The National Weather Service's forecast office in San Diego has indicated an escalation in temperatures across various regions in Southern California. According to their latest report, coastal areas are expected to see a slight increase in heat compared to Friday, with inland valleys in San Diego County hitting highs between the mid-90s to 105. Orange County will also witness this uptick in temperatures, with coastal regions remaining in the mid to upper 70s but inland areas experiencing lower to mid-90s. The Inland Empire, known for its elevated temperatures during summer, can anticipate the mid-90s to 106. Those braving the heat in the lower deserts can expect a scorching 110 to 116, with mountainous elevations from 4500 to 7000 feet settling in the upper 70s to lower 90s, as per the National Weather Service San Diego.
Further understanding of this warm spell has been portrayed in an area forecast discussion, highlighting the possibility of thunderstorms in the mountains and high desert this afternoon. The potential storms could bring strong winds, lightning, and brief heavy rain. The weekend will see a dip in monsoonal moisture, lessening the chances for more thunderstorms to less than 15 percent. As the atmosphere dries out, inland regions will face hotter days and very warm nights, with an Excessive Heat Warning for the lower deserts lasting from Saturday through Monday. There is also an Excessive Heat Watch issued for other inland locations, including the Inland Empire and the Apple and Lucerne Valleys, which might be extended depending on monsoonal trends into the midweek. The National Weather Service's Forecast Discussion provided this detailed outlook.
Regarding aviation, the skies are forecasted to maintain a scattering of locally broken clouds at or above 10000 feet MSL through Saturday morning. Mountains and deserts may see cumulonimbus clouds, and after 18Z Friday, isolated to scattered thunderstorms could emerge. These possible storms, moving south to north, may pose erratic wind gusts of 30-40 knots, with storm activity expected to decline by late Saturday evening. Coastal areas should remain clear, with some low clouds lingering offshore but not likely to impact terrestrial activities.
On a nautical note, mariners have a bit of good news: No hazardous marine conditions are anticipated through Tuesday, providing some reprieve for those on the water despite the surrounding heat on land. This relatively calm period on the waves contrasts with the ongoing advisory for heat risks onshore, which is part of a larger narrative of extreme weather patterns affecting the Southwest. Observers and enthusiasts of the skies are not requested for Skywarn activation, yet they are encouraged to report any notable weather conditions, per National Weather Service guidance.
