The National Weather Service has issued a heat advisory in effect until 8 p.m. today. Heat index values up to 103 degrees are expected.

Hot temperatures and high humidity may cause heat illnesses.

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

Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

The latest weather forecast is:

Today: A chance of showers and thunderstorms, mainly after 4 p.m. Mostly sunny, with a high near 94. Heat index values as high as 100. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight: A slight chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms after 4 a.m. Partly cloudy, with a low around 69. West wind around 5 mph becoming calm. Chance of precipitation is 20%.

Thursday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2 p.m. Some of the storms could produce heavy rainfall. High near 80. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 61. Northeast wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Friday: Showers likely and possibly a thunderstorm, mainly before 2 p.m., then a chance of showers and thunderstorms after 2 p.m. Cloudy, with a high near 71. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night: A chance of showers before 8 p.m. Partly cloudy, with a low around 56. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Sunny, with a high near 79.

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

Sunday: Sunny, with a high near 80.

Sunday Night: Mostly clear, with a low around 56.

Monday: Mostly sunny, with a high near 83.

Monday Night: Partly cloudy, with a low around 58.

Tuesday: Partly sunny, with a high near 82.