Weather Forecast & Current Climate Conditions

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Bade
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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 08 Jul 2015 06:50

Himawari: http://www.japantimes.co.jp/news/2015/0 ... ZyExEbEMo1
Japan’s Himawari-8, placed in a geostationary orbit about 36,000 km above the equator, can shoot 16 different kinds of images. Its closest predecessor, the Himawari-7, produces only five, the Meteorological Agency said.

The images are also higher resolution, allowing observation of an area as small as 500 sq. meters. The new satellite generates about 50 times the volume of data compared with the output of Himawari-7, the agency said.

The Himawari-8 can take images of the entire planet — within view of its geostationary position — every 10 minutes, compared with every one hour for the previous model, and can cover all of Japan in 2.5 minute intervals, compared with 30 minutes previously, the weather agency said.

Images taken during a test run Monday clearly showed three typhoons south of the Japanese archipelago.

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 08 Jul 2015 06:53

Compare that to GOES-R capability as planned. http://www.goes-r.gov/spacesegment/abi.html
It will have the ability to continuously take an image of the entire planet, or a full disk image, every five minutes. It also has an alternative, or flex mode, which will concurrently take a full disk image every 15 minutes, an image of the continental U.S. every five minutes, and smaller, more detailed images of areas where storm activity is present, as often as every 30 seconds.

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Re: Weather Forecast & Current Climate Conditions

Postby Theo_Fidel » 28 Jul 2015 20:43

Immense floods in GJ & RJ as monsoon depression parks itself over states. IMD as usual missed this development. Not only that. No Doppler radar coverage of GJ & S. RJ so no short term localized forecasts possible. Mumbai Doppler is down.

http://www.skymetweather.com/content/we ... a-pradesh/

Torrential rain in southern parts of Rajasthan as well as West Rajasthan has inundated villages and disconnected highways. Four deaths have been reported so far, two in Jaisalmer and two in Alwar. Teams of National Disaster Relief Force (NDRF) have also reached affected areas in Rajasthan.

A well-marked low pressure area is currently present over West Rajasthan and has given widespread heavy to very heavy rain over southern and southeastern parts of the state. The system is expected to intensify into a depression which will further enhance rainfall activity over the region. This will also affect the Kutch region of Gujarat.

During last 24 hours, Barmer has received 64 mm rainfall, Jalore 79 mm, Jaisalmer 26 mm, Pali 121 mm, Chittorgarh 67 mm, and Kota 69 mm. These figures clearly indicate that the situation in the region is grim and no significant relief is likely in the next 48 hours.


Image

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Re: Weather Forecast & Current Climate Conditions

Postby ramana » 16 Aug 2015 20:04

Can some gurus do calculations on :

Jhujar wrote:Past Historical Impact of El Nino on Rainfall levels in India
In the 20th and 21st century there were 26 occurrences of El Nino – 1902-1903, 1905-1906, 1911-1912, 1914-1915, 1918-1919, 1923-1924, 1925-1926, 1930-1931, 1932-1933, 1939-1940, 1941-1942, 1951-1952, 1953-1954, 1957-1958, 1965-1966, 1969-1970, 1972-1973, 1976-1977, 1982-1983, 1986-1987, 1991-1992, 1994-1995, 1997-1998, 2002-2003, 2004-2005 and 2009-2010.

Historical data from the “Indian Institute of Tropical Meteorology” shows the following:

From 1870 to 2009, there have been 23 El Nino years when rainfall in India has been below the average. During this period, there have been only 5 El Nino years when rainfall has been above the average.From 1870 to 2009, there have been 20 La Nina years when rainfall in India has been above the average. During this period, there have been only 2 La Niña years when rainfall has been below the average.From 1870 to 2010 India had 24 major drought years – 1873, 1877, 1899, 1901, 1904, 1905, 1911, 1918, 1920, 1941, 1951, 1965, 1966, 1968, 1972, 1974, 1979, 1982, 1985, 1986, 1987, 2002, 2004, 2009.Of these 24 drought years, 13 occurred during years that coincided with El Nino (1877, 1899, 1905, 1918, 1951, 1964, 1968, 1972, 1982, 1987, 2002 and 2009). Over half the times that India has experienced drought since 1870 have been in El Nino years.

El Nino and Nini

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Re: Weather Forecast & Current Climate Conditions

Postby ramana » 18 Aug 2015 00:17

Using above data we can make some conclusions:

- India suffers from drought in 50% of El Nino years.
- India gets below average rainfall in 23/26 El Nino years.

