AREAS AFFECTED : CADIZ BASIN; DEATH VALLEY NATIONAL PARK; EASTERN MOJAVE DESERT, INCLUDING THE MOJAVE NATIONAL PRESERVE; MORONGO BASIN; SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY; WESTERN MOJAVE DESERT ...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 10 AM PDT /10 AM MST/ MONDAY TO 8 PM PDT /8 PM MST/ FRIDAY... * WHAT...Dangerously hot conditions with high temperatures of 108 to 116 in many locations on Monday then increasing 2 to 3 degrees on both Tuesday and Wednesday and holding through at least Friday. Temperatures are likely to exceed 120 degrees by Wednesday in locations like the Colorado River Valley and Death Valley National Park. * WHERE...Portions of northwest Arizona, southeast California and southern Nevada. * WHEN...From Monday morning through Friday evening. * IMPACTS...Extreme heat will significantly increase the potential for heat-related illnesses, particularly for those working or participating in outdoor activities.