…EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM PDT /9 PM MST/ THIS EVENING BELOW 4500 FEET… * WHAT…Dangerously hot conditions expected below 4500 feet. * WHERE…Elevations below 4500 feet. In Arizona, Northwest Plateau including Littlefield and Tuweep. In Nevada, Red Rock Canyon and southern Clark County including Primm, Searchlight,