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Published July 25, 2011
U.S. Drought Monitor(data through 7/19/11)
Data Source(s): Data Sources: U.S. Department of Agriculture, National Drought Mitigation Center, National Oceanic and Atmospheric Administration
Much of the western U.S. remains drought-free after a banner wet winter and spring. The exceptions are Arizona and New Mexico, where drought conditions have continued to intensify. The monsoon started with a bang in a few parts of Arizona—although precipitation was not widespread or heavy enough to improve drought conditions—and a bust for most of New Mexico. Across the West, drought expanded slightly, from 21 percent in mid-June to 25 percent in mid-July, according to the July 19 update of the U.S. Drought Monitor (Figure 3). Most of the expansion occurred in western Arizona and Southern California, where monsoon precipitation has been limited. Drought conditions intensified over large portions of New Mexico, eastern Arizona, and southern Colorado. Extreme and exceptional drought conditions expanded across these areas due to ongoing and increasing precipitation deficits.
The U.S. Drought Monitor is released weekly (every Thursday) and represents data collected through the previous Tuesday. The inset (lower left) shows the western United States from the previous month’s map.
The U.S. Drought Monitor maps are based on expert assessment of variables including (but not limited to) the Palmer Drought Severity Index, soil moisture, streamflow, precipitation, and measures of vegetation stress, as well as reports of drought impacts. It is a joint effort of several agencies; the author of this monitor is Mathew Rosencrans, NOAA/NWS/NCEP/CPC.
The best way to monitor drought trends is to pay a weekly visit to the U.S. Drought Monitor website :
Southwest Climate Outlook Staff
- Michael Crimmins, UA Extension Specialist
- Stephanie Doster, Institute of the Environment Editor
- Gregg Garfin, Founding Editor, Institute of the Environment
- Zack Guido, Managing Editor, CLIMAS Associate Staff Scientist
- Nancy J. Selover, Arizona State Climatologist
- Jessica Dollin, CLIMAS Publications Assistant
- Dave Dubois, New Mexico State Climatologist
Please direct your Southwest Climate Outlook comments and suggestions to Zack Guido.
The CLIMAS Web site contains official and non-official forecasts, as well as other information. While we make every effort to verify this information, please understand that we do not warrant the accuracy of any of these materials.... Read full disclaimer