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Published November 23, 2010
U.S. Drought Monitor(data through 11/16/10)
Data Source(s): U.S. Department of Agriculture, National Drought Mitigation Center, National Oceanic and Atmospheric Administration
Drought conditions expanded in some areas in the West but decreased in overall extent during the past 30 days, according to the November 19 update of the U.S. Drought Monitor (Figure 3). Nevada is still the western state most mired in drought, with nearly 75 percent of the state classified with abnormally dry conditions or worse. Abnormally dry and moderate drought conditions expanded slightly across parts of the Rockies in Colorado, but also slightly decreased in Idaho and Wyoming. Texas experienced significant changes in drought conditions as moderate and severe conditions expanded in southern portions of the state. Other southern states extending from Louisiana to Florida also are experiencing widespread drought, and conditions will likely persist in these regions, as La Niña events often bring dry conditions to the southern U.S.
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 Michael Brewer/Liz Love-Brotak, NOAA/NESDIS/NCDC.
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