A killer heatwave pushing temperatures towards 130F has turned a 1,000-mile stretch of America into a wildfire tinderbox. Fresh government warnings are in force as the ‘hottest ever start to summer’ in parts continues to rage. Some seven states reaching from Northern Idaho to Arizona are on alert for wildfires after swathes of the region were hit by a weekend blaze. AccuWeather meteorologist Bernie Rayno said: “Intense heat baking parts of the interior West is expected to expand into the Pacific Northwest, raising the risk of heat-related illnesses and fresh wildfires. “Temperatures are foreca…