Hourly Weather - Tyler, United States

This file photo shows the Rio Grande as it flows south near Taos, New Mexico. The river begins in south-central Colorado and flows through the U.S. state of New Mexico before entering Mexico and spilling into the Gulf of Mexico. Rivers like the Rio Grande and others in the southwestern U.S. have been plagued by drought in recent years. (Robert Alexander/Getty Images) At a Glance About half of the water used for irrigation today comes from groundwater.Problems arise when more...