Widespread Inclement Weather for the East; Dry, Gusty Winds for Southern California

Heavy rain possible across New England from Monday evening into Tuesday. Heavy snow likely downwind from the lower Great Lakes on Monday night and Tuesday. Elevated Fire Weather Risk for parts of southern California over the next several days.

Forecast for Monday, November 30, 2020

A deep layer low pressure system moving across the Northeast will bring widespread inclement weather across the eastern U.S., upper Ohio Valley, and Great Lakes into early Wednesday. Heavy rain and windy conditions are possible across portions of New England Monday night and Tuesday ahead of the surface low, with severe weather possible across southern areas of New England. Portions of Maine could threaten record high temperatures on Tuesday prior to the passage of the system's cold front.

The large circulation of the storm will draw colder air across the Great Lakes toward the Ohio Valley today, changing the rain into snow in these areas. Accumulating snow is expected to last into much of Tuesday across the lower Great Lakes to the Ohio Valley with heavy snow likely downwind of Lake Erie as the storm becomes slow-moving across of the Northeast Tuesday night, with areas downwind of Lake Ontario seeing heavy snow into Wednesday. The snow is forecast to reach as far south as the higher elevations of the southern Appalachians under a cold and blustery northwesterly winds in the wake of the storm. Cold air filtering in behind the storm could threaten record cool high temperatures on Tuesday from the Lower Ohio Valley into the Southern Appalachians and portions of the Florida Peninsula. Record lows will be possible across portions of Texas and the Southern Appalachians Tuesday morning and across the Southern Appalachians and southwest Florida Wednesday morning. Frost is possible in southwest Florida as temperatures dip into the mid and upper 30s under lightening winds.

Moisture associated with another Pacific frontal system moves across the Northern Continental Divide tonight, bringing lower elevation rains and higher elevation snows which spread down the Rockies during the day on Tuesday. By early Wednesday, return moisture from the western Gulf of Mexico should bring rain into the southern Plains, northwest and central Gulf Coast, and lower Mississippi Valley due to an upper-level trough dipping down into the central and southern Plains, which some snow on its backside across the southern and central Plains late Wednesday.

Finally, elevated fire risk is expected across southern California through the workweek due to offshore flow and increasingly windy conditions caused by a strong high pressure system building into the Great Basin and Rockies.

Roth/Kong