Regionally organized winter (DJF) precipitation anomalies over North America are presented in association with cold and warm phases of the ~ Nifio-Southern Oscillation. Variations in low-level flow from moisture sources aDd in upper-level dynamic properties are diagnosed for eKb anomalous precipitation region using DJF composites of upper-and lower-tropospheric winds. sea level pressure. divergence, and vorticity advection. Variance analysis determines which precipitation and circulation patterns are robust and evaluates the predictability of the extreme phase composites with respect to the climatology. In cold phases. the P-=ific Northwest aDd the lower Mississippi Valley regions have above-nonnal precipitation tOtals. The heavier precipitation over the Pacific Northwest is the result of a multilevel onshore flow forced by an amplified Pacific high off the California coast and a single zonal upper-tropospheric jet. In the Lower Mississippi and Tennessee Valleys, the equatorward entrance region of a west-east-oriented jet core combines with anomalous positive vorticity advection (pV A) and a convergent low-level flow off the Gulf of Mexico. resulting in heavier precipitation. Drier than nonnal conditions occur in coastal Aluka aDd California due to negative vorticity advection anomalies aloft, low-level divergence. and weaker onshore ftow. The increased precipitation over the southern Mississippi Valley and the Pacific Northwest, and the drier conditions over Florida. are statistically robust. During warm phases. more precipitation occurs in the coastal regions of Alaska. California, aDd the Gulf of Mexico, whereas drier conditions persist over the Pacific Northwest. Alaskan precipitation is enhanced by strong. convergent. onshore ftow associated with a deeper Aleutian low. upper-level PV A. aDd the northern branch of a split jet pattern. A strong southern subtropical branch of the split jet provides dynamic support for uplift of moisture along the Gulf Coast. The drier conditions in the Pacific Northwest and the wet conditions in Texas aDd Florida are predictable relative to the climatology and are statistically robust.