The National Weather Service has issued a heat advisory in effect from 11 a.m. to 8 p.m. Tuesday and Wednesday.

Heat index values up to 103 degrees are expected.

The weather service warns hot temperatures and high humidity may cause heat illnesses.

People should drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Call 9 1 1.

The latest forecast:

Today: Sunny, with a high near 93. Northeast wind around 5 mph becoming west in the afternoon.

Tonight: Clear, with a low around 69. Calm wind.

Tuesday: Sunny, with a high near 95. Heat index values as high as 100. Calm wind becoming west around 5 mph in the afternoon.

Tuesday night: Mostly clear, with a low around 71. Calm wind.

Wednesday: A chance of showers between 2 p.m. and 5 p.m., then a chance of showers and thunderstorms after 5 p.m. Mostly sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.

Thursday: A chance of showers, with thunderstorms also possible after 2 p.m. Mostly cloudy, with a high near 80. Chance of precipitation is 50%.

Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 50%.

Friday: A chance of showers before 2 p.m. Partly sunny, with a high near 77. Chance of precipitation is 30%.

Friday Night: Partly cloudy, with a low around 56.

Saturday: Sunny, with a high near 79.

Saturday Night: Mostly clear, with a low around 55.

Sunday: Sunny, with a high near 81.