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.
Flash flooding returned to parts of South Carolina, including Columbia, as rain spread back across the Carolinas to start the weekend.
A "blob" of abnormally cold water in the North Atlantic, located near Greenland, has the potential to put enough drag on the ocean current to impact weather conditions in the years to come.
Tropical Storm Nora is headed to the Central Pacific Basin, where unusually warm waters have already led to a record 13 tropical systems this hurricane season.
A strengthening storm system will bring the threat for flooding, mudslides and severe thunderstorms across the Balkans through Sunday.
While the weekend started on a cooler note, milder air will quickly be on the rebound Sunday into Monday around New York City.
Residents from McPherson, Kansas, to Norman, Oklahoma, told the USGS that they felt the earthquake, according to the USGS website.
Early season snowfall dropped up to 12" on Webster County, WV; 9" at Staunton, VA; 1" at Dulles Airport, 0.3" in Washington, DC and 2.1" at Philadelphia. Whitened the ground throughout MD, Northern VA, Eastern WV, Eastern PA, NJ, NY and S. New England. Philadelphia broke 84 year low temperature record in mid-afternoon. Snow as far south as Richmond, VA (earliest on record). World Series Game in Baltimore postponed.
St.Augustine, FL (1989)
16.08" of rain fell.
Record Heat Wave Temp San Francisco 96 Sacramento 100 Bakersfield 101 LA Civic Center 107 Red Bluff 103 Riverside 106