Northern California's first heat wave of the year continues Monday with a fourth-straight day of triple-digit temperatures, but relief is on the way.

It is considered a heat wave when at least three consecutive days see temperatures at or above 100 degrees.

The KCRA 3 weather team issued Impact Days for Friday through Monday because of how the heat could affect outdoor activities and lead to health risks.

Those sensitive to heat or who spend extended amounts of time outdoors could be susceptible to heat-related illnesses.

Meteorologist Tamara Berg said Monday's forecast high for downtown Sacramento is 100 degrees. Temperatures reached 101 on Sunday and 102 on Saturday.

The peak heat period is from 2 p.m. to 6 p.m.

The Foothills could see temperatures in the upper-90s, while the Sierr

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