Ation Discussion Below,
Similar weather from yesterday will occur today as a weak trough is draped over the region. A slight increase in onshore flow on Friday will bring slightly cooler weather to areas west of the mountains with valley regions cooling up to 5 degrees. This pattern will also bring greater cloud development across the coast and far western valleys of Orange and San Diego Counties, potentially into the Inland Empire, by Friday morning. The forecast will remain pretty similar into the holiday weekend as the weak trough stays over the region with temperatures near average with weak onshore winds. Low clouds will continue to move into coastal and valley areas of Orange County and San Diego County each night and morning, some of which may venture into the edges of the Inland Empire.
By Monday, a stronger area of low pressure will move into the Pacific Northwest. Model guidance is a bit split on how far south this system will go into the first half of next week. Though no precipitation is expected for SoCal, the levels of cooling and wind will be determined by the system's position. The farther south this goes, the greater the cooling and windy weather will occur. West winds will begin to increase across the mountains and the deserts by next Monday afternoon, peaking in strength on Tuesday. NBM models show winds gusting near 30-45 MPH across most mountains and deserts. East-west oriented passes in Riverside and San Diego Counties will see the highest winds with gusts at or above 60 mph at times. The low pressure system will eventually push east sometime around next Wednesday or Thursday, bringing warmer and less windy weather by the end of next week.
A weak area of low pressure will linger over the area through Monday, bringing temperatures near to slightly above normal with night and morning clouds and fog for the coastal and western valley areas. A stronger area of low pressure moves by from the north, bringing cooler and breezier weather by the middle of next week. A subtle warming trend with less wind will occur for the latter part of next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, Updated Aviation Discussion Below,
Similar weather from yesterday will occur today as a weak trough is draped over the region. A slight increase in onshore flow on Friday will bring slightly cooler weather to areas west of the mountains with valley regions cooling up to 5 degrees. This pattern will also bring greater cloud development across the coast and far western valleys of Orange and San Diego Counties, potentially into the Inland Empire, by Friday morning. The forecast will remain pretty similar into the holiday weekend as the weak trough stays over the region with temperatures near average with weak onshore winds. Low clouds will continue to move into coastal and valley areas of Orange County and San Diego County each night and morning, some of which may venture into the edges of the Inland Empire.
By Monday, a stronger area of low pressure will move into the Pacific Northwest. Model guidance is a bit split on how far south this system will go into the first half of next week. Though no precipitation is expected for SoCal, the levels of cooling and wind will be determined by the system's position. The farther south this goes, the greater the cooling and windy weather will occur. West winds will begin to increase across the mountains and the deserts by next Monday afternoon, peaking in strength on Tuesday. Nbm models show winds gusting near 30-45 MPH across most mountains and deserts. East-west oriented passes in Riverside and San Diego Counties will see the highest winds with gusts at or above 60 mph at times. The low pressure system will eventually push east sometime around next Wednesday or Thursday, bringing warmer and less windy weather by the end of next week.
212330z, Coast/Valleys, SKC over most land areas through this early evening with some low clouds occasionally impeding the coastal areas. Low clouds will continue to develop and CIGs will expand eastward into the inland valleys mainly after 03Z with slightly higher bases (1200-1800 ft MSL). Clouds spreading northward and into western valleys overnight reaching up to 15-20 miles inland. 30% chance for cigs reaching the western/southern Inland Empire (including KONT). Clouds scattering to the coast by 17-18z Fri. and then redevelop and begin to fill back in along the coastal areas by 02-04Z Sat., with similar bases.
Otherwise, mostly clear and VFR conditions tonight and tomorrow.
No hazardous marine conditions are expected through Tuesday.
Ca, None. PZ, None.