- India gets above average rainfall in 18/20 (0.9) La Nina years
- India gets below average rainfall in 2/20 (0.1) La Nina years.

Policy recommendations.
Prepare for El Nino and welcome La Nina.

Since El Nino has 12 years cycle the Agriculture and Finance ministries should prepare by advance purchases of commodities in the years before El Nino and stockpile the supplies to avoid shortages in the country.
The farmers should be protected in El Nino years to avoid farmer suicides.

And be on the lookout for the low probability bad La Nina years also.

So on and so forth.

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Re: Weather Forecast & Current Climate Conditions

Postby UlanBatori » 18 Aug 2015 07:15

Why not combine the Weather Forecasting and Economic Forecasting threads? With the cricket Predictor-Corrector? Just a suggestion onlee...

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 02 Sep 2015 21:11

India ready with indigenous model to predict rainfall
India is finally ready with an indigenous model to predict long range and seasonal rainfall. In the next six months, the Indian Institute of Tropical Meteorology (IITM), Pune, will be able to operationalise a dynamic numerical climate model it has developed to forecast extended-range rainfall for a timescale of 15-20 days after results from the experimental stage were found to be reliable.

"For the first time, we have indigenously developed a prediction system that was not available in India. The tests have been done, the performance of the experimental model was found to be good and can be operationalised. We can now forecast rain every five days for 15-20 days especially for the agriculture sector which is the mainstay of the economy," M Rajeevan, director, IITM told HT.

India Meteorological Department (IMD), the official agency to disseminate weather forecast, will, however, validate the operationalisation of the model. At present, the IMD uses statistical model that needs lengthy calculations to make predictions of the southwest monsoon.

Scientists at IITM tasked with improving long range and seasonal scale forecasts (16 days to a season) have localised the indigenous model factoring Indian climatic conditions using the Climate Forecast System (CFS) developed in the US.

Developing the CFS-based Grand Ensemble Prediction System (CGEPS) is part of the National Monsoon Mission that was launched by the government in 2012 to improve accuracy of monsoon prediction especially since 60% agriculture in India is rain-fed.

Under the joint India-US collaboration, scientists used the National Centers for Environmental Predictions-Climate Forecast System (NCEP-CFSv2) model for monsoon prediction.

As part of the experimental version of the indigenous model, IITM has been providing forecasts for the agriculture sector to the IMD that issues advisories to the farmers over the last three years.

"The skillful and timely forecasts of intra-seasonal monsoon rainfall possess a greater potential utility for agriculture and water resource management. In the extended range, especially beyond the weather scale (two–three weeks), a single deterministic rainfall forecast is not sufficient thus the user community should also be given probabilistic forecasts that quantify the uncertainty," said Atul Kumar Sahai, project director, National Monsoon Mission.

Sahai added, "The thumb rule is that before moving from an experimental version of any forecasting system towards operational version, its skill should be evaluated in detail."

Suryachandra Rao, senior scientist at IITM, said after the monsoon mission, the model in the next phase will incorporate hydrological forecasting that will help in decisions relating to management of dam water - how much water can be released or whether the water can be used to generate hydropower.

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Re: Weather Forecast & Current Climate Conditions

Postby Theo_Fidel » 20 Sep 2015 22:18

We will have to wait and see, but there appears to be a long term shift in the SW monsoon under way. It withdraws now consistently 3-4 week later that previously. Mid to late October. 5 out of last 6 years. This year the late withdrawal is again making up for the mid season shortfalls, bringing heavy rains to Punjab, Haryana and Delhi.

In keeping with this the NE monsoon to is getting delayed in withdrawal. 2 years ago the NE monsoon was still on in the month of February!

http://www.thehindubusinessline.com/por ... 671118.ece

A sudden turnaround in the south-west monsoon, only to be expected given its truant nature, has resulted in moderate to heavy rains in the last leg of the four-month season. This has effectively brought to a halt its early withdrawal from north-west India. The withdrawal is not expected to be reversed until rains diminish in the southern peninsula. Indications are this could take the rest of the month.

So, this year too, the south-west monsoon is likely to spill over to October after a delay in its withdrawal, beyond the normal date of September 30. This is a trend that has persisted for the last few years. This makes it likely that the arrival of the north-east monsoon could get delayed over the southern peninsula.

