The Rammb Slider Thread

[b_lumenkraft]

That's weird, i don't have that Phil. It's not pre-installed for me and can't find it in the appstore. 

Are you using the Mojave operating system, it might not be on that?

https://appletoolbox.com/2013/01/how-to-use-mac-os-x-grab-utility-to-take-screenshots/#Grab_Utility_in_macOS_Mojave_and_Above

OMG cmd+shift+5 !!

No wonder i didn't find it as an app in the utility folder. Because it's a system-wide feature. Thank you so much, Phil.

[magnamentis]

some info, easist is to get "Grab" back from a backup, time machine or from any pre-mojave running machine via "copy > paste" "drag and drop etc. etc.

https://www.makeuseof.com/tag/best-gif-apps-mac/

https://itunes.apple.com/us/app/gifgrabber/id668208984?mt=12

https://itunes.apple.com/us/app/gif-brewery-by-gfycat/id1081413713?mt=12

Restore Grab from a previous macOS Time Machine backup, if available
Open Time Machine or open your backup drive’s backups.backupdb folder
If using Time Machine, go to a past snapshot from a previous macOS version like High Sierra or Sierra
If opening your backup folder, select a backup date before you updated to macOS Mojave
Locate Grab in the Utilities folder inside the Applications folder of your backup
If using Time Machine, command-click on Grab and select Restore “Grab” to… and choose your Applications > Utilities folder as the folder for the restored item
Enter your admin password, if asked
If searching your backup drive without Time Machine, locate Grab and paste it in your Mac > Applications > Utilities folder
Once complete, verify that Grab is on your Mac running macOS Mojave in the Applications > Utilities folder, open it, and conduct a test screenshot using Grab
You can also copy it from another person’s Mac running macOS Sierra or High Sierra or from their Time Machine or another backup macOS Sierra or High Sierra.

if someone wants/needs that we find ways how you can get one from me, i have 1 of 4 macs running on high sierra and can post a dropbox link here:

Via the link below you should be able to download "Grab" from my dropbox
https://www.dropbox.com/sh/chdlu6q3o0rizz8/AACExYdgybIKSJVSQyRPqYbWa?dl=0

[b_lumenkraft]

That's awesome Magnamentis. Thank you!

[magnamentis]

That's awesome Magnamentis. Thank you!

glad to see that one of the methods worked for you

BTW as a little side note:

"Grab" is 64bit hence chances are high that it will work for many years to come

Generally one can find a lot of "hidden" stuff under shortcuts and accessibility in system prefs
and last but not least one can easily create own shortcuts for often used functions.

[JayW]

Effects of southerly winds over the Bering and Chukchi are evident.
Last 3 days.

[b_lumenkraft]

Hey JayW,

thanks for posting in this thread. I'm having a favour to ask though.

Could you make the GIFs 1 pixel wider please (701px)? Since this thread is dedicated for GIFs it's a burden to even open for users with bandwidth cap or slow internet if GIFs would all autoplay and therefore auto-download. Also, the forums servers will have to work less when this thread does not force a download of multiple GIFs just by opening it.

Hope this makes sense to you. It took me some time to wrap my head around it.

[b_lumenkraft]

This is a GIF showing cracks on the north of Ellesmere Island evolving.

(Click GIF to animate)

[b_lumenkraft]

This is a GIF showing the extreme crackification at the most northern Greenland coast (north is left).

11.05. 06:06h to 15:25h UTC.

(Click GIF to animate)

[uniquorn]

Nice animation. If the ice is thick it doesn't have a lot of integrity. That must be warm water upwelling along the coast. Probably been bottom melting for a while.
maybe rotate 90deg and post on melting thread?

[b_lumenkraft]

Nice animation.

Thank you!

If the ice is thick it doesn't have a lot of integrity. That must be warm water upwelling along the coast. Probably been bottom melting for a while.

My thought exactly! I had this suspicion back in March April too when the first NS east side cracking occurred.

maybe rotate 90deg and post on melting thread?[/size]

No probs!

Edit!

[b_lumenkraft]

This is followup GIF showing the extreme crackification at the most northern Greenland coast, rotated.

Note that this crack is now reaching west all the way to the Beaufort Sea cutting through all the supposed thick ice. The sea ice has completely lost its anchor. It's drifting and cracking all over the place.

11.05. 14:34h to 12.05. 10:02h UTC.

(Click GIF to animate)

[b_lumenkraft]

This GIF is showing an interesting S-curvy pattern the floes take in hight of Hall Basin in Nares Strait.

In the upper part of the GIF, you can see an up and down movement caused by a tidal wave. The S-curve stays persistent.

Sentinel also clearly shows this 'track'.

