Near average temperatures through the weekend with below average temperatures expected next week. Low clouds will spread into the valleys each night and morning, lingering into the afternoon at times along the coast. Increased westerly winds expected Tuesday through potentially Thursday for the mountains and deserts. Patchy drizzle or light rain possible west of the mountains overnight Tuesday into Wednesday morning.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
High temperatures today are forecast to be within 5 degrees of normal. Low clouds had filled in the coastal basin overnight and are clearing to the coast as of 11 AM. While some coastal areas may clear completely, others will only see partial and intermittent clearing. A weak area of low pressure will approach Southern California Sunday which will increase onshore flow, resulting in widespread low cloud coverage with an increased chance of limited clearing along the coast Sunday afternoon. The low will slowly move east Monday afternoon, which will maintain a deeper marine layer and cloudier skies into the afternoon. Additionally, highs on Monday are expected to fall below average for areas west of the mountains and to within 3 degrees of average for the deserts.
A more robust area of low pressure is expected to dig south into the Pacific Northwest Tuesday. This will maintain cloudier and cooler weather with widespread below average temperatures. Additionally, winds are expected to increase over the mountains and into the deserts. Strongest winds are expected on Tuesday afternoon into Wednesday morning, with wind gusts 35 to 45 mph, local gusts to 60 mph in wind prone locations. Winds will weaken slightly into Wednesday but remain elevated into Thursday morning. Areas of patchy drizzle or light rain are possible Tuesday night into Wednesday west of the mountains. Ensemble members of both the ECMWF and GEFS show light precipitation, with more members of the ECMWF on board compared to the GEFS. Regardless, any rainfall that accumulates is expected to be less than 0.10".
Most ensemble guidance keeps the low over the Great Basin through Thursday, which would maintain below average conditions but allow for a few degrees of warming. By Friday, the low is expected to be weaker and slightly further east which would bring an additional few degrees of warming. The marine layer will likely become shallower for the end of next week.
231800z, Coast/Valleys, Low clouds around 2500ft MSL are quickly clearing from inland areas and retreating to the coast. A few low clouds will linger over coastal areas throughout the day, pushing back in after 00-01Z Sunday. Bases will be similar as they were this morning with OVC/BKN clouds 1500-2500ft MSL, filling into the inland valleys after 03-05Z and into the Inland Empire after 05-07Z. Locally reduced VIS 3-5SM in far inland valleys, and 0-3SM where clouds intersect higher terrain. Inland valleys will begin to see scattering out after 16Z Sunday, with coastal locations scattering after 17-18Z Sunday.
Otherwise, mostly clear and VFR conditions through the period.
No hazardous marine conditions are expected through Thursday.
Ca, None. PZ, None.
