Verdens ekstremt vejr...

Mikkel R skrev:
Nu vi er kommet til at se på andet af figuren kan du måske også overveje at studere de to lige linier - det er en blå og en rød - kan du finde dem?????

Går de op eller ned?? Hvor svært er det??

Sceptics argue that there have always been droughts and floods, freak weather, heatwaves and temperature extremes, but what concerns most climate scientists and observers is that the extreme weather events are occurring more frequently, their intensity is growing and the trends all suggest long-term change as greenhouse gases steadily build in the atmosphere.

Disaster management conference to tackle fallout from natural disasters, including global food crisis.

How to handle them, how to survive them, how to clean up and rebuild after them are among the many issues that will be on the agenda for the 21st World Conference on Disaster Management (WCDM), to be held in Toronto Sunday, June 19, through Wednesday.

Nearly 1,500 government officials, scientists and businesspeople from 40 different countries will participate.

Top of mind will be the expected world food crisis that all this extreme weather is already causing, driving harvests down and prices up to record levels.

"When the major networks become weather networks, and when other news becomes sort of secondary, we are facing disaster," says Lester Brown, founder and president of the Washington-based Earth Policy Institute, who will be the WCDM's opening speaker. "When you have a lot of local disasters, droughts and floods and heat waves as we're now having, reducing the food supply, then you have a global disaster."

But in most countries, where billions are living on the edge of starvation and spending up to 80 per cent of their income on food, it will mean conflict, famine, refugee crises and death.

The Arab Spring is said to have been touched off by rising food prices in Tunisia and Egypt.

"Big rain events and higher overnight lows are two things we would expect with [a] warming world," says Deke Arndt, chief of the center's Climate Monitoring Branch. Arndt's group had already documented a stunning rise in overnight low temperatures across the U.S. So are the floods and spate of other recent extreme events also examples of predictions turned into cold, hard reality?

Increasingly, the answer is yes. Scientists used to say, cautiously, that extreme weather events were "consistent" with the predictions of climate change. No more. "Now we can make the statement that particular events would not have happened the same way without global warming," says Kevin Trenberth, head of climate analysis at the National Center for Atmospheric Research (NCAR) in Boulder, Colo.

That's a profound change—the difference between predicting something and actually seeing it happen. The reason is simple: The signal of climate change is emerging from the "noise"—the huge amount of natural variability in weather.

More than 10 million people are now affected in drought-stricken areas of Djibouti, Ethiopia, Kenya, Somalia and Uganda and the situation is deteriorating....the United Nations said on Tuesday.

URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
233 PM PDT MON JUN 27 2011

..UNSEASONABLY COOL AND SHOWERY WEATHER SYSTEM TUESDAY AND
WEDNESDAY...

hvorfor dødstal i forbindelse med global opvarmning og tornadoer er stigende

Kosmos skrev:
Du fremlægger lige dokumentation for 'stigningen' ikke?

Det gør du jo selv, og...

The heat wave that is currently roasting much of the United States stands out from typical summertime heat events that we expect to occur during July and August.

First of all, the hot weather, which is associated with a sprawling area of high pressure, covers a huge expanse. Today, for example, at least 141 million people under heat advisories or warnings, according to a tweet from NOAA spokesman Justin Kenney (see video below).

Second, the heat wave has featured an extraordinary combination of high temperatures and humidity. In combination, these are known as the heat index, and during this heat wave the heat indices have shot up to levels more commonly seen in the brutally hot and humid region near the Red Sea, rather than in Minnesota and South Dakota. As meteorologist Paul Douglas reported on his Minneapolies Star Tribune blog, the heat index in Moorhead, Minn. hit a whopping 134°F yesterday, likely setting a new record for the highest heat index ever reported in Minnesota. The Twin Cities also tied its all-time heat index record, at 119°F.

The current heat wave is consistent with climate science research, which shows that as the climate warms, heat waves in general are becoming more likely. Such heat waves can be especially deadly when they feature high humidity and unusually warm overnight low temperatures that prevent people from cooling off after a hot day. On July 19 alone, 317 record warm minimum temperatures were either set or tied in the U.S., according to the National Climatic Data Center. Of those records, 84 either set or tied all time warm minimum records.

