Overview
- Many National Weather Service extreme-heat warnings and local heat advisories that were extended over the weekend are set to expire starting Sunday as temperatures begin a noticeable cooldown.
- The recent heat brought daytime highs often between 106°F and 115°F and unusually warm overnight lows that broke minimum-temperature records in several locations.
- Scripps Institution of Oceanography data showed near-record warm sea-bottom temperatures at La Jolla, and counties opened free cooling centers while officials cited OSHA guidance to protect outdoor workers.
- Forecasters are tracking Tropical Storm Karina and a weak Gulf disturbance for possible increases in midweek cloud cover and a small chance of light rain, though development and rainfall remain uncertain.
- The center of the heat pattern is shifting eastward, bringing hot, humid conditions and heat-index values near 100°F to parts of the Plains and Mid-Atlantic this week and maintaining hazards such as hot nights, rip currents, and localized flash flooding where storms occur.