The National Weather Service has issued extreme heat warnings for Las Vegas, warning that the city could have its earliest 100-degree day ever. The National Weather Services has predicted that Las Vegas could see its first 100 degree day in the next few days, a feat that hasn't been observed in March or April. The most dangerous heat waves are those that occur at the beginning of the season, which can lead to increased public health concerns. High-risk groups such as recreational drug users, those with high blood pressure, and the homeless are also at risk. Despite last summer's mild summer being compared to the previous year, officials have warned that the heat wave could lead to an increase in outdoor recreation in the area.