"In a time of universal deceit telling the truth is a revolutionary act." -George Orwell

Posts Tagged ‘Extreme Cold’

Weather Extremes Rise As Planet Gets Hotter & Colder

In Uncategorized on January 6, 2015 at 11:49 pm

An island left high and dry in the English Lake District when water levels fell drastically during the 2003 heat wave. Photo by Chris Tomlinson via Wikimedia Commons

Oldspeak: “In the wake of yet another extreme temperature fluctuation, (2 days ago, it was a spring-like 55 degrees  here in New York, today it was snowing and in the 20’s) This sounds about right. Expect this trend to continue to worsen.” -OSJ

By Tim Radford @ Climate News Network:

-Scientists predict that lethal heat waves in Europe, and ice storms and big freezes across the globe, could become regular events if greenhouse gas emissions are not controlled.

Global average temperatures continue to rise, but new research shows that the extremes of heat and cold are rising even faster.

Scientists report that heat waves have got hotter and cold snaps have got colder at a more extreme rate – and that continuing greenhouse gas emissions will mean that, in another two decades, Europe could experience once every two years the sort of lethal heat waves that occurred once in a thousand years.

Scott Robeson, professor of geography at Indiana University Bloomington in the US, and colleagues report in Geophysical Research Letters that they analysed a set of temperature records from 1881 to 2011 and graded them according to how near or far they were from the normal averages of any particular region of the globe.

Temperature anomalies

They found that the temperature anomalies – extremes of heat and cold – increased more than the overall average temperature of the whole planet. They  also found that cold anomalies – unexpected ice storms, blizzards and big freezes − increased more than the warm anomalies until about 30 years ago. Since then, the heat waves have started to outpace the cold snaps.

The study offers a new way to consider the much-debated “pause” in global warming since 1998. It could be that warming continued over most of the planet, but was offset by strong cooling in the winter months in the northern hemisphere.

Professor Robeson says: “There really hasn’t been a pause in global warming. There has been a pause in northern hemisphere winter warming.

“Arguably, these cold extremes and warm extremes are the most important factors for human society”

“Average temperatures don’t tell us everything we need to know about climate change. Arguably, these cold extremes and warm extremes are the most important factors for human society.”

Robeson and his colleagues are not the first to identify the importance of extremes of temperature in the pattern of global averages. Nor is this the first time that UK Met Office scientists – this time led by Nikos Christidis – have forecast more, and more severe, heat waves, not just in Europe but in many regions.

In 2004, Met Office researchers looked at statistics since 1990 and decided that the 2003 European heat wave − estimated to have claimed at least 20,000 lives, and possibly many more − had been made more than twice as likely because of human influence on the climate.

Pattern of warming

In a paper in Nature Climate Change, they look at the pattern of warming between 2003 and 2012. In that period, summers on average warmed by 0.81°C.

This warming means, they say, that heat waves − and extreme heat waves such as the lethal event in 2003 − have become 10 times more likely.

“Extremely warm summers that would occur twice in a century in the early 2000s are now expected to happen twice a decade,” Dr Christidis says.

“Moreover, the chances of heat waves as extreme as seen in 2003 have increased from about one in a thousand to about one in a hundred years, and are projected to occur once every other year by the 2030-40s under continuing greenhouse gas emissions.”

 

“More Like The Whole Enchilada”: Arctic Stratospheric Warming Event Pushes Entire Polar Vortex Down To Middle/Lower U.S.

In Uncategorized on January 7, 2014 at 8:17 pm

Oldspeak: “At the peak of the Arctic outbreak, temperatures may be between 20°F and 40°F below average in large parts of the continental U.S., with dangerous wind chills affecting cities like Minneapolis, Chicago, Cleveland, St. Louis, Washington, D.C., New York, and Boston. The U.S. will have the dubious distinction of experiencing the largest cold temperature anomalies of any land area in the Northern Hemisphere during the height of the biting cold… The cause of the Arctic outbreak can be traced to northeastern Canada and Greenland, where an area of high pressure and relatively mild temperatures is set to block the eastward progression of weather systems, like an offensive lineman protecting the quarterback from the other team…  The atmospheric blocking is forcing a section of the polar vortex to break off and move south, into the U.S. The polar vortex is an area of cold low pressure that typically circulates around the Arctic during the winter, spreading tentacles of cold southward into Europe, Asia, and North America at times. Except this time, it’s not a small section of the vortex, but what one forecaster, Ryan Maue of WeatherBELL Analytics, called “more like the whole enchiladaAndrew Freeman

