Summary- Strong, stationary, warm upper high pressure continued across Calif on March 13, but will weaken on the 14th. We are seeing a shift to a wetter pattern with resumption of a broad belt of westerlies across most of Calif in by March 18-19. The troughing pattern is bi-modal. Most troughs develop near the coast of northcentral and N Calif, but a few develop in the Great Basin and Rockies area. Forcing for troughs occurring from the N and Calif coast and WSW-ward is from the sea surface temperature anomaly (SSTA) pattern W of Calif. Forcing for troughs over the Great Basin is related to the currently weak El Niño. The combined effect has been wet in N and northcentral California, and drier than normal in southcentral and S Calif, however this is changing to mostly wet in N and central Calif. We still expect occasional southern storm track conditions, with showers and low snow levels in the Sierras in late Mar and Apr.