Millions of Americans are bracing themselves for another day of record-setting high temperatures Sunday in a heat wave blamed for at least 30 deaths in the central and eastern United States.

In Washington Saturday, temperatures pushed past 40 degrees Celsius, as many outlying residents remained without power more than a week after deadly summer storms battered the region.

The National Weather Service says relief will likely be felt by Monday, as a cold wave from Canada begins pushing temperatures below seasonal averages in much of the north-central and Mid-Atlantic states. However, forecasters say strong storms are expected to accompany the front, and may cause more problems in states still struggling to recover from recent deadly storms.