The mercury will soar once again in the desert areas of the Southwest today as temperatures climb well above the century point. An Excessive Heat Warning has been issued from Las Vegas southward along the Colorado River to the Salton Sea, including the Imperial and Coachella Valleys. Warnings also include Phoenix. Highs may approach 110 in some areas. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening.  Wear light weight and loose fitting clothing when possible and drink plenty of water. Drink more water than usual and avoid alcohol, sugar, and caffeine. When outdoors, wear light colored clothing and a wide-brimmed hat to keep your head and body cooler. Take frequent rest breaks in shaded or air conditioned environments. Public places with air conditioning include libraries, community centers, government buildings, malls, and special refuge stations. Know the signs and symptoms of heat exhaustion and heat stroke, as heat related illnesses will be possible. The most vulnerable include those who are spending lots of time outdoors, those who do not have air conditioning, young children, the elderly, and anyone with chronic ailments. Early symptoms of a heat illness include things such as headache, thirst, and muscle cramps. Serious symptoms include weakness, skin that is cool to the touch, fast but weak pulse, nausea, and fainting. Severe symptoms include hot and red dry skin, fast and strong Pulse, sweating that has stopped, and unconsciousness. Untreated heat illness can lead to fatal heat stroke. Young children and pets should never be left unattended in vehicles under any circumstances. This is especially true during warm or hot weather when car interiors can reach lethal temperatures in a matter of minutes. For WeatherNation: Meteorologist Mace Michaels