Fact Sheet 119-02

figures 4, 5, and 6

graphs showing seasonal precipitation for the Colorado Plateau
Figure 4. Seasonal precipitation (standardized anomaly index, SAI) for the Colorado Plateau, classified by El Niño-Southern Oscillation (ENSO) or non-ENSO influence as a function of the Southern Oscillation Index (SOI). Purple, light green, and orange symbols are El Niño, La Niña, and non-ENSO, respectively. SOI was averaged over a 7-month window centered on the midpoint of the season.
graph showing seasonal precipitation for the Colorado Plateau
Figure 5. Seasonal precipitation (standardized anomaly index, SAI) for the Colorado Plateau compared with El Niño-Southern Oscillation (ENSO) chronology of sea-surface temperature (SST; Niño3 Indices) and Southern Oscillation Index (SOI). Color pattern same as figure 4. SST and SOI were smoothed with 5-month running average with ENSO threshold conditions for SST of 0.4 and –0.3°C and SOI threshold of ±0.5 standard deviation.

 

 

graphs showing seasonal precipitation anomalies for the Colorado Plateau
Figure 6. Seasonal precipitation anomalies for the Colorado Plateau classified by strength of El Niño-Southern Oscillation (ENSO) activity. Color pattern same as figure 4.

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