An end to the heat wave is coming to the Northeast and Midwest this weekend.
The atmospheric heat pump will continue to run at full steam this week. However, folks suffering in urban areas or with limited means to keep cool will catch a break.
Actual high temperatures in most areas continued to be in the 90s through Friday. AccuWeather.com RealFeel® temperatures will be 10 to 20 degrees higher.
Changes taking place this weekend will end the extreme heat. The pattern change should also take an edge off the humidity for a couple of days.
The high pressure system responsible for driving the heat will shift westward, allowing a cool front to make progress to the east and south.
Over the weekend, progressively less-extreme temperatures are forecast with the most noticeable drop in humidity around the Great Lakes, the interior Northeast and neighboring Canada.
The heat wave will continue Saturday over much of the mid-Atlantic and in coastal New England, before being broken Sunday.
Because of the warm waters of the Atlantic Ocean this time of year, the advance of much cooler, less humid air from the northwest may slow to a crawl and could stall over the Tennessee Valley and the southern part of mid-Atlantic. The warm ocean water sometimes acts as a natural barrier for frontal passages during July and August.
Despite this, over Virginia, the Delmarva Peninsula and over the Tennessee Valley, for example, 90- to 95-degree temperatures and high humidity are likely to be replaced with 80- to 85-degree temperatures and moderate humidity for a few days.
If the front were to move along a bit more, then the cooling and the drop in humidity could be more pronounced farther south and right along the coast.
Beyond the weekend, humidity levels are likely to creep back up throughout the region and the pattern of frequent showers and thunderstorms will soon follow. Some areas could be faced with a familiar problem from June and early July: flooding.
At this stage, it does not appear that extreme temperatures will be in a hurry to build back and stay for an extended period like it did during this week in the Northeast and in much of the Midwest.
Big changes are on the way for parts of the Western and Central states late this week and into this weekend.
Warm air is forecast to surge into much of the eastern half of the nation by the weekend and will be accompanied by heavy rain and flooding risk in some locations.
Thunderstorms in parts of the South this weekend may become strong enough to threaten lives and property.
A parade of snowstorms has been taking aim at the U.S. recently, increasing the chances for many to see a White Christmas.
Tune in weekdays at 7 a.m. EST for the latest edition of AccuWeather LIVE.
On this week's edition of AccuWeather LIVE, we'll take a look at an upcoming winter storm and how it may affect holiday travel.
Riverside RS (Yellowstone Park), WY: -59 degrees, lowest U.S. temp in December.
Valley Forge, PA (1777)
Continental Army encamped at Valley Forge on a day having "stormy winds and piecing cold" in-and-out winter followed.
Lancaster, CA (1984)
Ended up with about a foot of snow. One spot in Kern County (North of LA) had 19" of snow.