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141209-0710

For once, all the weather models agree: We are going to get really, really wet!

As you may be able to discern from the IR view above, the jet stream is aiming right at us, sucking up gigatons of water off the warm ocean between Hawaii and the California coast. Yes, it is one of those iconic “pineapple express” patterns, and this is going to be a big one. We can expect a day of heavy rain and lots of powerful wind.

141209-0712The storm is expected to arrive in the Bay Area early Thursday morning, with rain and wind lasting all day.

If you have outdoor furniture or any other large, light objects now is the time to move them indoors or out of the wind. Check that your gutters and downspouts are clear. If there are lots of fallen leaves in the street, now is a good time to rake them into a pile away from street drains, or put them into the green bin. Better yet, spread those non-conifer leaves across your garden’s open spaces, where they will not only fertilize the earth, but protect it from erosion by heavy rain.

If you have plants in containers out under the sky, especially if they are succulents or cacti, it might be a good idea to move them to a sheltered spot where the rain will not flood them for hours and hours. Some plants might be killed or damaged by prolonged root flooding.

Trees or bushes with extended branches might be damaged by many hours of high winds. You may be able to protect some of these by tying down the long branches or covering the plants with a tarp that is tied firmly to heavy objects like cinder blocks.

If you have an open composting system, it’s a good idea to cover it with a tarp weighted with bricks or other heavy objects. While the compost will not be killed by a long, heavy rain, such a deep soaking will definitely wash many valuable nutrients down into the ground, where they will eventually be lost into the water table.

I am excited that we are finally getting a beautiful, powerful winter storm. This one looks like the biggest one in years. I can’t wait for those first drops, waking me up Thursday morning early. I hope you will enjoy the storm as much as me!

Want to know more about this coming storm? Check out this blog post from WeatherWest.com.

Below: A water vapor picture, showing how the jet stream is sucking up moisture from the ocean.

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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!

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121223-0941

Another winter storm rolls on through bringing wetness and more wetness, turning everything gray and shiny. Not a good day for gardening, but great for growing things.

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What glorious fractal ripples in the transparent water puddles!

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Gray on gray can be beautiful too.

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121219-1542

Yes, there has been a break from posts. What can I say… holidays, computer glitches, overwhelm. Sometimes you just have to back off for a while.

The changes have been good, all things considered. Deepest thanks to all of the great folks out there in this holiday time! Best wishes to all.

Where were we? We left off right in the middle of a fun mushroom walk, but before we continue that adventure let’s check in with a garden we have not visited much in recent months…

Next: back to Elizabeth’s garden!

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!