Figure 4. Arizona Drought Status (released 10/15/09)
Source: U.S. Drought Monitor

Unusually dry conditions persisted again this past month and worsened short-term drought conditions across Arizona (Figure 4a). The October 13 update of the U.S. National Drought Monitor shows a dramatic expansion in moderate and severe drought conditions across the state since last month. All of Arizona is experiencing some level of drought, and more than 50 percent is classified in the severe drought category (Figure 4b). The rapid expansion of severe drought conditions across eastern Arizona reflects the lack of summer monsoon precipitation from July through September; Arizona experienced the fourth driest August since 1896.

Numerous drought impacts have been reported in recent months on the online reporting system “Arizona DroughtWatch.” Many effects are located in southeast Arizona, where summer rainfall was less than 70 percent of its historical average in many places. Several resource managers in this region report that many perennial streams have very low flows or are completely dry, which is unusual for this time of year. Ranchers also report impacts, noting that drought has reduced forage nutritional quality and quantity and desiccated stock ponds. The conditions have caused some ranchers to sell livestock. Rangeland experts also report that seed production of grasses was lower than normal due to drought stress, which could impact the recovery of range conditions next summer. Crop production in this region was also impacted, with local farmers reporting below-average yields, poor crop quality, and unusual levels of crop damage from wildlife.

Notes: The Arizona section of the U.S. Drought Monitor is released weekly (every Thursday) and represents data collected through the previous Tuesday. The 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.

More Information:
For the most current Arizona drought status maps, visit:
http://www.azwater.gov/dwr/drought/DroughtStatus.html