LOS ANGELES (CBSLA.com) — Red flag warnings are expected to go into effect on Monday for parts of the Southland as a result of a combination hot temperatures and low humidity.

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The National Weather Service says the warning will go into effect at 6 a.m. for the mountains of Los Angeles and Ventura counties, as well as, the Santa Clarita Valley. It will expire at 6 p.m. Tuesday.

According to the NWS, a fire weather watch will also be in effect late Tuesday morning through the afternoon for the Santa Monica Mountains.

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Kaj Goldberg, reporting for CBS2 and KCAL9, says a big ridge of high pressure is beginning to expand over the Great Basin strengthening the offshore flow, heating up the atmosphere.

Daytime temperatures on Sunday are expected at about 102 for San Bernardino; 103 in Riverside; 90s in the Basin; upper 90s in the valleys and low-80s at the beaches.

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Cooler temperatures are expected by Wednesday.