(Click GIF to animate)

[JayW]

49 hour loop - Kara Sea - ending at 722Z, May 15, 2019 - contrast enhanced
(Requires a click)

[FishOutofWater]

The whole Arctic pack is rotating clockwise now. The ice has transform faults all around the CAA and Greenland. Faults are continuous in ice on the north of Ellesmere island on today's Aqua image.

[b_lumenkraft]

Ice follows wind.

This is a GIF showing the Laptev Sea, 20.05. 18:29h to 21.05 08:00h UTC.

(requires a click)

[oren]

b_l, thank you for this. I sometimes wish there was a way to Like a certain post more than once.

[b_lumenkraft]

Pleasing you is worth more than a thousand likes.
You are welcome Oren.

[JayW]

Okay, instead of clogging up the melting thread with my speculative post, this fits well here.  I was perusing the arctic using band M8 ("snow/cloud"), and was struck by some features on the Pacific side, these also show up in the two "snow/ice" bands. As an aside, the "I" bands are 375m resulting, "M" bands are 750m.  They are clearly features of the ice, not atmospheric, but I'm not willing to go as far as saying it is wetness, as much as I'm tempted.  The satellite definitely "sees" something, but I can't discern if it's a roughness thing, a temperature thing, or a wetness thing, or even a combination.  I've reattached the NPP satellites a bit, but haven't gained clarity.  Incidentally, the area that uniquorn referenced at 85.3N, 96.5E shows as a dark spot. (Third attachment, still image)

First attachment is north of the Chukchi. (Click it)
Link to are area http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=42&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=14903.9169921875&y=19530.083984375

Second is further north. (Click it)
Link http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=42&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=14903.9169921875&y=19530.083984375

[b_lumenkraft]

Great catch Jay!

[JayW]

Great catch Jay!

Thanks b_l, I'd like to quantify it more, but I'm very unsure on what it's picking up.

Today, I noticed a dark area emerging from beneath the clouds along the north Russian coast near the Laptev/ESS boundary.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=24&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=0&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190528054741&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=12307.0283203125&y=17794.083984375

Band M8
(Click to animate)

[b_lumenkraft]

emerging from beneath the clouds

I noticed the same with the other dark spots too.

Could it caused by rain?

[uniquorn]

worldview terra modis corrective reflectance 367 picks up the same striations on may26-28. I'm thinking peak sunlight through different layers of cloud combined with warm air temperature for a shortish time period. (click to run)

[jdallen]

worldview terra modis corrective reflectance 367 picks up the same striations on may26-28. I'm thinking peak sunlight through different layers of cloud combined with warm air temperature for a shortish time period. (click to run)

Melt ponds between pressure ridges, my 2 cents worth.

[JayW]

worldview terra modis corrective reflectance 367 picks up the same striations on may26-28. I'm thinking peak sunlight through different layers of cloud combined with warm air temperature for a shortish time period. (click to run)

Melt ponds between pressure ridges, my 2 cents worth.

That's kinda my thinking as well, although I think that the dark is wet snow, not quite liquid water. 

The pressure from the Beaufort ice getting shoved westward by the winds must've piled the ice up somewhere.  As the pressure ridges rose up, the extra weight then lowered the troughs between ridges, allowing see water to saturate the snow.

I noticed the same with the other dark spots too.

Could it caused by rain?

I'm coming around to the idea that the dark areas in band M8 are representing wet snow, and whiter areas are drier/colder snow.  I think in many of these cases, we are seeing the snowpack "ripen", meaning that it has softened to the piont it's melting so that it's surface is wet, but it's still very white, as the water can't pool on the surface yet.  That's why everything looks white in the visible bands, but picked up by the near infrared bands and displays as darker.

Today's interesting area of darkening is SE of Wrangel Island.  Here we see a storm passing through, but offering is a window through the dry slot.  A close look reveals some white bands that follow the cyclonic curvature of the storm. My interpretation is that the majority of precipitation that fell was a mixture of rain and snow, this wet down the snow (dark patches).  The whiter arcs are areas where the the precipitation came down hard enough that it was able to stay snow.  This is very common for storms where the temperatures are neat 0°C, the heavier stuff creates more cooling in the column and can drag down enough cold to keep it snow.

There's some similar patterns emerging in the Kara Sea this morning, but waiting for a few more images to load for that area.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=18&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=13818.2783203125&y=21136.111328125

Edit: added the Bremen cause color, as it picked up on the "torching" in the Chukchi where I feel the rain/snow mixture fell.

Requires a click

[b_lumenkraft]

Absolutely makes sense to me, Jay.

