Home » Supplemental Figures for the December 2010 La Niña Drought Tracker

Supplemental Figures for the December 2010 La Niña Drought Tracker

Supplemental Figure 1. In general, dry conditions occurred in the Southwest during the last moderate La Niña event in 2007–08, although there was variability. This image displays November–March precipitation during the 2007-08 La Niña event. Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 2. Wet early winter conditionsoccurred in the Southwest during the last moderate La Niña event in 2007–08, although when the winter was over precipitation in most regions was below-average. This maps displays November–December precipitation during the last moderate La Niña event in 2007-08. Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 3. Dry mid- to late-winter conditions reigned in many regions in Arizona and New Mexico during the moderate La Niña event in 2007–08, particularly in the southern half of both states. This map displays the January–March precipitation during the last moderate La Niña event in 2007-08. Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 4. Dry conditions in most regions in Arizona and western New Mexico occurred during moderate and strong La Niña events. This map shows the precipitation pattern for the November–March period for all moderate and strong La Nina events since 1960 (seven total). Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 5. Below-average precipitation in many parts of Arizona and New Mexico have occurred during strong La Niña events. This maps shows the precipitation pattern for the November–March period for the three strong La Nina events that have occurred since 1960. Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 6. During moderate La Niña events, dry conditions have occurred in the southern portions of Arizona, while northern regions of the state and New Mexico have experienced on average wetter-than-average precipitation. This map shows the precipitation pattern for the November–March for the four moderate La Niña events that have occurred since 1960. Data is expressed as the percent of the 1971-2000 average. Image is from WestMap using data from the Parameter-elevation Regressions on Independent Slopes Model (PRISM) statistical technique.

Supplemental Figure 7. La Nina events increase chances for dry conditions in the Southwest during the December–February period. The image is from NOAA-Earth Systems Research Laboratory. Extreme is defined as being in the wettest or driest 20% of the 100 year record.

Supplemental Figure 8. La Nina events increase chances for dry conditions in the Southwest during the January–March period. The image is from NOAA-Earth Systems Research Laboratory. Extreme is defined as being in the wettest or driest 20% of the 100 year record.

Supplemental Figure 9. La Nina events increase chances for dry conditions in the Southwest during the February–April period. The image is from NOAA-Earth Systems Research Laboratory. Extreme is defined as being in the wettest or driest 20% of the 100 year record.