The National Weather Service in Phoenix has issued a Dust Storm Warning for Pinal County until 3:15 p.m. A wall of dust was along a line extending from Casa Grande to Arizola to Toltec to Eloy, moving northeast at 25 mph. There is less than a quarter mile visibility with strong wind in excess of 50 mph. Highways impacted included Interstate 10 and I-8. Cities impacted include Maricopa, Casa Grande and Florence. Dust storms lead to dangerous driving conditions with visibility reduced to near zero. If driving, avoid dust storms if possible. If caught in one, pull off the road, turn off your lights and keep your foot off the brake. Motorists should not drive into a dust storm.