The National Weather Service has issued a heat advisory for the region on Tuesday.

The advisory is in effect from noon to 9 p.m. Today's high temp is expected to be 94 degrees, but heat indexes could reach 104 degrees or so.

The heat and humidity expected could cause heat-related illnesses for many people.

Those most at risk include the elderly, infants and children up to the age of 4, the overweight, people who work or exercise outdoors, and people with heart or respiratory problems.

For more on heat-related illnesses, click here.

Here are some tips to cool off:

• Drink plenty of fluids—at least eight cups a day.
• Take a cool bath/shower. If you don't have air conditioning, visit a mall, senior center, theater or friend's house.
• Wear lightweight clothes.

For some more cooling tips, click here. Or for a list of local swimming pools, click here. Remember that your pets get hot, too.

All county residents ages 60 and older are also welcome to visit any of the county-funded senior centers during regular hours of operation to socialize and enjoy activities while taking refuge from the heat.

The Department of Human Services Area Agency on Aging reminds residents that seven senior centers are open extended hours to provide refuge from the heat and humidity. For a list of the senior centers, click here.

More tips for keeping cool are located on the Allegheny County Department of Human Services website at www.alleghenycounty.us/dhs/cooling-tips.aspx.