Low pressure system moves from western Ontario early today to Quebec by Wednesday am producing some light precipitation from the Midwest to the Great Lakes and making it to the Ohio River Valley by the overnight. The bulk of the precipitation is expected to remain in Canada however with freezing drizzle possible in these regions some roads could become slick.
A much more significant storm will be affecting the western part of the country with rain and snow for CA, NV, AZ, UT. western CO, and northwest NM. A few light rain and snow showers could make it into WA, OR, ID, western MT and western WY with the majority of the activity staying south. The heaviest rains will be in CA especially southern CA where flash flood watches go in effect this afternoon for areas such as Los Angeles and San Diego, and the heaviest snows with occur in the Sierra Nevada, northern CA Cascades, and east through south central NV, northern AZ, southwest UT, and southwest CO.