As Labor Day weekend comes into full swing, the National Weather Service San Diego brings news of weather patterns that suggest keeping an umbrella at arm's reach, especially if you find yourself in the eastern parts of San Bernardino and Riverside County mountains. On Monday, the chance of isolated thunderstorms will hover between 15-25%, so those planning outdoor activities should consider indoor alternatives. NWS San Diego reports that the weather for the rest of the holiday weekend will remain consistent with near to slightly above average temperatures before the heat kicks in later in the week.
In a detailed weather breakdown by Area Forecast Discussion, experts reveal that the high pressure over the central Rockies paired with a weak low moving across Northern California will maintain similar temperatures for Sunday and Monday, however starting Wednesday, things are set to get noticeably hotter with figures that could crest to 15 degrees above the norm, bringing heightened risk for heat stress especially for those vulnerable or those who lack access to adequate cooling. The trough to the north may serve as a temporary break from climbing temperatures today, but as it weakens, better conditions for storms emerge come Monday.
Clear skies dominate the coastal outlook in the mornings. Still, travelers should anticipate low cloud cover and potential visibility issues for morning commutes, particularly within a 10 to 15-mile band along the coast. For those concerned about flight plans, ceilings will range from 700-1000 ft MSL until the anticipated clearance around late morning. Marine conditions remain benign, with no significant hazards expected through Thursday, which is good news for those looking to hit the water during this end-of-summer stretch.
Later in the week, the interior areas of Southern California should prepare for a sizzle. With the brunt of the heat targeted inland, lake temperatures could soar, climbing toward the 110-degree mark from Lake Elsinore to Hemet. These projections are based on the current models, and the European Centre for Medium-Range Weather Forecasts' temperature readings might result in a marked increase in confidence for a hotter weather front. Coastal areas aren't spared either, with chances increasing for highs in the mid-90s for valleys just east of major corridors. Still, a subtle cooling trend may arrive next weekend, offering a respite from the midweek scorcher.
For weather enthusiasts and for those who simply like to be prepared, there's no call for Skywarn activation at this time, but reports of significant weather observations are always encouraged.
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