The Inland Empire will be sizzling into the weekend with temperatures predicted to be at or above 100 degrees in most locations over the next three days, prompting the National Weather Service to issue a heat advisory for the region Wednesday.
“Temperatures in the Inland Empire will peak Thursday through Saturday,” according to an NWS statement. “The combination of daytime highs in the upper 90s to 104 degrees, and overnight temperatures in the 70s, will increase the heat risk over the area.”
The advisory is in effect from noon Thursday to 8 p.m. Saturday.
“Drink plenty of fluids, stay in an air-conditioned room and stay out of the sun,” the NWS advised.
Forecasters said a ridge of high pressure crossing the southwest is influencing weather patterns. However, low-pressure troughs over Arizona and Mexico continue to drag monsoonal moisture up from the south, stirring convective activity and generating thunderstorms east of the San Gorgonio Pass and south of the Anza Valley.
Scattered thunderstorms are in the forecast for the eastern Coachella Valley, Palo Verde Valley and higher elevations in the San Bernardino National Forest over the next few days.
“Monsoonal moisture will begin to increase on Thursday, with a great influx for Friday and into the weekend,” the NWS said. “The flow of monsoonal moisture into the area will continue into next week, with chances for mostly afternoon and evening thunderstorms, mostly in the mountains and deserts.”
High temps in the Riverside metropolitan area will reach 100 degrees Thursday to Saturday, with lows in the mid-70s. In the Coachella Valley, 105 will be the average daytime high for the remainder of the week, with lows in the mid-80s, while in the Temecula Valley, the mercury will top out in the low 90s, with lows around 70.