[JayW]

Here's the area in the Kara Sea where more darkening in band M8 is evident.  I hypothesize that the thin, low clouds produced drizzle (liquid), wetting the snow, where the thicker clouds were able to generate higher precipitation rates, and thus snow, leaving behind the white streaks.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=18&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=20190530074202&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=13081.361328125&y=13241.1669921875

Click to run

[bluice]

It looks like the white streaks are also slowly disappearing which would suggest fresh new snow from the passing storm is also starting to melt/darken/get wet. Do we have surface temperatures from the area?

New snow kills the old, as the saying goes.

[b_lumenkraft]

According to Windy, ~0˚C

[bluice]

Thanks b_l. I don't know how accurate Windy is in such a remote location, but 0 degrees should be enough to darken new snow on top of wet snow.

[b_lumenkraft]

Welcome, Idk how accurate it is either...

[b_lumenkraft]

Caught in the act i guess. 

This is in the north of the Nares Strait arch.

(Click to play)

[b_lumenkraft]

Zoomed out, it looks like this.

Arctic Ocean, north of Prinz Georg Land.

M8 Band

27.05. 03:34h to 31.05. 09:55h (UTC)

[b_lumenkraft]

Same occurrence, M10 Band, close up.

(Click to play)

[JayW]

Plenty of streaks showing NE of Utqiagvik.
Band 8, needs click.

[b_lumenkraft]

I'm having the impression the rotation picked up speed.

[JayW]

ESS showing some dark as the clouds pass in band M8.  A curious little low level circulation riding along 75°N, likely along some low level boundary also seen.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=28&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=13580.72265625&y=19252

Click

[jdallen]

ESS showing some dark as the clouds pass in band M8.  A curious little low level circulation riding along 75°N, likely along some low level boundary also seen.

I remember seeing little cyclonic features like that in 2013...14?

There was some discussion but no conclusions.

[JayW]

I remember seeing little cyclonic features like that in 2013...14?

There was some discussion but no conclusions.

I suspect they are fairly common, but exist in the lowest part of the atmosphere along frontal boundaries.  Since they are so low, higher clouds likely obscure them normally.

Speaking of swirls, some neat, fractal-like ones in the Greenland sea today.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=18&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=0&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i01&x=17694.875&y=13175.0419921875

Needs click, band I2, because it's the highest resolution.

[b_lumenkraft]

Beautiful Kelvin-Helmholtz waves.

[b_lumenkraft]

Zoomed out, it looks like this.

Arctic Ocean, north of Prinz Georg Land.

M8 Band

27.05. 03:34h to 31.05. 09:55h (UTC)

Looking at NASA Worldview (Brightness Temperature for Sea Ice (89V Ghz) GCOM-W1 / AMSR2) for this day and area, it shows warmth. Another piece in the puzzle i think.

[b_lumenkraft]

This GIF is showing Lincoln sea where the ice is driven towards the Nares Strait.

M8 band.

So is this precipitation (snowfall here?) or not? I can't explain it another way.

(Click to play)

[JayW]

80 hour loop of the Lena delta, ending June 5, 0Z

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=5&im=60&ts=1&st=0&et=0&speed=130&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_i01&x=11351.2783203125&y=16546.0283203125

Requires a click

[binntho]

Wow

[b_lumenkraft]

80 hour loop of the Lena delta, ending June 5, 0Z

Looks like this in Geo vs Natural

[b_lumenkraft]

Rammb Slider not updating. 

[JayW]

Neat cluster of mesolows moving south over the Barents, cool to see the whole thing rotating clockwise.  I flipped the image to put north, up.

http://rammb-slider.cira.colostate.edu/?sat=jpss&z=4&im=24&ts=1&st=0&et=0&speed=140&motion=loop&map=1&lat=1&opacity%5B0%5D=1&hidden%5B0%5D=0&pause=0&slider=-1&hide_controls=1&mouse_draw=0&follow_feature=0&follow_hide=0&s=rammb-slider&sec=northern_hemisphere&p%5B0%5D=band_m08&x=16124&y=12146.0556640625
Contrast enhanced for detail, click to run.

[Neven]

Megalow may be on the way...

[JayW]

Greenland, band M8.
Needs click

[oren]

Amazing animation.
So does the dark color represent wet surface or warmed surface?

[JayW]

Amazing animation.
So does the dark color represent wet surface or warmed surface?

I believe band M8 is considered to be in the near infrared spectrum, so it's possible that's is sensitive to surface temperatures, but as it is called the "cloud/snow" band, it's also possible is picking up on some property of wet snow.  Maybe some of both.  My hunch is that it's the snowpack "ripening", right at the threshold of melting.  So perhaps it's sensitive to temps near 0°C, or dampness, but I can't say for certain.  Only thing that I'm sure of, is that's is picking up on something.     sorry I can't be more informative..