Weather!

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BDanielMayfield
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Re: Weather!

Postby BDanielMayfield » Tue Sep 19, 2017 7:10 pm

Starting to see sleet here :!:

Bruce, global warming and hurricane refugee
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Ann
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Re: Weather!

Postby Ann » Wed Sep 20, 2017 7:54 am

BDanielMayfield wrote:Starting to see sleet here :!:

Bruce, global warming and hurricane refugee


Good to see you here, Bruce. It's been a while.

Ann
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BDanielMayfield
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Re: Weather!

Postby BDanielMayfield » Wed Sep 20, 2017 11:13 am

Ann wrote:
BDanielMayfield wrote:Starting to see sleet here :!:

Bruce, global warming and hurricane refugee


Good to see you here, Bruce. It's been a while.

Ann


It's been a while since we've had good internet service.
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neufer
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Re: Going for the spare

Postby neufer » Thu Sep 21, 2017 8:16 pm

Art Neuendorffer

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neufer
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2017 Antarctic Ozone Hole: smallest in ~30 years!

Postby neufer » Fri Sep 22, 2017 3:28 pm

Art Neuendorffer

BDanielMayfield
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Re: Weather!

Postby BDanielMayfield » Sat Sep 23, 2017 1:57 pm

Good to see that the ban on chlorofluorocarbons is working.

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neufer
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After Hurricane Maria tore across Puerto Rico

Postby neufer » Fri Sep 29, 2017 3:56 pm

https://earthobservatory.nasa.gov/IOTD/ ... p?id=91044 wrote:
<<After Hurricane Maria tore across Puerto Rico, it quickly became clear that the destruction would pose daunting challenges for first responders. Most of the electric power grid and telecommunications network was knocked offline. Flooding, downed trees, and toppled power lines made many roads impassable. And that is exactly why teams of scientists at NASA are working long days to make sure that groups like the National Guard and the Federal Emergency Management Agency (FEMA) get high-quality satellite maps of power outages in Puerto Rico.

These before-and-after images of Puerto Rico’s nighttime lights are based on data captured by the Suomi NPP satellite. The data was acquired by the Visible Infrared Imaging Radiometer Suite (VIIRS) “day-night band,” which detects light in a range of wavelengths from green to near-infrared, including reflected moonlight, light from fires and oil wells, lightning, and emissions from cities or other human activity.

Note that these maps are not showing raw imagery of light. A team of scientists from NASA’s Goddard Space Flight Center and Marshall Space Flight Center processed and corrected the raw data to filter out stray light from the Moon, fires, airglow, and any other sources that are not electric lights. Their processing techniques also remove as much other atmospheric interference—such as dust, haze, and thin clouds—as possible.

To make the VIIRS data more useful to first responders, the Goddard team scaled the observations onto a base map that emphasizes the locations of streets and neighborhoods. The base map makes use of data collected by the Landsat, Sentinel-2, TanDEM-X, and TerraSAR-X satellites.>>
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Chris Peterson
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Re: Weather!

Postby Chris Peterson » Fri Sep 29, 2017 5:00 pm

Got a couple of centimeters of snow yesterday morning. Quite early for that. We still haven't had a freeze, but it's gotten cool enough for snow, except this time of year is usually very dry. There's still grass and flowers underneath the white.

IMG_20170928_071507p.jpg
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Fred the Cat
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Re: Weather!

Postby Fred the Cat » Sat Oct 14, 2017 5:02 am

First snow here too. At least on the surrounding mountains. Taken at the same magnification 10 minutes apart, it's interesting how towers the appears larger in the first image than the second.
IMG_9888.JPG

IMG_9892.JPG

Because of the light or perspective :?:
p.s. - Thunderbirds in town today. Whole different POV :ssmile:
IMG_9945 (2).JPG
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neufer
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Re: Weather!

Postby neufer » Mon Oct 16, 2017 7:01 pm

https://en.wikipedia.org/wiki/Hurricane_Ophelia_(2017) wrote:
<<The seventeenth tropical cyclone, fifteenth named storm, and the sixth major hurricane of the 2017 Atlantic hurricane season, Hurricane Ophelia had non-tropical origins, developing on October 9 out of a decaying cold front that had stalled over the North Atlantic in early October. After becoming a Category 2 hurricane and fluctuating in intensity for a day, Ophelia unexpectedly rapidly intensified into a major hurricane on October 14, while south of the Azores. Shortly after achieving peak intensity, Ophelia began to quickly weaken as it accelerated towards Britain and Ireland, becoming extratropical early on October 16, thus becoming the second storm of the 2017–18 UK and Ireland windstorm season.>>
https://www.washingtonpost.com/news/cap ... 64a2a6e5e0 wrote:
Former Hurricane Ophelia rocks Ireland with 100-mph wind gusts

By Jason Samenow, Washington Post, October 16 at 11:31 AM

<<Former Hurricane Ophelia plowed into southern Ireland early Monday, unleashing wind gusts as high as 119 mph, ripping off roofs and downing trees. The Irish Meteorological Service said it could be the country’s strongest storm in 50 years. The BBC reported the storm had caused at least three deaths. The Journal, an Irish news outlet, said an “unprecedented” 360,000 customers were without power. Hurricane Ophelia became a rare Category 3 storm in the eastern Atlantic on Oct. 14 roiling the oceans south of the Azores and on target to strike Ireland. (NOAA)>>
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Re: 2017 Antarctic Ozone Hole: smallest in ~30 years!

