* WHAT. Heat index values up to 107. * WHERE. Hill, Navarro, and Henderson Counties. * WHEN. Until 8 PM CDT Monday. * IMPACTS. Hot temperatures and high humidity will increase the risk for heat-related illnesses to occur, particularly for those working or participating in outdoor activities.

* WHAT. Heat index values up to 108. * WHERE. Portions of north central, northeast, and south central Texas. * WHEN. Until 8 PM CDT Monday. * IMPACTS. Hot temperatures and high humidity will increase the risk for heat-related illnesses to occur, particularly for those working or participating in outdoor activities.

* WHAT. Heat index values 105 to 108. * WHERE. Portions of north central, northeast, and south central Texas. * WHEN. Until 8 PM CDT Monday. * IMPACTS. Hot temperatures and high humidity will increase the risk for heat-related illnesses to occur, particularly for those working or participating in outdoor activities.

The National Weather Service in Fort Worth TX has issued a Flood Warning for the following rivers in Texas. Sister Grove Creek Near Blue Ridge affecting Collin County. * WHAT. Minor flooding is forecast. * WHERE. Sister Grove Creek near Blue Ridge. * WHEN. Until tomorrow morning. * IMPACTS. At 24.0 feet, minor out of bank flooding along the creek is expected. Rural roads, along with farm and ranch land near the creek, will begin to flood. * ADDITIONAL DETAILS. - At 8:00 AM CDT Sunday the stage was 22.8 feet. - Bankfull stage is 24.0 feet. - Flood stage is 24.0 feet. - Forecast. The river is expected to rise above flood stage late this morning to a crest of 25.6 feet this afternoon. It will then fall below flood stage this evening.