Ation DISCUSSION,
Temperatures Thursday afternoon were about 5-10 degrees higher than Wednesday afternoon in the inland valleys, mountains and deserts. This morning, the marine layer remains about 3,000 ft deep but the formation of low clouds is being disrupted and delayed by high-level moisture. With low pressure to our north and high pressure to our southeast giving us westerly flow aloft, high-level moisture from post-tropical storm Douglas is moving east over SoCal.
Through the weekend, a weak upper level disturbance will move in from the southwest bringing additional moisture from the remnants of post-tropical storm Douglas. The moisture could affect daytime and nighttime temperatures. It could suppress daytime heating and inhibit radiational cooling at night. At this time, it seems unlikely that any precipitation will result from the additional moisture but pm showers on Saturday in the San Diego County mtns cannot be ruled out.
A gradual warming trend is expected through the middle of next week as the high pressure to our southeast expands westward over SoCal. This will bring fair weather with a shallower marine layer, and temperatures are likely to first rise to a few degrees above normal in the deserts on Monday. Next Wednesday looks like it will be the warmest day, with temperatures in the low to upper 70s for the coastal areas, the 80s to low 90s for inland OC and SD County, the low to upper 90s in the IE, the 70s to 80s for the mtns, the upper 90s to about 105 in the high desert and up to 113 degrees in the low deserts. Moderate to high HeatRisk is likely in the low deserts for next Tuesday through Friday.
As the marine layer becomes shallower, night and morning low clouds and fog will become restricted to the coastal areas and western portions of the inland valleys. The marine layer and afternoon sea breezes will keep temperatures near or a few degrees above seasonal averages for the coastal areas.
Fair and seasonal weather will continue for the coming week, with a gradual warming trend. The marine layer will gradually decrease in depth with night and morning low clouds not spreading as far inland nor lasting as long into the late mornings. Subtropical moisture will bring some higher level clouds this holiday weekend, but with seasonal temperatures.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, UPDATED AVIATION DISCUSSION,
Temperatures Thursday afternoon were about 5-10 degrees higher than Wednesday afternoon in the inland valleys, mountains and deserts. This morning, the marine layer remains about 3,000 ft deep but the formation of low clouds is being disrupted and delayed by high-level moisture. With low pressure to our north and high pressure to our southeast giving us westerly flow aloft, high-level moisture from post-tropical storm Douglas is moving east over SoCal.
Through the weekend, a weak upper level disturbance will move in from the southwest bringing additional moisture from the remnants of post-tropical storm Douglas. The moisture could affect daytime and nighttime temperatures. It could suppress daytime heating and inhibit radiational cooling at night. At this time, it seems unlikely that any precipitation will result from the additional moisture but pm showers on Saturday in the San Diego County mtns cannot be ruled out.
A gradual warming trend is expected through the middle of next week as the high pressure to our southeast expands westward over SoCal. This will bring fair weather with a shallower marine layer, and temperatures are likely to first rise to a few degrees above normal in the deserts on Monday. Next Wednesday looks like it will be the warmest day, with temperatures in the low to upper 70s for the coastal areas, the 80s to low 90s for inland OC and SD County, the low to upper 90s in the IE, the 70s to 80s for the mtns, the upper 90s to about 105 in the high desert and up to 113 degrees in the low deserts. Moderate to high HeatRisk is likely in the low deserts for next Tuesday through Friday.
As the marine layer becomes shallower, night and morning low clouds and fog will become restricted to the coastal areas and western portions of the inland valleys. The marine layer and afternoon sea breezes will keep temperatures near or a few degrees above seasonal averages for the coastal areas.
031740z. Coast, Low clouds with bases 1200-1600 feet MSL redeveloping after 04Z in San Diego County and after 08Z in Orange County, though cigs may be intermittent. Scatter out of any cigs Saturday around 15-17Z.
Otherwise, Gradually increasing high clouds tonight and Saturday, thickening and lowering to 8000-15000 feet MSL Saturday morning.
No hazardous marine conditions are expected through Tuesday.
Ca, None. PZ, None.
