Heavy mountain snow in California through Sunday......Severe thunderstorms possible over interior portions of the Northeaston Sunday......Well above average temperatures across the Central U.S....A potent mid-level cut-off low will propagate through interior portions ofthe West and influence impactful weather through early next week. Heavysnow will develop over the Sierra Nevada and Shasta Siskiyous tonight andcontinue through Sunday afternoon as the upper trough moves ashore.Snowfall totals ...