* WHAT...Temperatures up to 100 expected.
* WHERE...Guadalupe Mountains of west Texas and Southeast New Mexico, Chinati Mountains, Marfa Plateau, Davis Mountains, Davis Mountains Foothills, Central Brewster, and Chisos Basin.
* WHEN...From noon MDT /1 PM CDT/ to 9 PM MDT /10 PM CDT/ Monday.
* IMPACTS...Hot temperatures may cause heat illnesses. Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.