With a high temperature of 88 degrees recorded in Portland - the heat index for Portland hit 93 degrees Sunday - the weather service issued an excessive heat warning that remained in effect through 8 p.m. Sunday.
Extreme heat can cause illness and death, especially for at risk-populations such as the elderly and very young. Although we will see some occasional dips in the daily temperatures, the trend shows longer periods of highs in the 90s locking in frequently.
This evening temperatures drop back down in the 80s by 10pm however heat indices are still likely to be in the low 90s for many spots.
The brutal combination of heat and humidity will continue for several more days.
"Temperatures have not reached 100 F in Albany since 1953", said AccuWeather Meteorologist Tony Zartman, "but the city will flirt with that mark both Sunday and Monday".
It was sweltering at the Chicago Cubs home game against the Minnesota Twins Saturday.
Walsh's office is also urging the public to limit outdoor activity to morning and evening hours and to use sunscreen in addition to staying hydrated.
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But it's not just heat that the Midwest has to worry about. The minimum index for a heat advisory is 100.
Temperatures Washington, D.C., Philadelphia, New York City, Hartford, Conn., and Albany, N.Y., have been about 20 degrees above average for four days.
Sunday will be the worst: NY was forecast to reach 98 degrees but it could feel like 107; and Philadelphia was predicted to reach 100 degrees, forecasters said.
Dew points, the measure of water in the atmosphere, will be in the high 60s and low 70s. Some heavy rain possible.
"High pressure will be in place over the region today, leading to another very hot and humid day with unsafe heat", the National Weather Service said.
"The heat may be fatal to anyone and pets left unattended in vehicles", the National Weather Service said.
The NWS posted a reminder Friday that heat kills more people each year than tornadoes, lightning and floods.