From Harlingen, Texas: High temperatures and humidity are expected to combine, driving up the heat index. This will lead to extremely hot conditions, with the heat index reaching as high as 115 in some areas during the hottest part of the day.

The National Weather Service has taken action in response to these conditions. An advisory has been issued, warning of the extreme heat.

Further information is available from the National Weather Service, which issued the advisory for inland areas of the Rio Grande Valley.