Out West, a frontal system is should lead to an injection of cool Pacific air from the Pacific Northwest to the northern High Plains as the boundary shifts slowly east and southeast.
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Abnormally cool conditions look to hang around through Saturday but rebound to seasonally warm levels by Sunday as upper level ridging builds in aloft.
Across the Plains and East, a cyclone fills while lifting slowly north and northeast through south-central Canada while its cold front slowly inches east across the Midwest and central Plains.
A Slight Risk of severe weather lies across the Southern Plains/Midwest on Friday and from the Southern Plains through the Mid-Mississippi Valley into Ohio on Sunday near and ahead of its trailing front where excessive rainfall is also possible.
Farther east, a wave of low pressure will meander along the Southeast coast tomorrow and then slowly work its way up the East Coast on Saturday while its attendant front weakens with time.
This low pressure system has been providing an influx of Atlantic moisture along the East Coast for some time, which should lead to the daily opportunities for spotty showers and thunderstorms from the Southeast to the Mid-Atlantic.
Locally heavy rainfall rates are possible, most notably in the Southeast today and Friday.
As the low begins to lift north along the front positioned off the coast Saturday afternoon, some showers and storms may pop-up across portions of the Northeast.
Today's heat has set up shop over the Great Lakes and northern New England where highs ranging 20-30 degrees above normal challenges daily record highs mainly in the mid-upper 80s; Caribou, Maine's record high temperature for Friday has already been smashed.
While a backdoor cold front enters Maine by Saturday, record heat shifts to its south into New York, Southern New England, with Texas and the Desert Southwest getting into the action as ridging aloft builds; high temperatures are forecast to climb into the 80s and 90s.
Heat looks to be prolonged in the Southwest Southern Plains into Monday as high temperatures climb into the 90s and 100s - Death Valley could exceed 110F. ■