The National Weather Service said that the “dangerous and record-breaking heat wave” in the western United States will extend to Southern California and peak in inland and valley areas on Sunday and Monday.
The threat of wildfires is expected to intensify from Sunday to Wednesday, and the monsoon season will begin to take shape from Tuesday. The latter is a mixed bag that brings some moisture, but may also bring lightning.
Philip Gonsalves, a meteorologist at the National Weather Service of San Diego, said that the highest temperature in the Inland Empire is expected to reach 107 to 109 degrees on Sunday, June 27.
Forecasters say that the high temperature in San Bernardino and Hemet should reach 105 degrees, while the highest temperature in the riverside area is expected to reach 101 degrees.
Rich Thompson, a meteorologist at the Los Angeles office of the National Weather Service, said that in Los Angeles County, the high temperature in the San Fernando Valley on Sunday will be between 90 degrees and 103 degrees. Thompson said the temperature in the Santa Clarita Valley should reach 107 degrees on Sunday.
Today, a dangerous and record-breaking heat wave will start from the northwestern United States southward into southern California and will continue until this week. Although the high temperatures on the west coast will subside in the middle of the week, it is expected to continue inland and extend to the Rocky Mountains. pic.twitter.com/mUcwxSih6H
Most areas of Orange County will be sheltered from the intense heat. According to Gonsalves, coastal areas are expected to maintain low-medium temperatures in the 1970s, while temperatures in inland areas will be in the mid-to-early 1980s. According to the National Weather Service, Anaheim is expected to reach a high of 89 degrees on Sunday.
Happy Saturday! Throughout the weekend and early next week, the deserts and the inland empires have been on the rise. If you spend time outdoors, make sure you stay hydrated. #CAwx pic.twitter.com/FEPMYugtMY
Gonçalves said the unusually warm temperatures are the result of the dominant high-pressure system in the Pacific Northwest. The positioning of the system is expected to change in the next few days, leading to a gradual cooling in Southern California.
Thompson said that on Monday, the high temperature is expected to drop slightly, but it will remain unusually warm. Thompson said that the temperature in the San Fernando Valley is expected to be between 95 and 102 degrees, while the temperature in the Santa Clarita Valley will reach 101 degrees.
The temperature in the Inland Empire will reach triple digits on Monday, but there will not be too many areas that exceed 105 degrees, Gonçalves said.
Gonsalves said that the relative humidity level in the Inland Empire will remain within 20% throughout the weekend, while the potential humidity level in desert areas is expected to reach single digits.
We are considering adding heat and fire weather to our inland areas (inland valleys, inland mtns and deserts). Dry air and heat, as well as the potential for substantial plume growth, will be the main issues. Report any unattended smoke/fires. #firewx #cawx pic.twitter.com/fn5s0Eqhh4
Goncalves said that from Tuesday to Thursday, the effects of the monsoon season will be felt throughout Southern California. He said the humidity from the tropics is expected to bring some afternoon showers, potential thunderstorms and increased cloud cover throughout the area. Lightning may also be at work and hit far away from clouds or raindrops. The forecaster suggested to take cover in case of hearing any thunder.
When it comes to #lightning, it’s time to clear your thinking ceiling. The monsoon that disappeared last year is likely to show up in #SoCal on Tuesday. Keep up with the forecast of potential thunderstorms and how to stay away from dangerous lightning. #CAwx #LAweather pic.twitter.com/B2iyzOX5Uq
Post time: Jun-28-2021