlap with errant fireworks or badly tended campfires

A brutal and long-lasting heatwave is threatening to wreak havoc across the US west this week, as sweltering conditions, power shutoffs and a severe uptick in wildfire risks coincide with Fourth of July celebrations.

Nearly 90 million people were under heat alerts from the National Weather Service (NWS) on Tuesday morning, as swaths of the south-central and western US were scorched. As pressure builds over the west through the week, the dangerous weather event is expected to stretch for days with little reprieve.