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Re: Weather Forecast & Current Climate Conditions

Postby srin » 30 Sep 2015 23:15

http://qz.com/511792/who-won-the-battle-of-monsoon-forecasts-indian-meteorological-department-or-skymet/
“It required a lot of courage for us to come out with this kind of a prediction this year,” BP Yadav, director at the IMD, told the Economic Times newspaper. The IMD had predicted that the monsoon will be deficient due to the El Nino phenomenon, which warms the sea surface in the Pacific Ocean, leading to lower rainfall in parts of Asia.
Skymet, on the other hand, had believed that the Indian Ocean Dipole (IOD), also known as the Indian Nino—caused by the difference in sea surface temperature between parts of the western and eastern Indian Ocean—would remain positive. A positive IOD would have led to more rainfall in the Indian subcontinent.
“We were off the mark this year and we accept it with all humility,” GP Sharma, vice president at Skymet, told Quartz. “We will analyse the data and the model that we used. This year we did not have adequate data while using a new model. By the time, we had the data, it was already too late.”

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Re: Weather Forecast & Current Climate Conditions

Postby Theo_Fidel » 01 Oct 2015 09:46

^^^
I don't know. IMD was wrong 5 times of the 6 last years. Last time we had an El Nino India got normal to excess monsoon despite IMD dire warnings. What was different this time? IMD does not appear to know. Without that explanation they are just guessing and their guess went correct this time. Why? They have no explanation.

But even within that look at what all the IMD got wrong this year...
- This years grain production will be 10 million tonnes higher than last year.
- This is because India had the best recorded June monsoon rainfall. Which IMD completely missed.
- Over the monsoon too, every area got some minimal rain, there was no complete drought area .
- The monsoon revived late and is still ongoing, withdrawal is going to be late. IMD missed this too.

I don't think being right 2 out of 7 years is statistically significant....
Let them focus on getting it right a few more years in a row and I will take them more seriously...

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 01 Oct 2015 22:21

There is variance in certain forecasts of European models and US models too even in short range forecasts like Hurricanes. Just check the news from this weeks US coastal storms to hit over the weekend. Long range forecasts like monsoons are even harder no doubt.

My naive guess is the interplay between the Indian ocean dipole and El Nino is not well understood by anyone. One index seem more dominant over the other.

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Re: Weather Forecast & Current Climate Conditions

Postby manjgu » 02 Oct 2015 07:31

is there a map showing rainfall distribution this year??

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 02 Oct 2015 20:53


manjgu
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Re: Weather Forecast & Current Climate Conditions

Postby manjgu » 02 Oct 2015 20:59

map for the monsoon season i meant

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 02 Oct 2015 21:04

Image

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Re: Weather Forecast & Current Climate Conditions

Postby Theo_Fidel » 17 Oct 2015 21:05

Winds have changed direction this evening. NE monsoon has begun finally... ..heavy rain in forecast....

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Re: Weather Forecast & Current Climate Conditions

Postby member_29172 » 23 Oct 2015 20:37

WEATHER FORECAST FOR OCTOBER 24 ACROSS INDIA


Image

http://www.skymetweather.com/content/we ... for-india/
Weather systems across the country

A cyclonic circulation is over the Arabian Sea, while another cyclonic circulation is over Southwest Bay of Bengal off Sri Lanka coast.There is one more cyclonic circulation over Maldives and Lakshadweep region.

A Western Disturbance is over North Afghanistan. Under its influence an induced cyclonic circulation is expected to develop over central Pakistan and adjoining Rajasthan in next 24 hours.

Weather activity in various parts of the country

Scattered rain has been observed over Kerala and northeastern states. In last 21 hours from 8:30 am on Tuesday, Thiruvananthapuram in Kerala and Tejpur in Assam have recorded 15 mm and 13 mm of rain respectively.

Isolated weather activity in terms of rainfall has also been observed in Rajasthan, East Madhya Pradesh, Chhattisgarh and Jharkhand.

The remaining parts of the country were practically dry.

Forecast for next 24 hours

Light scattered rain is likely over Kerala, South Tamil Nadu, Assam, Meghalaya, Sikkim and Sub Himalayan West Bengal in next 24 hours.

Isolated rainfall activity is also expected over Odisha, Chhattisgarh and Jharkhand. The remaining parts of the country will observe dry weather conditions.

The night temperatures which had dropped to settle around 16 degrees in Northwest India will now rise by 2-3 degrees in next 24 to 48 hours.