It is hard to draw conclusions about the pace of warming from a single winter, and indeed, the last decade in New York City has been one of the snowiest on record. Still, Fred Gadomski, a meteorologist at Pennsylvania State University, said that temperatures were above normal in 80 percent of the days in the past three months in the city. Strong winds from the Pacific Ocean have blanketed most of the country with unusually mild air.

"That's the distinguishing item this winter — the consistency of the mildness," Mr. Gadomski said. "If you took away that week in mid-January where it really was sort of cold, it would be the year without a winter."

Coincidentally, the federal Agriculture Department last month issued a new national map showing plant hardiness zones, which start with the coldest regions in the north and work their way south. In its first update since 1990, the map showed clear signs of things' heating up. New York City, for instance, moved into a warmer zone, going from a "warm 6" to a "cold 7," as Mr. Forrest put it.

David W. Wolfe, a professor of plant and soil ecology at Cornell University and an expert on climate change, said the temperatures this winter appeared to "represent an extreme," even within the context of climate change. But, he said, the federal climate-zone guides from 1960, 1990 and this year reveal "an extremely fast pace" of change.

"This winter, when they do the final analysis, will be close to an all-time record breaker," Dr. Wolfe said. "It's a rare event. But I think it will become less rare."

rick_uk skrev:
TV2Vejr Nyheder: Norge satte nye varmerekorder for februar (28/2-12)

The number of people who believe that the planet is warming is at its highest level since the fall of 2009. According to a survey conducted in December 2011 by the National Survey of American Public Opinion on Climate Change, 62% of Americans say they think global warming is happening. That's up 7% from last spring.

Significantly, Americans are attributing their increased belief in global warming to their (correct) perception that the planet is warming and the weather is getting more extreme. Roughly half of people who believe in global warming said that these were the primary influence.

This is certainly understandable. On the one hand, the media and key opinion-makers have all but stopped talking about the subject, so it would be hard for people to be convinced by those two sources. On the other hand, it's kind of hard to miss the extreme heat and uber-extreme weather events of the past two years.

A total of 90 tornadoes and 700 severe weather events were reported on Friday.

Tornadoes occur all year round in the US, although the strength of this week's storms was unusual for the time of year - the peak period is March to May in the southern US and later further north.

Scientists are now just beginning to understand how...

Regnrekorder og hedebølger: Svaret ligger i jetstrømmen

Artiklen handler om forbindelsen mellem disse 3 ting

As the world has warmed since the fossil-fuel revolution after World War II, Arctic temperatures have increased at more than twice the global rate

An "unprecedented" March heat wave in much of the continental United States has set or tied more than 7,000 high temperature records, and signals a warming climate, health and weather experts said on Friday.

While natural climate variability plays a major role, it is the addition of human-spurred climate change that makes this particular hot spell extraordinary, the scientists said in a telephone and web briefing.

"This heat wave is essentially unprecedented," said Heidi Cullen of the nonprofit science and communication organization Climate Central. "It's hard to grasp how massive and significant this is."

Since March 12, more than 7,000 high temperature records have been equaled or exceeded, Cullen said, citing figures from the U.S. National Climatic Data Center.

These records include daytime high temperatures and record-high low temperatures overnight, which in some cases are higher than previous record highs for the day, Cullen said.

"When low temperatures are breaking previous record highs, that's when you see this is incredibly special," she said.

"Most likely the weird weather arises from natural variation on top of a warming climate," said Michael Oppenheimer, a geoscientist at Princeton and a veteran participant in the Intergovernmental Panel on Climate Change. "What we're seeing now is not surprising in the greenhouse world ... It's just the beginning of our experience with the new atmosphere."

The duration, areal size, and intensity of the Summer in March, 2012 heat wave are simply off-scale, and the event ranks as one of North America's most extraordinary weather events in recorded history.

Temperatures in the West during this past winter have averaged near to slightly below normal. December through February, temperatures in Seattle were 1.5 degrees below average. March 1 through March 12, temperatures averaged 4 degrees below normal.

På et tidspunkt vender det, og så bliver det rigtig koldt igen. Det glæder jeg mig ikke til.

Jeg har læst at det ikke skulle ske fordi solen er blevet mere stabil

- jeg går ud fra, at der med 'rigtig koldt igen' tænkes på istid(?)

