High temperatures for the next week will generally range from a few degrees above average near the coast to 5 to 10 degrees above average for the mountains and deserts with some slight day to day differences. Moderate HeatRisk will continue for the deserts through next Wednesday. Marine layer low clouds will spread into portions of the western valleys during the nights and early mornings, with day-to-day variations. There is a slight chance of showers near the mountains for this afternoon.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, New Aviation Discussion,
(today through Sunday), The marine layer is around 1500 to 2000 feet deep with the late Thursday afternoon NKX sounding showing moist layers in the mid levels between 500 and 700 mb and at higher levels between 200 and 300 mb.
A weak upper level low pressure system continues to move slowly westward and away from the coast of northern and central Baja. Satellite imagery shows high level clouds and some mid level clouds extend northeastward from this upper low and across portions of southern California. The mid clouds are mostly across San Diego County and northern Baja.
Satellite imagery also shows widespread low clouds covering most of the southern California bight. However, with the mid and high level moisture, there has been disruption to the low clouds along the coast of Orange and San Diego Counties. The low clouds should eventually return to some coastal areas and possibly portions of the western valleys by around sunrise this morning.
With the mid level moisture and clouds, there remains the possibility of virga or a few showers with limited rainfall for this afternoon for the mountains and deserts. NBM thunder probabilities for this afternoon are 5 to less than 10 percent across San Diego and Riverside Counties and the San Bernardino Mountains and adjacent deserts.
High temperatures for the coast and valleys will cool a few degrees for the weekend while the deserts warm a few degrees. High temperatures for today will be 5 to locally 10 degrees above average with Sunday high temperatures ranging from a few degrees above average for the coast and valleys to 4 to 8 degrees above average for the deserts. Moderate HeatRisk will continue for the deserts through the weekend into the middle of next week.
Several records for warmest daily minimum temperatures are likely to be tied or broken each day for today through Sunday, mainly for the coast and mountains, though there could also be a few for the deserts and inland valleys.
(Monday through Thursday), There will be slight warming of high temperatures through Tuesday, then cooling of a few degrees per day for Wednesday and Thursday. High temperatures on Tuesday will range from near to a few degrees above average near the coast to 5 to 10 degrees above average for the mountains and deserts. With the cooling on Wednesday and Thursday, High temperatures on Thursday will still be a few degrees above average for the deserts, while cooling to around 5 degrees below average for the valleys.
High temperatures on Tuesday will range from the lower to mid 70s near the coast to the mid 80s to mid 90s for the Inland Empire with 109 to 113 for the lower deserts. High temperatures on Thursday will range from the lower to mid 70s near the coast to the 80s for the Inland Empire with 104 to 108 for the lower deserts. Moderate HeatRisk will continue for the deserts through Wednesday.
121745z, Coast/Western Valleys, Low clouds have cleared the coast with bands of mid/high level clouds moving through AOA 20000 ft MSL. Low clouds return after 03Z along the coast with bases 800-1200 ft MSL, pushing further inland (around 15 miles) after 09Z.
Mountains/Deserts, VFR conditions are expected through the TAF period with High clouds AOA 20000 feet MSL. High clouds will lower a bit into the afternoon, especially over mountain areas this afternoon. Cumulus AOA 10000 ft MSL over the mountains may produce very isolated -SHRA. Mostly clear skies expected after 14Z Saturday.
No hazardous marine conditions are expected through Tuesday.
Ca, None. PZ, None.
