The intense heat wave that has broken thousands of records from the Plains to the Eastern Seaboard will begin to lose its grip on the weather, but not after peaking for millions today.
Temperatures will soar well into the 90s and even past 100 in some big cities from near New York to Raleigh and Charlotte to start the weekend.
Philadelphia, Baltimore and Washington, D.C., are all expected to rise into the low 100s, tying or breaking records.
"Saturday could potentially be the hottest day of the summer for Philadelphia, Washington, D.C., and other cities of the Northeast," AccuWeather.com Expert Senior Meteorologist Alex Sosnowski said.
Of course, the thermometer reading, while impressive, won't do justice to how it truly feels.
The combination of the heat with intense sunshine and high humidity levels will yield AccuWeather.com RealFeel® temperatures as high as 115 in major metropolitan areas during the peak heating of the day, between noon and shortly after sunset.
RealFeel® values this high are at dangerous levels for not only the old and infirm, but everyone who spends a prolonged amount of time outdoors. Hydration and frequent respites in air conditioning will be key to weathering the brutal heat.
Even folks seeking refuge at beach locales will have to endure the searing temperatures thanks to an offshore flow that will only cede to a sea breeze in some areas late in the day.
While the heat will peak in the big cities along I-95 today, record temperatures near or above 100 that other major cities such as St. Louis, Chicago and Cincinnati have become accustomed to will persist yet another day.
However, a cold front which has already erased the triple-digit heat from the Upper Midwest will further squash it to the south over the next few days.
Temperatures above 100 in Philadelphia and D.C. will be replaced with 90s on Sunday and then more seasonable 80s for the rest of next week. Accompanying the cooldown will be a reduction in humidity levels, making a world of difference to how it feels to be outdoors.
The transition will not be smooth, however, with severe thunderstorms expected to rock a portion of the Great Lakes, mid-Atlantic and Northeast.
Episodes of snow and slippery travel are forecast prior to the departure of arctic air this weekend around Detroit.
The rain is here to stay in Seattle, as showers and cloudy skies takeover the week's weather.
Two storms will bring high winds to the United Kingdom and Ireland this weekend.
This weekend will feature snow showers and icy conditions for Minneapolis.
A new storm with snow will move in over Philadelphia Saturday, capturing the Arctic air that moved in recently. Slippery travel is forecast for a time.
A storm will drop heavy snow and disrupt travel from parts of the Midwest to a large part of the Northeast by Sunday.
Los Angeles, CA (1878)
Los Angeles 30 degrees "considered" lowest ever in December there.
Netarts, OR (2001)
80 mph wind gust.
Severe freeze: Tallahassee 10 degrees Tampa 15 degrees Appalachicola 20 degrees; all time low Lakeland 20 degrees; all time low Orlando 20 degrees; all time low Jacksonville 12 degrees Miami 35 degrees - millions in damage