An impactful coastal low will intensify its impacts across California & the Southwest tomorrow. Increasing coastal showers and storms are likely across California tomorrow with isolated showers likely in the Valley and Sierras. Arizona will see strong storms tomorrow and burn scars across both states will see flash flood potential. Showers & mountain snowfall will expand across the Intermountain West Thursday & Friday. The Midwest & Eastern US will enjoy an extended harvest window with mild temperatures this week.