Weather Blog

The "Puget Sound" cloud and weekly time lapses

The "Puget Sound" cloud and weekly time lapses
With all the storm craziness this weekend, here's something to get your mind off of it for a while -- sort of like our version of the TV channel for the roaring fire.

Take a look at the image above there, taken from a web camera at the University of Washington atmospheric sciences building. Looks like a typical cloud, right? But it's no ordinary cloud.

It's actually aligned exactly north-south along Puget Sound, and it's a signal that we're in a cold snap.  The cloud are being caused by a land breeze over the Sound. Since the water is relatively warmer than the frigid ground on either side of the Sound, air is rising off the water, and as more air comes in to replace it from the land, it creates a convergence zone of sorts (not *the* convergence zone, but a convergence) that causes lift and then condensing into the cloud.

You can also see it brilliantly on the visible satellite:

And also on this wind chart, taken from on board the Seattle-Bainbridge ferry Friday morning:

But what really hammers it home is by looking at it via time lapse:

You can find more of these time lapses from the UW at this link

(Thanks to Prof. Cliff Mass and Prof. Dale Durran at the UW for pointing this out to me :) )

Dr. Dale's Time Lapses

But let's not forget our Time Lapse guru, Dr. Dale Ireland and his time lapse out in Silverdale. Here's the one's you've missed since the last posting. Take a peek at the 16th and 18th and watch the snow accumulate by the unofficial measuring stick -- his Ichiro bobblehead :)

Dec. 11:

Dec. 12:

Dec. 13:

Dec. 14:

Dec. 15:

Dec. 16:

Dec. 18:

Have a safe weekend!