Simulated difference in annual and seasonal mean precipitation

Simulated difference in annual and seasonal mean precipitation (%) for the Northwest region, for 2041-2070 with respect to the reference period of 1971-2000. These are multi-model means from 11 NARCCAP regional climate simulations for the high (A2) emissions scenario. Color only (category 1) indicates that less than 50% of the models show a statistically significant change in precipitation. Color with hatching (category 3) indicates that more than 50% of the models show a statistically significant change in precipitation, and more than 67% agree on the sign of the change. Whited out areas (category 2) indicate that more than 50% of the models show a statistically significant change in precipitation, but less than 67% agree of the sign of the change (see text). Note that the top and bottom color scales are unique, and different from that of Fig. 20. The simulated annual change is mostly upward, with drying seen in southwestern Oregon and central Idaho. Changes are mostly upward in winter, spring, and fall, and downward in summer.