A heat wave is expected to overtake parts of the Southwest this week, worsening already severe drought conditions and increasing the risk for wildfires. As AccuWeather forecasters predict another bad fire season in the West, fires are already raging across Arizona, California, Nevada, New Mexico and even Colorado. The Tussock Fire continued to burn out of control early Tuesday morning in Arizona, scorching about 3,500 acres north of Phoenix. The Copper Canyon Fire also raged to the west of the city and northeast of Globe, Arizona. It has been active since last Friday, forcing officials to close parts of U.S. Highway 60 for a time. It has since reopened, according to the Arizona Department of Transportation. Phoenix received only 4% of its normal precipitation last month and has yet to have any rainfall during the month of May, allowing drought conditions to intensify. The Valley of the Sun reached 100 degrees Fahrenheit for the first time this year on Wednesday, May 5, and then reached the century mark again the next day. Temperatures have since remained above normal and will continue to do so. "A persistent northward bulge in the jet stream will continue to allow unseasonably warm air across much of the Desert Southwest through midweek," said AccuWeather Meteorologist Mary Gilbert. Later this week, Phoenix has the chance yet again for temperatures to rise above 100 degrees Thursday and Friday. "Through Wednesday, the core of the heat will be centered largely across interior California, western Nevada and portions of Arizona," Gilbert said. As a storm system bringing snow to the Rockies moves away from Colorado and Wyoming early in the week, high pressure will build across the West, according to AccuWeather Senior Meteorologist Tyler Roys. This will send temperatures soaring. "It will be back in the 90s in the Central Valley of California Tuesday through Friday of next week, some places may reach 100," Roys said. "Sacramento, California, a city that usually encounters high temperatures in the upper 70s at this time of year, is forecast to soar above 90 degrees through Thursday," Gilbert added. This could be the start of a heat wave for this area. "This stretch of unseasonable heat will work to further increase the city's departure from normal temperatures," Gilbert said. As of May 10, Sacramento is a whopping 8.4 degrees above normal for the month. Red flag warnings have been in effect across the San Joaquin Valley for days due to gusty winds and low relative humidity. Drought has accentuated fire risk as well, which the Storm Prediction Center dictates will be "critical" in the area on Monday, then "elevated" on Tuesday. This image, captured early Tuesday morning, May 11, 2021, shows red flag warnings in effect throughout the day Tuesday. (AccuWeather) "The entirety of California's San Joaquin Valley is in the midst of extreme drought, according to the U.S. Drought Monitor," said Gilbert. Reporting only 1% of the usual monthly rainfall for April, Sacramento is off to a dry start to May as well with no rainfall yet. On Monday afternoon, California Governor Newsom extended the emergency drought declaration to include 41 of the state's 58 counties. However, California is not the only state affected. "Critical fire weather conditions will return on Monday across portions of western and central New Mexico," the National Weather Service office in Albuquerque reported. Red flag warnings were also issued in the Salt Lake City area. "More 100-degree heat is likely in the deserts," Roys added. Temperatures will also be several degrees above normal across the interior Northwest and most of the Rockies later in the week. CLICK HERE FOR THE FREE ACCUWEATHER APP The storm in the Rockies will keep Denver's temperatures in the 40s and 50s for the first half of the week, but by Thursday and Friday, temperatures will soar above average into the lower 70s. "Past midweek, the jet stream will continue to push farther north each day, which will allow heat to build and spread farther north and east across more of the western United States," Gilbert said. "One area likely to not feature temperatures well above average will be along the immediate Pacific coast, where a predominantly westerly flow may keep a daily marine layer in place and temperatures closer to normal," said Roys. After having above-average temperatures since last Friday, San Francisco will ease back to normal or even slightly below average in the upper 60s by the end of the week. "While coastal areas will remain cooler than inland areas due to the influence of the Pacific Ocean, even the coast will continue to experience high temperatures 5-8 degrees above normal through Wednesday," said Gilbert. Los Angeles, for example, will have temperatures rising to the upper 70s throughout the week, peaking at 78 Wednesday and Thursday. An end to this warm streak is in sight, though. After an expected cold front late next week across the Northwest, there may be another reinforcing shot of cold air courtesy of another storm approaching the West Coast, according to Roys. Some weather models are depicting a rather potent storm that could march into the West Coast next week, while other models are not as bullish and keep the storm centered farther north across the Pacific Northwest, said Roys. Some much-needed moisture is not out of the question for California next week. Current long-range forecasts suggest Central and Northern California may even have a chance at some rainfall during this time, according to Roys. "However, based on climatology and other model guidance, our current forecast keeps moisture limited to the Northwest," Roys said. Officials ask residents of the Southwest to help prevent wildfires by ensuring campfires are completely put out, avoid dragging chains from vehicles and properly disposing of cigarettes and matches. Keep checking back on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier, Spectrum, FuboTV, Philo, and Verizon Fios.