Blazing heat roasting the United States has swathes of the country parched to the point of ‘flash drought’. Weeks of searing sun magnified under a rainless heat dome has turned miles of green pasture into desert dust bowls. Temperatures show no sign of relenting as national weather authorities reinforce warnings for extreme heat and wildfires. The US Drought Monitor, which logs the weekly drought status, reported a growing threat from mild-June when the ‘heat dome’ settled over America. AccuWeather meteorologist Bernie Rayno said: “Following weeks of intense summer heat and little rainfall, a …