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141031-0746

At last, it looks like some good rain is coming to the Bay Area. This morning’s sunrise flared up with brilliant red fire, lighting up the landscape with crimson.

There was a brief photography window for about five or six minutes. What an explosion of color!

Sailors (and gardeners) take warning! It’s going to be wet soon.

Yay!

141031-0747

 

It was right out there, hanging in the sky at sunrise like a fantastic fractal tapestry. Another storm cell passing through as an early Pacific low comes ashore. Last night we had an amazing thunderstorm with some of the heaviest rain I’ve seen in years. The weather patterns have definitely shifted, at least for this week.

Ah! It was so beautiful to sip hot coffee and watch the display evolve.

You can see much more of this excellent natural show with nice big pictures over at clear display blog.

These intricate altocumulus clouds appeared around dawn on May 3 over Menlo Park.

Looking into the east, lower clouds reflected a blaze of orange while barely visible dark virga descended from the altocumulus deck:

Meanwhile in the southwest, early yellow sunlight illuminated soft, lenticular stratus, pouring over the coastal mountains:

Even though it looked like rain was imminent, the moisture just wasn’t enough to get to the ground.

Still, not long after the first pictures were taken, these dark, low scud clouds crossed the sky. On the whole, it was a satisfyingly dramatic morning:

 

Morning light reveals a freshly rain-washed world. As the clouds begin to part, the eye is delighted by happy leaves and petals spangled with brilliant rain jewels. Words cannot describe how lovely it all is, so there are few words in this post.

Enjoy!

 

Late Sunday afternoon the pale, milky cirrostratus clouds that had been filtering the sun all day thickened up and drew themselves together into patchy sprays of white. Curving tails of drifting ice crystals dropped down into the dryer air below, producing the iconic cirrus mares’ tails.

These are some of my favorite clouds. In this case, waves of moist air came pouring off the top of a cold front skirting the coast to the west. That front will probably give us some rain on Tuesday.

It was sheer good luck that I happened to glance straight up at this precise moment. It faded into view as I watched, and for less than thirty amazing seconds it glowed brightly: the rare, elusive, often fleeting circumzenithal arc!

Wow! I had seen this colorful skybow before, but never captured a photo of it. Camera ready, I snapped away. I was able to get several good shots before the arc faded out.

Circumzenithal arcs are among the brightest, most colorful of skybows. They are caused when sunlight hits flat ice crystals at a low angle, refracting the rays down and passing them out through a vertical side face. To form a CZA, the crystals must be very well aligned, almost all floating with their widest faces horizontal. This can only happen if the air flow within the cloud is very smooth and free of turbulence.

Because the sun angle must be low, CZAs only happen when the sun itself is low in the sky. Because they always happen near the zenith, where the clouds move past most quickly, they are usually very fleeting. One is lucky indeed to see it, and even luckier to get a photo.

The CZA has an even more colorful cousin, the circumhorizon arc, which can only happen when the sun is quite high in the sky. With the summer months coming, CHAs are becoming possible. If I can catch one I’ll certainly share it here!

On the whole, it was a very satisfying cloudscaped evening.

 

Oh God, the colors, the colors…

Five minutes after this was taken, the eastern sky was an even span of yellowish-pink. For dawn and sunset clouds, sun angle is absolutely critical.

For these handheld pictures with changing, difficult lighting I use a Nikon D-80 on shutter priority, and the camera self-adjusts the f-stop and ISO rating for 1/200 second. It’s amazing what good pictures it can take when it’s properly programmed. I love this happy, faithful camera!

It looks like our rainy spell is over. Storm track will likely trend north of Bay Area for a while.

The garden is calling. I hear you!