Above average temperatures will continue into this week across much of the West following temperatures more than 15 degrees above normal Sunday.
Temperatures will once again climb into the lower 90s in California's Sacramento Valley and into the upper 90s in the San Joaquin Valley.
Temperatures will top out in the low 100s from Palm Springs, Calif., for the third day in a row, as well as southwestern Arizona.
Highs in the 90s will be seen as far north as the Snake River Valley in Idaho.
These above-normal temperatures are due to an upper-level ridge that has slowly been strengthening over the West since Friday.
This upper-level ridge will not dominate all of the West however.
A system will move into the Northwest today, allowing cooler Pacific air to move into the region's coast. Ahead of this system, a few showers and thunderstorms will develop with some storms producing hail and damaging winds gusting up to 65 mph.
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As temperatures ease in the Pacific Northwest, temperatures will be on the rise elsewhere. The ridge of high pressure over the Southwest will shift eastward Monday, bringing record-challenging warmth across the Rockies and into the central and northern Plains.
On Monday, the warmest days so far this year are expected in Salt Lake City, Fresno and Las Vegas.
But more seasonable conditions will return to the Northwest by Tuesday as a disturbance from the Pacific moves over Washington, drawing in cooler Pacific air.
The upper-level ridge will hold its ground over the Southwest heading into the middle of the week, allowing above-normal temperatures to continue across the region.
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