More than half the US population is under a wind chill warning as a blast of freezing Arctic air sweeps south and east across the country, bringing the coldest temperatures for decadesThe US saw colder temperatures than Almaty, Kazakhstan, where it was -22C (8F), Mongolia at -23C (-8F) and Irkutsk, in Siberia, at -33C (-27F)… The National Weather Service has issued life-threatening wind chill warnings for temperatures as low as -51C (-60F) in western and central Dakota and officials in Indiana – hit by high winds and more than a foot (30cm) of snow – urged residents to stay indoors. –Duncan Barkes

“When America is colder than fucking Siberia, something is terribly, terribly wrong.  Entire weather patterns are being drastically altered on a regular basis. The temperature dropped 50 degrees in 3 HOURS yesterday in New York.  Last year the polar vortex, that’s always supposed to stay in or near the arctic, was cleaved in two and moved south as a result of arctic warming via loss of sea ice. This year, the whole fucking thing moved south in one direction at once. As the climate warms the irreversible feedback loops currently in progress will accelerate. Weather will become less and less predictable and more and more extreme. Meanwhile, at the same time record cold grips North America, record heat is wilting Australia. This is the new normal. The era of stable climate has passed.” -OSJ

Related Story

Polar Vortex: 187 Million Hit By Big Freeze

By James S @ Daily Kos:

If the planet is warming — how can it be so damn cold out there, in the winter?

Well the connections are complex, but they are not unfathomable (to science and physics literates.)
‘Polar vortex’ to blast frigid air over much of US

by Carson Walker, Associated Press; boston.com — Jan 3, 2014

SIOUX FALLS, S.D. (AP) — The weather warnings are dire: Life threatening wind chills. Historic cold outbreak.Winter is normally cold, but starting Sunday tundra-like temperatures are poised to deliver a rare and potentially dangerous sledgehammer blow to much of the Midwest, driving temperatures so far below zero that records will shatter.

One reason?  A “polar vortex,” as one meteorologist calls it, which will send cold air piled up at the North Pole down to the U.S., funneling it as far south as the Gulf Coast.
[…]

Here’s what our current mid-latitude Jet Stream looks likes:

Weather ModelGlobal Jet Stream Wind and 250 mb Pressure (animated loop)


larger

Notice how it has those big ‘loopy waves’  (aka high-amplitude Rossby Waves).  It is the big swoop southward that is ushering in the current frigid polar air.
Arctic Outbreak:  When the North Pole Came to Ohio

by Andrew Freedman, climatecentral.org — Jan 2, 2014

[…]
At the peak of the Arctic outbreak, temperatures may be between 20°F and 40°F below average in large parts of the continental U.S., with dangerous wind chills affecting cities like Minneapolis, Chicago, Cleveland, St. Louis, Washington, D.C., New York, and Boston. The U.S. will have the dubious distinction of experiencing the largest cold temperature anomalies of any land area in the Northern Hemisphere during the height of the biting cold.
[…]The cause of the Arctic outbreak can be traced to northeastern Canada and Greenland, where an area of high pressure and relatively mild temperatures is set to block the eastward progression of weather systems, like an offensive lineman protecting the quarterback from the other team.

The atmospheric blocking is forcing a section of the polar vortex to break off and move south, into the U.S. The polar vortex is an area of cold low pressure that typically circulates around the Arctic during the winter, spreading tentacles of cold southward into Europe, Asia, and North America at times. Except this time, it’s not a small section of the vortex, but what one forecaster, Ryan Maue of WeatherBELL Analytics, called “more like the whole enchilada” in a Twitter conversation on Thursday.
[…]

Computer model projection showing the location of the polar vortex (outlined in orange) and areas of below average temperatures (green and blue) and above average temperatures (orange and red), as indicated by the height of atmospheric pressure levels. The annotations show the cold temperature anomaly in the U.S. and mild anomalies across the Arctic. Credit: WeatherBELL Analytics.

The Arctic Vortex is supposed to stay in the Arctic.  It is supposed to form a tight circle, racing around the pole. It is not supposed to branch out and send frigid polar air to the temperate mid-latitudes.  At least not on a ‘regular basis’.

But then again, unusual stratospheric warming in the Arctic, is not supposed to be breaking that Polar Vortex up into smaller pieces, either.

Just because it’s out of sight, doesn’t mean it should be out of mind.

 

[Note:  most of what follows is analysis of last winter’s arctic events — which are looking remarkably similar to this winter’s arctic events.]


Who says all that record-breaking Arctic Ice Melt really doesn’t matter?

