With forecasters describing this weekend's heatwave as "dangerous," "scorching," and "punishing," officials across the southwestern U.S. have warned vulnerable populations to stay hydrated and cool as many in Southern California flock to local beaches and pools to try and beat the heat.

Temperatures could reach 128 degrees in Death Valley, six degrees below the record high of 134 degrees set nearly 100 years ago.  That temperature is the highest ever recorded on Earth.

Temperatures in Las Vegas and Palm Springs soared past 115 degrees and beyond on Saturday. Downtown Los Angeles was expecting a high of 97 degrees.  

The National Weather Service issued an Excessive Heat Warning for much of the San Fernando Valley, San Gabriel Valley, Santa Clarita Valley, Santa Monica Mountains, and inland Ventura County.  That warning is in effect until 9:00PM PDT on Monday as temperatures are expected to remain dangerously high through the weekend.

In Los Angeles, the NWS expected afternoon temperatures to reach between 100 and 110 in valley areas, with nighttime temperatures staying in the 70s. The NWS is warning children, the elderly, and people with chronic ailments to avoid prolonged exposure to these conditions.  

NWS also encouraged people to avoid "strenuous outdoor activities, including hiking and mountain biking" during the warmest parts of the day. SCPR has provided "stay cool tips" for humans and pets on their website.

Fire officials across California are also concerned about the extreme fire danger with the hot, dry temperatures and are closely watching fires currently active in San Bernardino County and elsewhere.

Local agencies have opened cooling centers around Los Angeles County. People can dial 211 or view an online map for cooling center locations.

Reach Executive Producer Colin Hale here. Follow him on Twitter.