Postby Doum » Wed Oct 18, 2017 2:07 pm


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neufer
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Re: 2017 Antarctic Ozone Hole: smallest in ~30 years!

Postby neufer » Wed Oct 18, 2017 4:15 pm

Doum wrote:
Study reveals new threat to the ozone layer

http://www.spacedaily.com/reports/Study ... r_999.html

We aint out of the problem yet.

Possibly.

But it is encouraging to see that the ozone hole is responding (thus
far) exactly in accordance with our current scientific consensus.


Science works (and politics worked back when it actually believed scientists).
https://www.esrl.noaa.gov/gmd/odgi/ wrote:
:arrow: <<Past and projected future changes in reactive halogen concentrations in the atmosphere. Past concentrations are derived from NOAA measurements of both chlorine- and bromine-containing chemicals; “WMO scenarios” are from the WMO/UNEP 2014 Ozone Assessment, which are tied to NOAA observations in the past and, for the future, assume full adherence to controls on production and consumption of ODSs in the fully revised and amended Montreal Protocol (Harris and Wuebbles et al., 2014). Measured tropospheric changes are indicated with dashed curves and points, while inferred stratospheric changes are indicated as solid curves. Estimates are provided for different regions: the mid-latitude stratosphere and the Antarctic stratosphere. The down-pointing arrows represent the estimated dates that concentrations of stratospheric halogen will return to the benchmark levels present in 1980.>>
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Re: Weather!

Postby Doum » Thu Oct 19, 2017 11:41 pm

yes, that graphic lookgood. it seem to work. That's great.

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neufer
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Re: 2017 Antarctic Ozone Hole: smallest in ~30 years!

Postby neufer » Fri Nov 03, 2017 8:15 pm

https://www.livescience.com/60858-small ... ctica.html wrote:
Good News on Warming: Ozone Hole Is Smallest Since 1988
By Stephanie Pappas, Live Science Contributor | November 3, 2017

<<Higher temperatures over Antarctica this year shrank the hole in the ozone layer to the smallest it's been since 1988. Natural variability affects this healing year-to-year, however. "The Antarctic ozone hole was exceptionally weak this year," Paul Newman, chief scientist for Earth Sciences at NASA's Goddard Space Flight Center in Greenbelt, Maryland, said in a statement. "This is what we would expect to see given the weather conditions in the Antarctic stratosphere."

In the upper atmosphere, CFCs break apart, freeing chlorine to react with ozone molecules, a reaction that creates oxygen and chlorine monoxide. Similar reactions occur with bromine. Polar stratospheric clouds, which form in frigid temperatures, speed up this process by providing surfaces for the reactions to occur on. That's why the ozone hole worsens in the Southern Hemisphere winter. Higher temperatures in the stratosphere, on the other hand, allow ozone to remain more stable in the atmosphere, meaning they keep the ozone hole smaller on a year-to-year basis. This year on Sept. 11, NASA measured the maximum extent of the hole at 7.6 million square miles, 2.5 times the size of the United States. That was smaller than in 2016, when the maximum extent was 8.9 million square miles, also a below-average size. According to NASA, the average maximum extent of the ozone hole since 1991 has hovered at about 10 million square miles.

However, scientists said that two years of lower-than-usual ozone hole extent isn't a sign that the ozone layer is healing faster than expected. Instead, it's a side effect of the Antarctic vortex — a low-pressure system that rotates clockwise above the southernmost continent — undergoing a few years of instability and warmth, which prevented the proliferation of polar stratospheric clouds.

Using an instrument called a Dobson spectrophotometer, NASA researchers monitor the concentration of ozone over Antarctica on a regular basis. On Sept. 25, the concentration of ozone reached a minimum of 136 Dobson Units, which is the highest minimum since 1988. However, that concentration is still low compared with the 1960s, before man-made compounds created the ozone hole. In that decade, ozone concentrations over Antarctica were between 250 and 350 Dobson Units.>>
Art Neuendorffer

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Ann
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Re: Weather!

Postby Ann » Tue Nov 21, 2017 1:08 pm

Snow in Stockholm.
Photo: Ingemar Holst.
It's snowing in Stockholm again, which puts an evil grin on my face.

I just hope that karma won't come back to bite me.

More precisely, I hope this winter isn't going to be a long cold one with a lot of snow. :brr:

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neufer
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Re: Weather!

Postby neufer » Tue Nov 28, 2017 2:44 pm

Click to play embedded YouTube video.
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bystander
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Re: Weather!

Postby bystander » Tue Nov 28, 2017 3:00 pm

neufer wrote:
Click to play embedded YouTube video.

Wow, they ought to make that an APOD!
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neufer
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Re: Weather!

Postby neufer » Tue Nov 28, 2017 5:14 pm

bystander wrote:
Wow, they ought to make that an APOD!
https://www.etymonline.com/word/snark wrote:
snark (n.) imaginary animal, coined 1876 by Lewis Carroll in "The Hunting of the Snark."

Meaning "caustic, opinionated, and critical rhetoric" is from c.2002, probably from snarky and not directly related, if at all, to Lewis Carroll's use of snark.

snarky (adj.) "irritable, short-tempered," 1906, from snark (v.) "to find fault with, nag" (1882), literally "to snort" (1866), from an imitative source akin to Low German snarken, North Frisian snarke, Swedish snarka; and compare snarl (v.2), sneer (v.). Back-formation snark (n.) "caustic, opinionated, and critical rhetoric" is from c.2002.
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