A new data dashboard compares neighborhoods in California and shows why heatwaves can feel more intense in some places.

Large swaths of California are under heat advisories Friday and Saturday with officials cautioning against outdoor activities in triple-digit areas.

Los Angeles County is included in a heat advisory issued by the National Weather Service on Wednesday at 12:38 p.m. The advisory is in effect until 5 p.m.

Los Angeles County is under a heat advisory which was released by the National Weather Service on Saturday at 2:43 a.m. The advisory is in effect until 9 p.m.

Los Angeles County is the focus of a heat advisory released at 7:37 p.m. on Tuesday by the National Weather Service. The advisory is valid from Wednesday 11 a.m. until Thursday, May. 22 at 9 p.m.

Heat advice for Los Angeles County residents Make sure you stay hydrated avoid strenuous activity during peak hours (10 a.m.-6 p.m.) and use plenty of sunscreen while wearing light-colored clothing.

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Los Angeles County is included in a heat advisory issued by the National Weather Service on Wednesday at 12:38 p.m. The advisory is in effect until 5 p.m.