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Re: Weather Forecast & Current Climate Conditions

Postby Javee » 10 Nov 2015 03:24

Solid rains across TN on last few days. Chennai got much needed rain at all the catchment areas and Neyveli received about 45cms in a day. Overall the rain gods showered their mercy as a water crisis loomed over Chennai.

Image

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Re: Weather Forecast & Current Climate Conditions

Postby Mort Walker » 11 Nov 2015 09:28

Theo_Fidel wrote:^^^
I don't know. IMD was wrong 5 times of the 6 last years. Last time we had an El Nino India got normal to excess monsoon despite IMD dire warnings. What was different this time? IMD does not appear to know. Without that explanation they are just guessing and their guess went correct this time. Why? They have no explanation.

But even within that look at what all the IMD got wrong this year...
- This years grain production will be 10 million tonnes higher than last year.
- This is because India had the best recorded June monsoon rainfall. Which IMD completely missed.
- Over the monsoon too, every area got some minimal rain, there was no complete drought area .
- The monsoon revived late and is still ongoing, withdrawal is going to be late. IMD missed this too.

I don't think being right 2 out of 7 years is statistically significant....
Let them focus on getting it right a few more years in a row and I will take them more seriously...


Let's not confuse weather forecasting with overall climate prediction. Weather forecasting in the US is also very wrong from everything from rainfall and snow by NOAA. Local TV weather forecasters are many times more correct than NOAA meteorologists who have all of the latest data.

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Re: Weather Forecast & Current Climate Conditions

Postby disha » 13 Nov 2015 23:23

Theo_Fidel wrote:^^^
I don't know. IMD was wrong 5 times of the 6 last years. Last time we had an El Nino India got normal to excess monsoon despite IMD dire warnings. What was different this time? IMD does not appear to know. Without that explanation they are just guessing and their guess went correct this time. Why? They have no explanation.


Theo you do not go through data and if you go through, do you purposely arrive at wrong conclusions?

Or do you think IMD is a sarkaari dept. and hence cannot get anything right? You form a wrong opinion and then close your eyes and assume that they are wrong since you already formed an opinion. How circular it can get?

They have been very very very right this monsoon season.

- The monsoon revived late and is still ongoing, withdrawal is going to be late. IMD missed this too.


And what about severe drought across a swath of India?

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Re: Weather Forecast & Current Climate Conditions

Postby disha » 13 Nov 2015 23:26

Alka_P wrote:WEATHER FORECAST FOR OCTOBER 24 ACROSS INDIA


Alka'ji., I find skymetweather as a sham organization. What they do is take IMD data and forecast and "simplify" and "generalize" it. Sounds like your local astrologer on TV who during summer vacation announces that you may have guests this week. For the people who really are expecting guests., they end up thinking how right the astrologer is!

If you can, please post from IMD data and skip symetweather alltogether.

I have given links in previous pages.

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Re: Weather Forecast & Current Climate Conditions

Postby Sridhar K » 15 Nov 2015 19:08

Chennai Weather from Twitterati

It is has been raining non stop in Chennai with most of the suburban areas flooded. All lakes are full and the breach is overflowing. Palar river, Adyar river are all flowing full. More rains predicted for the next 3 days and don't think Chennai can take it anymore.

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Re: Weather Forecast & Current Climate Conditions

Postby vishvak » 15 Nov 2015 21:03

Areas in and around Chennai are experiencing very heavy rains since last 7 days. Several districts have been on alert and death toll reached 59 already with more rains forecast.
link
The India Meteorological Department said in a bulletin today that the well-marked low pressure area over southwest Bay of Bengal adjoining Sri Lanka persisted and "it is likely to move west-northwestwards towards Tamil Nadu coast and would concentrate into a Depression during next 24 hours."
..
heavy to very heavy rains could be expected in the northern coastal districts of the state in the next 24 hours while there could be rain in the rest of the districts. Rains were also expected in Puducherry on Monday. The seas would be rough, he said, warning fishermen against venturing for fishing.
..
The incessant rains severely crippled normal life in the state capital Chennai, where most roads, residential areas and low-lying parts were inundated.
Subways at suburban Chennai connecting the residential areas were inundated, rendering them useless for commutation.

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Re: Weather Forecast & Current Climate Conditions

Postby Theo_Fidel » 15 Nov 2015 21:14

Chennai is flooded, my internet went down.... :( Even the milk is not available anymore... ..trains cancelled left and right...

