Drying the Southwest (image) National Center for Atmospheric Research/University Corporation for Atmospheric Research Share Print E-Mail Caption Weather systems that typically bring moisture to the southwestern United States are forming less often, resulting in a drier climate across the region. This map depicts the portion of overall changes in precipitation across the United States that can be attributed to these changes in weather system frequency. The gray dots represent areas where the results are statistically significant. Map courtesy of Andreas Prein, NCAR. Credit Map courtesy of Andreas Prein, NCAR. This image is freely available for media & nonprofit use. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.