* WHAT...Temperatures up to 99 degrees in the mountains, up to 109 in the adjacent plains, and up to 114 in the Rio Grande Valley.
* WHERE...Portions of southeast New Mexico and southwest and western Texas.
* WHEN...From 1 PM MDT /2 PM CDT/ to 8 PM MDT /9 PM CDT/ Wednesday.
* 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.