Orange, CA climate

[enigma99 579]

I was looking at weather underground here in the state of California and noticed something odd happening down in Villa Park currently at 11:15PM. Some areas are 78F and within walkable distance it's 18-20 degrees cooler.  Obviously some compression heating up the air, but it's it combining with marine air and thus the temp drop?

 

Edited January 17 by enigma99

[bubba 1,263]

How far away from the great Pacific Ocean? That would be the beneficent maritime effect that gives California “outdoor air conditioning” year round!

[Silas_Sancona 4,433]

On 1/17/2021 at 12:21 AM, enigma99 said:

I was looking at weather underground here in the state of California and noticed something odd happening down in Villa Park currently at 11:15PM. Some areas are 78F and within walkable distance it's 18-20 degrees cooler.  Obviously some compression heating up the air, but it's it combining with marine air and thus the temp drop?

 

Would bet this is a direct influence of terrain + the on going Santa Ana winds ..and how far the cooler marine air can penetrate under such conditions ( would influence temps in the lowest, most wind sheltered locations most easily ) Noticed the same thing over the weekend while checking on temps. across both San Diego county, and the overall L.A. Basin both at 10:30 and 11:30PM both Sat./Sunday nights.  Most dramatic were 3 Neighborhood Wx stations right on the coast around Malibu. 3 were in the 81-84F range while a couple others -within walking distance- were in the lower 70s at the same time.

Some others, directly south of where the 5 comes out of Santa Clarita into L.A., were in the upper 80s while others in more wind sheltered locations nearby  were much cooler. Same pattern was very evident around north/ east county areas of San Diego.

Obviously, urban heat island influence .. and bad station data can influence such readings also  though when it is bad data, i notice that particular station ( or two ) stand out compared to a majority of others in a given area.  Over the weekend, it was quite obvious Santa Ana related heating was what was keeping so many areas quite " hot " so late into both evenings, even right at the coast.