Southwest Climate Outlook January 2013

Date issued

January Climate Summary

Drought: Nearly all of Arizona and New Mexico are experiencing moderate drought or a more severe drought category.

Temperature: Most regions in Arizona and New Mexico experienced temperatures 4 to 8 degrees F below average in the last 30 days as a result of incursions of cold Arctic air.

Precipitation: Most of Arizona and New Mexico experienced less than 50 percent of average precipitation between mid-December and mid-January.

ENSO: Sea surface temperatures are expected to remain characteristic of ENSO-neutral conditions into the spring.

Climate Forecasts: February–April forecasts call for above-average temperatures and below-average precipitation.

The Bottome Line: The winter has been dry thus far. Precipitation across Arizona and New Mexico has generally measured less than 50 percent of average in the last 30 days and since the water year began on October 1. The water contained in snowpacks, or snow-water equivalent (SWE), is also below average across the Southwest, most notably in the upper Rio Grande headwaters and Upper Colorado River Basin where SWE is mostly less than 70 percent of average. Consequently, drought is still widespread and intense in the Southwest. Moderate drought or a more severe drought category covers nearly all of Arizona and New Mexico, with about 9 and 32 percent of Arizona and New Mexico, respectively, experiencing extreme drought. These conditions are not expected to change in coming months, according to the seasonal drought forecast. They may also deteriorate. There is some indication that the February–March period will deliver below-average rain and snow. This in part reflects the historical tendency for the West to experience below-average precipitation when ENSO-neutral conditions occur during the negative phase of the Pacific Decadal Oscillation, which is the current situation. ENSO-neutral conditions also leave room for more variable weather for the western U.S., which makes seasonal forecasting for Arizona and New Mexico more difficult. Nonetheless, if another dry winter does emerge, water stored in many of the region’s reservoirs will continue to decline, posing serious water supply challenges for those reservoirs teetering on the brink of emptiness. This includes San Carlos reservoir in Arizona, currently less than 1 percent full, and Elephant Butte Reservoir in New Mexico, which is currently only 7 percent full and provides irrigation water to New Mexico’s most productive agricultural region.

Published by the Climate Assessment for the Southwest (CLIMAS), with support from University of Arizona Cooperative Extension, the Arizona State Climate Office, and the New Mexico State Climate office.

Disclaimer. This packet 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. The user assumes the entire risk related to the use of this data. CLIMAS, UA Cooperative Extension, and the State Climate Office at Arizona State University (ASU) disclaim any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will CLIMAS, UA Cooperative Extension, and the State Climate Office at ASU or The University of Arizona be liable to you or to any third party for any direct, indirect, incidental, consequential, special or exemplary damages or lost profit resulting from any use or misuse of this data.