UPDATE: Anticipate heat index values up to 112 degrees until Saturday evening

The National Weather Service issued an updated excessive heat warning at 1:58 p.m. on Saturday. The warning is for Montague, Cooke, Grayson, Fannin, Lamar, Young, Jack, Wise, Denton, Collin, Hunt, Delta, Hopkins, Palo Pinto, Parker, Tarrant, Dallas, Rockwall, Kaufman, Van Zandt, Rains, Hood, Somervell, Johnson, Ellis, Henderson, Bosque, Hill, Navarro, Freestone, Anderson, McLennan, Limestone and Leon counties.

For the Excessive Heat Warning Saturday, dangerously hot conditions with heat index values of 110 to 112 degrees. For the Heat Advisory Sunday, heat index values up to 109 expected for North and Eastern Central Texas until 7 p.m. this evening.

"Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities," describes the NWS.

This warning is in effect until 7 p.m.

Tips from the NWS for staying safe during a heat wave

• Stay hydrated: Keep yourself well-hydrated by drinking plenty of fluids.

• Seek shelter: Stay indoors in an air-conditioned room to keep cool.

• Check on others: Stay out of the sun, and make sure to check up on relatives and neighbors.

• Ensure child and pet safety: Do not leave young children and pets unattended in vehicles when car interiors can reach lethal temperatures in a matter of minutes.

• Exercise caution outdoors: If you work or spend time outside, take additional safety measures.

• Find the right time: Consider rescheduling strenuous activities to early morning or evening if possible.

• Recognize warning signs: Know the signs and symptoms of heat exhaustion and heat stroke.

• Dress for comfort: Wear lightweight and loose-fitting clothing to stay cool.

To reduce risk during outdoor work, the Occupational Safety and Health Administration (OSHA) recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. In an emergency, call 911.

Source: The National Weather Service