As temperatures continue to soar across Southwest California, the National Weather Service San Diego, CA, has issued a heat advisory for the inland areas this week. The National Weather Service suggests that the coast will experience mid to upper 70s while the valleys will hit mid to upper 80s, with the inland empire reaching the 90s. The mountains and high deserts will not be spared, with temperatures predicted in the 80s to 100 degrees range and the low desert areas baking at 107-110 degrees.
Meanwhile, monsoon moisture is expected to abruptly bring another round of thunderstorms this afternoon in the mountains and high desert, with a slight chance continuing on Monday. The main threats from any ensuing thunderstorm development include localized flooding, frequent lightning, and gusty winds. Highs today and Monday are projected to be near seasonal normals, with inland areas preparing to endure scorching temperatures throughout the week.
The Area Forecast Discussion also warns of potential dangers associated with this weather pattern, notably the threat of dry lightning in certain regions. Consequently, a Red Flag Warning remains in effect through 9 PM for the Riverside and San Bernardino County Mountains, as well as the high desert, where thunderstorms could result in brief, critical fire weather conditions courtesy of the anticipated lightning strikes and gusty winds.
The NWS advises that things will remain more temperate for coastal dwellers and visitors, with night and morning low clouds persisting for coastal areas into the far western valleys. However, the marine outlook remains less concerning, with no hazardous conditions expected through Friday. Similarly, beaches in Orange County should brace for elevated surf and a high risk of dangerous rip currents due to a south-southwest swell arriving Tuesday through Thursday.
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