A trough will move into the West Coast, bringing below normal temperatures and breezy west winds across the mountains and the deserts by Thursday and Friday. The troughing pattern will stick around into the weekend and early next week with less wind and cooler than normal temperatures. Low clouds will also become more extensive west of the mountains each night into later in the week as well. A subtle warming trend is slated for the middle of next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
Crystal clear skies are seen across SoCal this afternoon. A troughing pattern is present over the West Coast as a large area of low pressure looms off of the coast of the Pacific Northwest. This trough will elongate further south over our region by Thursday into Friday. Similar temperatures will be expected tomorrow, though west winds will increase slightly over desert facing mountain passes near 20-35 MPH as the marine layer begins to build with low clouds more prevalent across the coastal areas. The main axis of the trough will pass through our region by Friday, bringing cooler weather and windier conditions the desert facing slopes into the deserts. Latest model guidance points to widespread winds 30-45 MPH by Friday afternoon and night, locally over 50 MPH in the San Gorgonio Pass. High temperatures by Friday will be generally 5 to 10 degrees below normal with highs 70-80 from the coast into the foothills and high desert.
Model guidance remains in good agreement of the trough departing and a secondary weaker trough moving into its place over the weekend. Since the gradient will relax, winds across inland areas will be lighter. High temperatures will remain similar to that of Friday with cooler than normal readings with highs in the upper 80s to near 90 degrees in the lower deserts. The trough over the area will slowly weaken, which will lead to subtle warming across the region into the middle next week with highs closer to normal.
012015z. Coast, Mostly clear skies and VFR. Areas of low clouds based around 1000-1500 feet MSL to gradually develop after 02Z this evening. While initially patchy, there is good confidence for increasing coverage throughout the night, mainly after 10z, across the coastal basin. Low confidence (20-30% chance) for patchy VIS reductions in valleys near I-15 and I-215 due to BR/HZ/FG, likely timing 11-15z. Scatter out everywhere between 15-17z Thu.
Valleys/Mountains/Deserts, Mostly clear and VFR conditions through Thursday morning.
Northwest winds Friday afternoon over outer waters near San Clemente Island will be sustained near 20 kts. Strong winds will cause for dangerous conditions for small craft. No other hazardous marine conditions are expected through Sunday.
Ca, None. PZ, None.