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Re: Weather Forecast & Current Climate Conditions

Postby Gus » 15 Nov 2015 22:55

all these idiots keep throwing bags and stuff into drains and it gets clogged and the entire city is flooded by rains in just one day.

and much more to come..

i have to check if my home is dry or flooded as well..

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Re: Weather Forecast & Current Climate Conditions

Postby Lilo » 16 Nov 2015 06:38

Finally some let up.
In many places iam seeing people clearing up from ground floor & moving to higher floors - I think half meter rain fell in last 12 hours.
Now the weather radar shows clouds moving off towards northwest into andhra.

Image

Realtime forecasts of radar images of the rain bearing clouds can be found below.
http://14.139.191.205/reflectivity.htm

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Re: Weather Forecast & Current Climate Conditions

Postby SriKumar » 16 Nov 2015 07:23

Newspaper says Adayar in Chennai is flooded (it says 'boats rescuing people'). Which areas of Adayar? Is it by the river or elsewhere?

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Re: Weather Forecast & Current Climate Conditions

Postby Javee » 16 Nov 2015 08:29

This is unprecedented rain, atleast in last 10 years or so, while preparations would've helped a bit, but they couldn't have helped a whole lot. We had another 20-30cm rain across the city yesterday in about 10 hours. Expecting more rains as the cyclone will cross the coast somewhere in the Cauvery delta region. All the low lying areas are flooded, which means houses built inside lake/lakebund like Velachery, Kelambakkam, Chitlapakkam, Pallikaranai etc. The best part is Cooum and Adyar rivers are clean and almost all the garbage is out on the sea now.

For next 24hours,
Image

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Re: Weather Forecast & Current Climate Conditions

Postby member_29247 » 17 Nov 2015 11:54

BEL claims to make Doppler radars for Weather forecasts. why are we not buying and augmenting at least for major grain producing areas of country?

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Re: Weather Forecast & Current Climate Conditions

Postby Sridhar K » 17 Nov 2015 12:15

At least this time, Ramanan (IMD's infamous Chennai head) got it right with the prediction.

Some photos from another forum (gearheads)

Sholinganallur toll plaza to the infamous IT Highway (low way)
Image

http://gearheads.in/showthread.php?26776-Chennai-Rains-2015

Sathyabama Engg. college on the same IT highway
https://gearheads.in/attachment.php?attachmentid=213901&d=1447681219&thumb=1


The three major areas that are flooded are
a) Velachery - OMR belt: Decades ago, the area was a wet marshlands where the flood water overflowing from the lakes used to drain . The wet lands were converted into an IT hub with residential areas without much planning leaving this mess.

2) Suburban Chennai which had seen agricultural lands getting converted into real estates and all these areas are now flooded. The adjoining districts have faced floods because the lake bunds got breached resulting in flooding

3) Excess water from the giant Chembarambakkam lake getting drained into river Adyar causing flood along its banks.

The natural waterways and drainage system which used to carry all the rain water to nearest lake and canals have all been blocked by improper planning and encroachments. Corporation built storm water drains filled with garbage and plastics. As Theo mentioned,Chennai is flat with most areas at sea level. As alluded by Singha in the other thread relaying of roads on top of existing broken road have raised the road levels while the houses are become low. Prime example is my street. The road that runs perpendicular to my street got relaid there by making my street low lying and prone to flooding these days. This was never the case before.

Having said that Chennai corporation, local municipalities, fire services, police force, local people all did some tremendous work in regulating traffic, cleaning up drains, removing trees, restoring power, etc. Not sure about areas outside Chennai.

Airforce, Madras Regiment and NDRF have joined the relief work. Airforce Cheetah's have been airlifting people trapped in buildings. Saw two Dhruvs from the Sarang flying into Tambaram air force station today perhaps to join the rescue effort. Water level have started receding in a lot of areas.

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Re: Weather Forecast & Current Climate Conditions

Postby Lilo » 01 Dec 2015 18:24

Chennai in for another bout of flooding ?

Image

http://www.imd.gov.in/section/dwr/dynamic/dwr.htm

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Re: Weather Forecast & Current Climate Conditions

Postby Aditya_V » 01 Dec 2015 18:29

heard Adyar river in full spate, may cross saidapet and Adyar bridge

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Re: Weather Forecast & Current Climate Conditions

Postby Lilo » 01 Dec 2015 19:55

Image

Chennai rains: IMD predicts heavy rains in TN, Puducherry for next 4 days
IMD says next 4 days the heavy rains will continue!!

