The new GOES-16 weather satellite has been in orbit since November 16, 2016 and some of the imagery is available in real time. It is marvelous. The spatial resolution of the imagery is higher than the current operational weather satellites, but what really is a game change is the frequency of observation, with new images every 5 minutes versus every 15 minutes for the current operational systems.
Let me show you a few samples. Let's start with a visible image around 11 AM Sunday morning centered on the Pacific Northwest. You can a north-south oriented frontal band off our coast and relatively clear skies over the Columbia Basin. But over far eastern WA and northern Idaho there is a a nice example of lines of cloud streets, with regular spacing.
Here is a blow up of the cloud streets. They occur when the atmosphere is relatively unstable at low levels with air rising in the clouds and sinking between them. The wind direction is roughly parallel to the lines.
This feature, also known as convective rolls because of the nature of atmospheric circulation, reflects an atmospheric instability that occurs when the lower atmosphere has a large change in both temperature and wind with height (see schematic below)
How about a view of a Pacific cyclone? Here is a GOES-16 image of the Friday storm approaching Vancouver Island--you can clearly see the swirl of clouds with the low.
Visible satellite imagery from weather satellites like GOES-16 show how the instability clouds over the ocean can rev up when then reach land and our terrain. This is illustrated by the situation on Saturday (below). The scattered weak showers over the Pacific deepen and expand over western Washington and Oregon, and then shrink as the descend the eastern slopes of the Cascades.
If you want to enjoy seeing GOES-16 images anywhere in the country (and for other wavelengths as well), check out the wonderful website created by the College of DuPage (found here). Enjoy.
Let me show you a few samples. Let's start with a visible image around 11 AM Sunday morning centered on the Pacific Northwest. You can a north-south oriented frontal band off our coast and relatively clear skies over the Columbia Basin. But over far eastern WA and northern Idaho there is a a nice example of lines of cloud streets, with regular spacing.
Here is a blow up of the cloud streets. They occur when the atmosphere is relatively unstable at low levels with air rising in the clouds and sinking between them. The wind direction is roughly parallel to the lines.
This feature, also known as convective rolls because of the nature of atmospheric circulation, reflects an atmospheric instability that occurs when the lower atmosphere has a large change in both temperature and wind with height (see schematic below)
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| Courtesy of the UCAR COMET Program |
The day before, as the storm approached Oregon, the region was covered by trapped mountain wave clouds, again with lines of clouds and clear areas.
But the mechanism of these clouds are completely different than the cloud streets, being associated with atmospheric waves forced by the mountains (see schematic below). For mountain wave clouds, the winds near crest level are oriented perpendicular to the cloud lines.
If you want to enjoy seeing GOES-16 images anywhere in the country (and for other wavelengths as well), check out the wonderful website created by the College of DuPage (found here). Enjoy.
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How will Northwest Weather Change Under Global Warming? Help Us Determine the Local Impacts of Climate Change
Society needs to know the regional impacts of climate change and several of us at the UW are trying to provide this information with state-of-the-art high resolution climate modeling. With Federal funding unavailable, we are experimenting with a community funding to build this effort. If you want more information or are interested in helping, please go here. The full link is: https://uw.useed.net/projects/822/home All contributions to the UW are tax deductible.
How will Northwest Weather Change Under Global Warming? Help Us Determine the Local Impacts of Climate Change
Society needs to know the regional impacts of climate change and several of us at the UW are trying to provide this information with state-of-the-art high resolution climate modeling. With Federal funding unavailable, we are experimenting with a community funding to build this effort. If you want more information or are interested in helping, please go here. The full link is: https://uw.useed.net/projects/822/home All contributions to the UW are tax deductible.
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