Jeremy McCreary
Well-Known Member
- Region
- USA
- City
- Carlsbad, CA
Sunny SoCal my ass! Yesterday was the first time I've seen blue sky and a sharp ocean horizon in 2-3 weeks.
That sliver of blue on the left marks a small break in our marine (air) layer — a persistant late-spring, early-summer thermal inversion blanketing the still-cool coastal waters off SoCal.
Low stratocumulus cloud decks like this one last week mark the upper marine layer. Daily sea breezes and prevailing westerlies conspire to push the layer and its clouds varying distances onshore — often for days at a time. And upper-level highs sometimes push the clouds down to the ground. Day before yesterday, that meant all-day drizzle in the low 60s.
From yesterday's ride, the marine layer cloud deck edge-on. These low clouds usually peak in May and June — hence the popular names May Gray and June Gloom. This May has certainly lived up to the gray part.
Moonlight Beach from rides in April and May.
As you can see in this NASA satellite image, this marine layer of ours is no small thing. It extends far offshore — and on this particular day, far inland as well. The big swirl, the Catalina eddy, is a persistant feature.
It helps to think about the big picture when I catch myself pining for blue sky. The marine layer's a fascinating large-scale Goldilocks process requiring just the right seasonal mix of sea surface temperatures, near-surface air temperatures, ocean current patterns, low-level wind patterns, and upper-level highs. The essential ingredients come together at this scale in only a few places worldwide.
That sliver of blue on the left marks a small break in our marine (air) layer — a persistant late-spring, early-summer thermal inversion blanketing the still-cool coastal waters off SoCal.
Low stratocumulus cloud decks like this one last week mark the upper marine layer. Daily sea breezes and prevailing westerlies conspire to push the layer and its clouds varying distances onshore — often for days at a time. And upper-level highs sometimes push the clouds down to the ground. Day before yesterday, that meant all-day drizzle in the low 60s.
From yesterday's ride, the marine layer cloud deck edge-on. These low clouds usually peak in May and June — hence the popular names May Gray and June Gloom. This May has certainly lived up to the gray part.
Moonlight Beach from rides in April and May.
As you can see in this NASA satellite image, this marine layer of ours is no small thing. It extends far offshore — and on this particular day, far inland as well. The big swirl, the Catalina eddy, is a persistant feature.
It helps to think about the big picture when I catch myself pining for blue sky. The marine layer's a fascinating large-scale Goldilocks process requiring just the right seasonal mix of sea surface temperatures, near-surface air temperatures, ocean current patterns, low-level wind patterns, and upper-level highs. The essential ingredients come together at this scale in only a few places worldwide.
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