Low pressure moving through the Northeast was likely to bring cold, wet conditions to New England. New York, Vermont and Massachusetts could see flooding and severe thunderstorms throughout the day.
Fair, dry conditions were expected in the Great Lakes region because of a building high pressure system. An approaching low pressure system and cold front that triggered severe thunderstorms and heavy rain in the Plains were forecast to move into the Midwest, reaching Minnesota and Iowa by Tuesday evening.
A stationary front to the south was likely to cause heavy rain and severe weather in the southern Plains and the lower Mississippi Valley. Flooding was possible.
High pressure building over the West was expected to keep the Great Basin and the Southwest dry and bring warmer temperatures to the coast.
Temperatures in the Lower 48 states on Monday ranged from a low of 30 degrees at Stanley, Idaho, to a high of 105 degrees at Needles, Calif.