Certainly not well informed meteorologists, because they say it kind of does
Stratospheric Phenomenon Is Bringing Frigid Cold to U.S

by Andrew Freedman, climatecentral.org — Jan 21, 2013

[…]
Sudden stratospheric warming events take place in about half of all Northern Hemisphere winters, and they have been occurring with increasing frequency during the past decade, possibly related to the loss of Arctic sea ice due to global warming. Arctic sea ice declined to its smallest extent on record in September 2012.
[…]Sudden stratospheric warming events occur when large atmospheric waves, known as Rossby waves, extend beyond the troposphere where most weather occurs, and into the stratosphere. This vertical transport of energy can set a complex process into motion that leads to the breakdown of the high altitude cold low pressure area that typically spins above the North Pole during the winter, which is known as the polar vortex.

The polar vortex plays a major role in determining how much Arctic air spills southward toward the mid-latitudes. When there is a strong polar vortex, cold air tends to stay bottled up in the Arctic. However, when the vortex weakens or is disrupted, like a spinning top that suddenly starts wobbling, it can cause polar air masses to surge south, while the Arctic experiences milder-than-average temperatures.
[…]

Ok, what’s a Rossby Wave and how does global warming effect them?  (If you have a low threshold for watching videos, this is the best one of the bunch, imo.)
Jennifer Francis – Understanding the Jetstream (and Rossby Waves)

link to clip

Published on Feb 26, 2013 — by rustneversleeps3

A short review of how the jetstream and Rossby waves work, and some emerging indications that the dynamics may be changing in a warming world.

So, what’s a Polar Vortex, and what happens when it get displaced, by one of those unusually TALL bubbles of relatively warm atmosphere, surging northward?
Polar Vortex

link to clip

Published on Jan 18, 2013 — WTHI-TV
Here’s an meteorological map analysis of various Arctic Vortex splits, what causes them, and what they lead to (… record cold in the Mid-Latitudes).
Stratospheric Warming by The SI Weather

link to clip

Uploaded on Dec 16, 2011 — TheSIWeather
Here’s one meteorological speaker, who’s a bit eccentric, but does seem to have a good grasp on Stratospheric Warming events — going Polar, anyways.
Extreme Event  (Vortex Formation and Displacement)

link to clip

Published on Jan 18, 2013 — TurtleIslandNewsDaily.info

Sudden Stratospheric Warming Split the Polar Vortex in Two.the polar vortex was intact at 50 millibars(height in m) on January 1 to 3.

the polar vortex had broken in two (50millibar heights in m) on January 10 to 13

Finally, here’s a good old-fashioned science satellite composite (it’s a very short clip), that shows what happens when the Polar Vortex, gets nudged into going for ‘a power walk’.
GMAOGEOS-5 Stratospheric Sudden warming Event

link to clip

Published on Mar 4, 2013 —  Harold Saive

http://gmao.gsfc.nasa.gov/…http://gmao.gsfc.nasa.gov/…

And finally here’s an updated 2014 Winter forecast, once again ‘blaming that Polar Vortex’ for ‘deciding’ to go meandering somewhere — that we’d rather not see it go.
WRGX; wtvy.com — January 4, 2014

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Valid 12Z Sat Jan 04 2014 – 12Z Mon Jan 06 2014[…]
Forecast models remain consistent in carrying the polar vortex into the northern tier of the U.S. while carrying it eastward in time.

Many locations may see their temperature readings drop to near record values.
[…]

Incredibly, it may feel as cold as -50 to -60 on Sunday night over sections of the north-central states with the frigid air remaining in place into early next week.

As the vortex shifts eastward, the polar air will begin to affect the Great Lakes and Ohio Valley with temperatures plummeting rapidly.

While the air mass will modify, temperatures will remain downright cold with the forecast high in Chicago, IL being only -11 on Monday.

A strong frontal boundary surging eastward ahead of the polar air mass will become rather active as it intercepts increasing amounts of low-level moisture.
[…]

If only those record-melting Arctic ice packs would stay in place and not keep warming up their supposed-to-be Arctic neighborhoods by exposing all that open sea water — then maybe that Arctic Vortex might not have to ‘go wobbling around like a wildly spinning top — losing its fast-track momentum‘ … at such an ever increasing rate.

But then again, Who needs stable Jet Streams anyways?

Certainly not farmers, not foresters, not ranchers;  Certainly not suburban folks who hate all these crazy arctic deep freezes …  the ones who ask, “Why in the world, is it so damn cold, anyways?”

Now hopefully, you can tell them.