A gust of wind sweeps over bare soil, kicking up enough dirt and dust to cut visibility to nearly zero, and for drivers, the dust storm seems to come out of nowhere. Such conditions resulted in a pileup on Interstate 70 last week in western Kansas involving dozens of cars and trucks that left eight people dead. Blinding dust also prompted New Mexico's transportation department to close Interstate 25 from the Colorado border southwest to Las Vegas, New Mexico. Hazy or dust-darkened skies have recalled the “Dust Bowl” of the 1930s, when millions of tons of blowing soil buried farms and coated towns across the Great Plains. Lesser storms occur every year, particularly in the western U.S., particularly when farmland hasn't been planted yet in the spring. Some scientists worry that many motorists don't take them seriously enough.