Record heat for March will continue for inland areas into the weekend while the marine layer with patchy night and morning low clouds and locally dense fog keeps the beaches cooler. Cooling will begin to spread inland over the weekend into early next week, but with high temperatures for some inland areas remaining more than 20 degrees above average with daily rather than monthly records for heat continuing to fall.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
(today through Saturday), High pressure aloft continues to strengthen over southern California with the heat for inland areas of southwestern California expected to peak on Friday. Weakening of high pressure aloft and onshore flow will begin to spread cooling inland over the weekend into early next week.
There is a weak coastal eddy early this morning with low clouds and fog over the inner coastal waters extending locally inland along the coast with fog locally dense. A little less coverage over land areas is expected for tonight into Friday morning with increasing coverage of night and morning low clouds and fog for coastal areas during the weekend.
High temperatures on Friday are expected to be around 30 degrees above average for the inland valleys and lower elevations of the mountains with high temperatures ranging from around 80 at the beaches to the upper 90s to 104 for the Inland Empire with 105 to 110 for the lower deserts. Cooling of high temperatures on Saturday of around 4 to 8 degrees is expected for all but the lower deserts.
(Sunday through Wednesday), High temperatures on Sunday will cool a few degrees for most areas with high temperatures still around 20 degrees above average for the mountains, deserts, and inland valleys. High temperatures on Sunday are expected to range from the mid to upper 70s near the coast to the upper 80s to mid 90s for the Inland Empire with 100 to 105 for the lower deserts. High temperatures for early next week will fluctuate within a few degrees of Sunday high temperatures each day.
Except near the coast, widespread daily records for heat will continue to be tied or broken, but with few or no new monthly records for March after Friday or Saturday.
190900z, Low clouds and fog VCNTY KSAN with CIGs 200-300 ft MSL and VIS 0.25-1 mile likely to continue through 15Z. Elsewhere, mostly clear skies and unrestricted VIS through this evening. Patchy low clouds and fog returning to the immediate coast after 03Z Friday.
Patches of fog with visibility 1 nautical mile within 20 miles of the coast this morning. Otherwise, no hazardous marine conditions are expected through Monday.
Ca, Heat Advisory until 8 PM PDT Friday for Orange County Coastal Areas-Orange County Inland Areas-Riverside County Mountains- San Bernardino County Mountains-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Coastal Areas-San Diego County Mountains-San Diego County Valleys-Santa Ana Mountains and Foothills.
Extreme Heat Warning until 8 PM PDT Saturday for Coachella Valley-San Diego County Deserts-San Gorgonio Pass near Banning.
PZ, None.