At 12.7 degree celsius , Saturday Mumbai's coldest ever March morning

Kosmos skrev:

- jeg går ud fra, at der med 'rigtig koldt igen' tænkes på istid(?)
Og jeg mindes aldrig at have hørt, at solen skulle have 'været ansvarlig' for istiderne!?

Svensmark har peget på at den kosmisk stråling har været særlig kraftig gennem istiderne på grund af jordens placering i galaksens arme, og jeg forestiller mig at den næste istid ville indfinde sig når jorden nærmer sig næste arm og dermed får mere stråling, med uændret sol effekt.

Men hvis solen i stadig stigende grad vil skærme mod strålingen må afkølingen jo udeblive. Ik? Og dermed giver det jo mening hvad der står i den gamle bog, hvadend det så er et tilfælde eller ej

- nu ved jeg jo ikke præcis, hvad der står i bogen, men hvis den er 100 år gammel, har den vel næppe omtalt indflydelsen af solens magnetfelt på den kosmiske baggrundsstråling??

Da Solen i høj Grad er angrebet af de mange Sammenstød med Mørkehobe, der drev og driver om i Verdensrummet...

Kosmos skrev:

- men dermed er vi vel så også havnet ovre i den mere æhh.... holistiske boldgade, ville jeg mene!

Executive Summary

In 2011, Americans experienced a record-breaking 14 weather and climate disasters that each caused $1 billion or more in damages, in total costing approximately $53 billion, along with incalculable loss
of human life. These disasters included severe drought in Texas and the Great Plains, Hurricane Irene along the eastern seaboard, tornadoes in the Midwest, and massive floods in the Mississippi
River Valley. In the period of January through March 2012, Americans also experienced record warm temperatures, with temperatures across the contiguous United States 6.0 degrees F above the
long-term average. In March alone, 15,292 warm temperature records were broken across the United States.

In March 2012 we conducted a nationally representative survey and found that a large majority of Americans say they personally experienced an extreme weather event or natural disaster in the past
year. A majority of Americans also say the weather in the United States is getting worse and many report that extreme weather in their own local area has become more frequent and damaging.
Further, large majorities believe that global warming made a number of recent extreme weatherevents worse.

....the kind of weird weather events that are made worse by climate change, the phenomena scientists have long been warning us that we'll be seeing much more of in a warming world. This is exactly the sort of thing we should expect as the concentration of greenhouse gases in the atmosphere continues to grow.

To climate watchers, none of this will be news. But this might be: the American public, long considered overwhelmingly apathetic about global warming, is beginning to "connect the dots." A new Yale study shows that a strong majority of Americans are now likely to acknowledge that the unusual weather events were influenced by climate change.

Climate science may still be on the fence, but the majority of Americans now believe global warming is making severe weather events worse in the United States

Despite the results, climate scientists remain somewhat mixed on global warming's impact on individual weather events. While in the last year, reports issued by climate groups like the Intergovernmental Panel on Climate Change said there may be a link between global warming and the severity of individual weather events across the globe.

However, many climate scientists concede that it could be years, if not decades, before a more firm link can be established between the two....finding a direct correlation between global warming and severe weather is tricky because there is far more variability than simply measuring the warming of the Earth. Additionally, reliable temperature data exists going back more than a century, while data on extreme weather only extends back decades.

Here are some key findings of Wednesday's report:

* Since 1961, the Midwest has had more large storms. The largest of storms, those of 3 inches or more of precipitation in a single day, increased by 103 percent through 2011. Storms of at least 2 inches but less than 3 inches in a day were up 81 percent. Storms producing 1 to 2 inches of rain showed a 34 percent increase.

* The rates for all large storms accelerated over time, with 2001 to 2010 showing the largest increases.

* The frequency of extreme storms grew so much in recent years that the first 12 years of this century included seven of the nine top years for the most extreme Midwest storms since 1961.

* With more frequent extreme storms, the average time between them has become shorter.

The report said the two worst years in the Midwest for storms of 3 inches or more per day were 2008 and 1993. Those years produced the worst floods in about 80 years, causing $16 billion and $33 billion in damage, respectively, and ranking among the nation's worst natural disasters.

"This report confirms what most of us in the Midwest have known for a while: Violent storms are becoming more frequent. And the nation's crumbling water infrastructure just makes the problem worse," said Karen Hobbs, a senior policy analyst for the National Resources Defense Council.