As heat reaches its peak in the East through Thursday, the clock is ticking on the arrival of cooler, less humid air for the region.
The pattern of cool air rolling out of Canada during recent weeks will soon resume.
Just when you thought summer was here to stay, a cool front will push into the Appalachians and New England during Friday, then to the mid-Atlantic coast by Saturday.
During the transition, thunderstorms are likely to erupt.
While far from a blast of cool air, the first push from Canada will take the edge off the heat and replace dangerous conditions with levels that are much less troublesome. High temperatures in the 90s to near 100 will be replaced by high temperatures in the 80s.
However, the atmosphere will not stop there. More air will flow southeastward from central Canada, and by the middle of next week, temperatures could be running 10 to 15 degrees below normal. This would put highs in the 60s to lower 70s.
Some cooler air will also spill into part of the South next week.
The jet stream, which is a belt of strong steering winds high in the atmosphere, is forecast to take another big southward dip into the Great Lakes and Eastern states next week.
If it rains in some areas during part of the pattern, which is possible in part of the Appalachians and Atlantic Seaboard, daytime highs could be even more off the mark.
The sunny versus rainy weather during the first part of next week may be contingent on the movement of a tropical system, which has yet to be born in the Gulf of Mexico or western Caribbean.
The feature could draw rain and humid conditions up the coast for a time, followed by windy, chilly air from the northwest.
At any rate, after the blast of heat moves away late this week, there is no sign of 95- to 100-degree air returning any time soon for the region.
The first and middle phases of the pattern are not likely to bring much rain to needy areas of the Ohio and middle Mississippi valleys. It is possible that moisture will begin to feed into these areas late in the month from the northern Rockies and central Plains.
Until the first front arrives, tens of millions of people will continue to swelter in a dangerous blast of high heat and humidity that few are accustomed to.
Several storms will bring periods of rain and gusty winds to the west coast of the United States next week with the potential for one of these to reach Southern California.
Colder weather, and in some cases, a taste of winter with snow will continue to invade the northeastern United States this weekend.
Dry weather set to dominate the southern United States into November will only worsen the already extreme drought conditions.
The changing of the seasons will bring beneficial rainfall to northern Brazil, a region that has experienced severe drought over the past several years.
Damaging storms pounded the Pacific Northwest, while two powerful typhoons struck the Philippines within a four-day span.
Typhoon Haima made a second landfall in southeast China on Friday after leaving at least 13 dead in the northern Philippines.
New England (1761)
Southeast New England Hurricane -- "most violent in 30 years"-- thousands of trees uprooted in MA and RI blocking roads.
Newbury, VT (1843)
12 inches of snow.
East Coast, USA (1878)
"Gale of '78;" hurricane center over Richmond, VA. Washington, DC. barometer reading of 28.78"/975 mb. Cape May had winds of 84 mph from the SE. Highest tide ever for the Delaware River. Winds 100 mph at Wilmington, DE. Severe damage in Philadelphia.