A storm over eastern Russia this week will drop in along the British Columbia coast by early next week bringing a push of cool air with it, but not before the atmosphere heats up.
The overall weather pattern appears to be about to break out of its summer mode over part of North America.
A big push of cool air will end the 100-degree heat in Texas and will chase tropical humidity out of the East this weekend.
Ahead of the storm dropping southeastward across Alaska this weekend, temperatures will climb to hot levels in much of the northwest United States into Saturday.
Highs of 90 degrees are likely at least one day in Portland, and highs will be in the 80s in Seattle, perhaps setting a record on Saturday. (The record at Seattle-Tacoma Airport is 85 degrees Saturday, set last year.)
The cooler air pushing across the region Sunday and Monday will shave 20 degrees and perhaps more off temperatures in some areas. By early next week, temperatures will average 5 to 10 degrees below normal.
The change to cool weather will be accompanied by spotty showers and perhaps a locally gusty thunderstorm along the coast and in the mountains Sunday night and Monday.
Stiff winds are possible over the passes for a time as the cooler air tries to squeeze through early next week.
The gusty winds could raise wildfire concerns over the northern Rockies for a time.
Meanwhile, tropical moisture associated in part with the remnants of Tropical Storm John have eased fire concerns slightly in the San Gabriel Mountains north of Los Angeles.
Several tornadoes touched down from Oklahoma to Iowa, including near Wichita, Kan., and Oklahoma City, on Sunday.
A tornado touched down at about 2:53 p.m. CDT Monday in Moore, between Norman and Oklahoma City.
Rising temperatures and humidity across the mid-Atlantic will have it feeling like the end of June.
Slow-moving showers and storms will bring heavy rain and flooding potential.
Heavy rain returning to the northern Plains will generate a renewed flood threat for the Red River.
Keep up to date on the severe thunderstorm outbreak unfolding across the Midwest and the Plains by tracking local radars.
Memphis, TN (1983)
Freak lightning bolt strikes a man in his neck, runs down his spine, and passes out of a pocket containing keys. The bolt then struck 2 other men nearby before also hitting a tree the men were standing under at a golf course. Miraculously all three men survived.
Texas County, OK (1937)
Severe dust storm called "Black Blizzard" visibility near zero for 10 minutes.
Atlantic City, NJ (1992)
28 degrees -- coldest ever for so late in the season at the airport