Cooler air will filter into the Pacific Northwest and in the Northern Plains as a cold front slowly advances over the next couple of days.
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Elsewhere the hot conditions are expected to stick around.
To the South, southwesterly flow will transport ample Monsoonal moisture northward which will increase the possibility for showers and thunderstorms to trigger from the Great Basin to the High Plains.
The advancing cold front is expected to trigger thunderstorms across the Northern Plains today before reaching into the upper Midwest on Saturday.
Some of these storms may become more organized over portions of the Upper Midwest by Saturday; strong, possibly severe thunderstorms, along with areas of heavy rainfall may setup in proximity to a developing wave of surface low pressure.
Meanwhile, monsoonal showers and thunderstorms will remain the rule farther south over the Great Basin and the Four Corners region with a tendency for the activities to shift eastward across the central and southern Rockies by the weekend.
Over the Northern Rockies into the High Plains, monsoonal moisture drawn northward ahead of the cool air mass will be interacting with the associated front to result in some locally heavy rainfall late tonight into Saturday.
A sprawling, slow moving frontal boundary across the eastern third of the county will remain the focus for convection and possibly heavy rainfall.
The front is expected to lift northward toward New England as a warm front, however, scattered thunderstorms are expected to remain across much of the eastern U.S.
Heat is expected to spread across the northern tier ahead of the cool air mass as high temperatures soar into the upper 90s to low 100s.
Although there will be an increase in cloud cover and chances for rain that will help limit the max temperature potential, there are locations that may tie or set new daily records.
The heat ahead of the cold front along with windy and dry conditions will contribute to fire concerns, particularly for parts of the West.
Red Flag warnings are in effect for portions of Oregon and northern California but are expected to ease with the arrival of the cooler airmass. ■
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