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Re: Weather Forecast & Current Climate Conditions

Postby Prasad » 01 Dec 2015 21:44

Half the city is under water and there is rainfall forecast for 4 more days. Fu(ked isn't even beginning to describe the state.

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Re: Weather Forecast & Current Climate Conditions

Postby SriKumar » 02 Dec 2015 05:50

How is the Mount Road area? Saidapet? Nandanam? Any flooding there?
I saw a picture of Adayar river almost touching Saidapet bridge here....

http://www.thehindu.com/2005/12/04/stor ... 950100.htm

Unbelievable!! Usually water level is 40-50 feet lower.

Added later: The above link is from 2005 and not the recent flood.

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Re: Weather Forecast & Current Climate Conditions

Postby Prasad » 02 Dec 2015 13:30

The Mt Road bridge over the river at saidapet is under water from a few pictures on twitter. And apparently chembarambakkam lake has been opened up again to release more water and its started raining heavily again.

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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 21 Dec 2015 22:58

Alarmed by Delhi air quality, Bengal trebles monitoring units
http://www.hindustantimes.com/kolkata/alarmed-by-delhi-air-quality-bengal-trebles-monitoring-units/story-4t3sRQnwHRTosVgkyt8pSP.html
“We will be increasing the number of our manual air quality monitoring stations to 72 from the existing fleet of 23. There are also plans to raise the number of automatic stations from five to eight,” Kalyan Rudra, chairman of West Bengal Pollution Control Board (WBPCB), said.

The announcement comes at a time when India has agreed at the Paris Climate summit to reduce emissions by 33% to 35% by 2030 from the 2005-level. India has also promised to create an additional carbon sink of 2.5 to 3 billion tons of CO2 through additional forest and tree cover by 2030.

“But we can ascertain how much emission we have to cut down only after we have an idea on how much pollution we are creating at present. The new stations will help us generate this data bank,” a WBPCB official said.

The stations will come up in areas like Darjeeling, Purulia, Bankura and Siuri. The state pollution control board has no pollution data from these areas.

This is in spite of scientists of the Bose Institute pointing out earlier that pollution in Darjeeling had reached alarming levels and could match that of any polluted town in the country.

Air quality monitoring in Kolkata kicked off in 1992 with the help of a limited number of monitoring stations. Different parameters, such as suspended particulate matter (SPM), nitrogen dioxide, sulphur dioxide, ozone level, carbon monoxide emissions are monitored.

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Re: Weather Forecast & Current Climate Conditions

Postby ramana » 08 Jan 2016 02:54

Wow This thread did really get the Chennai floods pre-warning. See the steady posts from Nov of the rainfall in the area.

Bade did IMD get Chennai floods right?

Also how is Theo?
We don't have any posts after the 15 Nov 15 post.

- BTW California got hit by El Nino finally on 5 Jan 2016. We had four storms systems in three days with Southern California getting the brunt of the storms which was predicted.

Bade
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Re: Weather Forecast & Current Climate Conditions

Postby Bade » 08 Jan 2016 03:04

I have not tracked the exact numbers predicted by IMD with actual amounts, but from all public channels at the time, they seem to have made the predictions right and the severity of it.

Yes, Theo is missing since the events. It is almost a month now. I too wonder why.

deejay
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Re: Weather Forecast & Current Climate Conditions

Postby deejay » 11 Jan 2016 19:31

RT has a nice time lapse view of Arctic ice melts for last 25 yrs. Also some insights on new ice vs. old ice and reduction of old ice in Arctic:

https://www.rt.com/news/328468-arctic-ice-melting-timelapse/

Arctic Ocean ice levels are in decline and now a new time lapse by US scientists is showing how large ice packs which survive more than one summer are becoming less frequent occurrences.

Each year sea ice in the Arctic Ocean builds up in the winter months and thin ice melts away during summer.

However, old, multilayered icebergs are in decline and this visualization by the National Oceanic and Atmospheric Administration (NOAA) gives some indication as to how the Arctic is “warming faster than the global average.”

Using satellite information, the video depicts the decline of nine years or older ice packs from 1990 to 2015.

The oldest packs, shown in white, can be seen to deplete dramatically around 2008 amid the darkest blue seasonal ice.

...


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