Pacific Northwest heat wave to reach worst day, Northeast braces for heat wave of its own: Latest

A dangerous and record-breaking heat wave has enveloped the Pacific Northwest, with the worst to come for Seattle and Portland -- and soon the Northeast will be hit by a heat wave, too.

Portland, Oregon, reached 112 degrees and Seattle reached 104 degrees on Sunday, breaking both cities' all-time record highs. Canada also recorded its highest temperature ever on Sunday.

Thousands in Washington state were without power Sunday, reported ABC Seattle affiliate KOMO.

The extreme heat has shuttered Portland's streetcar and MAX light rail operations until Tuesday morning in the wake of damaged power cables and power outages, reported ABC Portland affiliate KATU.

Monday is the hottest stretch of the heat wave for Seattle and Portland -- Seattle could reach 109 degrees and Portland 115 degrees.

The oppressive heat is also stretching down to the Golden State; in Northern California, Redding is forecast to soar to 107 degrees Monday.

Cooling centers are open across the West Coast.

Some cooling is expected for Seattle and Portland starting Tuesday and heading into Wednesday.

Meanwhile, the Northeast is bracing for its second heat wave of the year.

Temperatures are forecast to be in the mid 90s Monday through Wednesday. With humidity, it's expected to feel at least 100 degrees in Boston, New York City, Philadelphia and Washington, D.C.