A heat advisory remains in effect until 9 pm Saturday.
Afternoon temperatures at or above 100 degrees with heat index values from 105 to 110 can be expected today and tomorrow.  Overnight low temperatures will remain in the mid 70s to near 80 degrees.
Persons involved in vigorous outdoor activities are urged to take frequent breaks and drink plenty of water. Wear loose fitting and light-colored clothing. Be sure to check on persons with health problems and the elderly…as they are the most susceptible to heat exhaustion and heat stroke. Never leave young children or pets in an enclosed vehicle…even for a short time…as temperatures can quickly rise to life threatening levels.
There is a slight chance for thunderstorms through tonight generally east of a Bowie…Waco…Cameron line. The very warm temperatures will result in an environment conducive for very strong…to possibly damaging downburst winds with any collapsing storms. Cloud-to-ground lightning and small hail are the other hazards.

The Texas commission on environmental quality (TCEQ) has issued a level orange air pollution watch for the Dallas-Fort Worth area for Friday, August 6, 2010.
Atmospheric conditions are expected to be favorable for producing high levels of ozone air pollution in the area on Friday. Ozone levels could reach the level orange “unhealthy for sensitive groups” category.  Elevated concentrations of ozone can act as a lung irritant.  Individuals with chronic lung disease, such as asthma and emphysema, as well as the elderly and young children, are particularly sensitive to ozone and should attempt to avoid exposure.  To avoid exposure, minimize exertion outdoors during the mid-day to early evening hours or stay indoors in an air-conditioned room during this time.
For more information on ozone, visit the tceq ozone data page: http://www.tceq.state.tx.us/nav/data/ozone_data.html