Significant precipitation occurred in early and late January resulting in very high runoff volumes. January volumes reached near 1500 percent of the monthly median in the Salt River Basin. In the Gila Basin volumes exceeded 400 percent of median with highest volumes on the San Francisco tributary. In the Little Colorado flows were measured in excess of 500 percent of median. Runoff volumes for the February through May period are expected to range from 100 to 300 percent of median. Higher volumes are possible if additional heavy precipitation events occur.

January through May runoff volumes in the Salt River Basin are expected to range from near 150 to 250 percent of the median. The snowpack in the upper Salt Basin ranges from 130 to 200 percent of average and has already exceeded the annual seasonal peak that usually occurs in early March. Due to saturated conditions, additional precipitation during the February through May period may contribute significantly to runoff volumes.

January through May runoff volumes in the Gila River Basin are expected to range from near 100 to 120 percent of median in the Gila headwaters and 150 to 180 percent of median in the San Francsico drainage. The snowpack in the San Francisco Basin ranges from 110 to 200 percent of average and has exceeded the average seasonal peak. Due to saturated conditions, additional precipitation during the February through May period may result in significant contribution to runoff volumes.

January through May runoff volumes in the Little Colorado Basin are expected to range from near 130 to 320 percent of median. Above average precipitation was received in December and January. Snowpack in the Little Colorado southern headwaters is near 200 percent of average and has exceeded the average seasonal peak. Due to saturated conditions, additional precipitation during the Februar through May period may result in significant contribution to runoff volumes.

Differences between the full period forecasts and the residual forecasts may not exactly equal the actual observed volumes due to rounding conventions (see Definitions section).