Weather report: it's back! El Niño returns
In Australia:
The weather phenomenon, associated with warmer tropical waters in the Pacific, occurs about every two to five years and lasts about 12 months.Meanwhile, in Canada, El Niño could mean disaster for the Olympics:
The [Australian] Bureau of Meteorology first warned early last month that an El Niño event appeared to be developing. "It's here," David Jones, the bureau's head of climate analysis, said yesterday. "The only question mark is how long does it last."
He said there had been a very rapid shift from a La Niña event in 2008 to neutral conditions in early 2009 before the latest "fairly classic" El Niño conditions appeared - sea surface temperatures in the equatorial Pacific about 1 degree above average and trade winds weaker than normal.
The return of El Niño could wash out parts of the Vancouver 2010 Winter Olympics, weather forecasters say.In the southern states, it could mean a wetter and warmer winter:The global temperature fluctuation could result in warmer weather and a smaller snowfall, causing problems for the Games, which are set to kick off in February. Meteorologist Mark Madryga said the climate phenomenon could mean warmer temperatures for the mountains surrounding Vancouver.
A warm east Pacific (El Niño) translates to a stronger southern storm track over the U.S. and a wetter south.And, in the northern states:
A La Niña helps to provide drier weather with less available storm energy. Texas has been in a persistent drought for several years and La Niña is at least partly to blame.
NOAA forecasts this El Niño to gradually increase during the next several months. The event is expected to last through winter 2009-10.
Typically, a warmer winter…
The most recent El Niño occurred back in 2006 providing southeastern Minnesota with the warmest January on record.
And during an intense El Niño episode back in 1998, southeastern Minnesota recorded its second warmest year ever!
Precipitation trends with El Niño aren't as clear, but with milder temperatures we may receive less snow, and more ice and rain.
In the USA, look for more precipitation in the arid Southwest, less wintry weather across the North and a reduced risk of Florida wildfires. The downside can include damaging winter storms in California and increased storminess in the South.El Niño may dampen hurricane season:
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The warming Pacific water's has an effect on the atmosphere. It causes pressure fields to change, which then changes the wind patterns.
Our sub-tropical jetstream is more zonal, meaning it is pretty much west to east and less amplified. It usually sets up across the southern part of the United States bringing plenty of tropical moisture.
Due to the flow of the jetstream, El Niño years have been found to cause less Atlantic hurricanes. At the same time they can cause damaging winter storms in California leading to flooding and mudslides.
The waters are warming up in the tropical Pacific, and that may be good news for the residents of the Atlantic and Gulf coasts.Return of El Nino Could Change Hawaii Weather:
Government scientists this morning announced that an El Niño - an anomalous warming of surface waters in the equatorial Pacific that spans thousands of square miles - was under way.
They said it would probably last through the winter. El Niño has widespread effects on weather in the United States, but its specific impacts around here are impossible to predict.
El Niño, however, is known to have a dampening effect on the U.S. hurricane season. El Nino generates powerful upper-air winds from the west that travel into the Atlantic Basin and can snuff out incipient storms before they grow into hurricanes.
El Niños reoccur roughly every two to five years, with the last one in 2006.
Its other positive effects can include drought-breaking rains in the Southwest and more rain in the Southeast, lowering the risk of wildfires in Florida.
But El Niños also have produced devastating storminess in California and Central and South America and disrupt marine life on the West Coast.
According officials at the National Weather Service, Hawaii could be hit with some unwelcomed weather.But weather forecasting is tricky. Major pattern changes take place over thousands of years and we have only been observing the weather scientifically for a few hundred years. (It amazes me how socalled scientists can so arrogantly predict global warming.) And this El Niño is different from those observed before.
Hawaii's most powerful hurricanes hit during El Nino years. Another danger is the lack of rainfall during El Nino years.
"You're gonna see potentially monthly rainfall values of less than 50 percent of normal, across a lot of areas of the state and especially even wet places," said Ray Tanabe of the National Weather Service.
In fact there may really be Los Niños:
El Nino, the seasonal Pacific Ocean warming that affects the world's weather, may not be just one little boy -- it seems to be two little boys.For anyone who studies the weather, one thing is very obvious: "weather" is dominated by water and air. They both flow according to the effects on them of pressure and temperature. Weather is "fluid" and not easily predicted. In fact the biggest influence on earth's weather and climate is the sun which has been in a dormant phase.
Two distinct patterns of warming occur in the Pacific Ocean, according to researchers at the Georgia Institute of Technology in Atlanta, and their frequencies have been changing in recent decades.
But after poring over more than half a century's worth of atmospheric and oceanic data collected by national and international centers, the Georgia Tech researchers concluded that there are in fact two forms of Pacific Ocean warming, and that these have different effects on the frequency and paths of North Atlantic hurricanes.
One form, eastern Pacific warming, correlates with hurricane activity identical to that of the conventional El Nino.
"The nature of El Nino is changing, and there are lots of subtleties," Webster said. "We want to predict those variations in El Nino and work out what the implications are of this new type of Pacific Ocean warming."
Now apparently sunspots are forming for the first time in two years:
After nearly two years of an acne-free surface, the first sunspots are starting to pop up on the Sun. Sunspots are regions on the Sun where the magnetic field lines of our nearest star erupt through its surface, and are an indicator of the amount of magnetic activity going on inside the Sun. Unlike a simple bar magnet, the solar magnetic field activity increases and decreases on a roughly 11-year cycle, and the number of sunspots follows in response. When the magnetic activity starts to rise after the cycle bottoms out, sunspots start to appear at a solar latitude of 22 degrees, and spread north and south from there.Of course I'm hoping for a wet winter after last season's warm dry winter.Right now we’re at the bottom of the cycle, and sunspots are rare. But this two-year lack of spots has been the longest such period for nearly a century, and it’s had solar astronomers scratching their heads. That’s not too surprising, as the Sun is a fiendishly and vastly complex system of churning gas, and it’s numbingly difficult to observe and model it.
But astronomers have just made an important breakthrough in solar observations that links the way the gas under the Sun’s surface behaves with the way sunspots form.
























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