Wild weather patterns

Meteorologist Dr. Jeff Masters continues to sound the alarm on our extreme weather patterns. Maybe someone in a position to do something about manmade climate change policies should, you know, do something about it?

Flowers are sprouting in January in New Hampshire, the Sierra Mountains in California are nearly snow-free, and lakes in much of Michigan still have not frozen. It’s 2012, and the new year is ringing in another ridiculously wacky winter for the U.S. In Fargo, North Dakota yesterday, the mercury soared to 55°F, breaking a 1908 record for warmest January day in recorded history. More than 99% of North Dakota had no snow on the ground this morning, and over 95% of the country that normally has snow at this time of year had below-average snow cover. High temperatures in Nebraska yesterday were in the 60s, more than 30° above average. Storm activity has been almost nil over the past week over the entire U.S., with the jet stream bottled up far to the north in Canada. It has been remarkable to look at the radar display day after day and see virtually no echoes, and it is very likely that this has been the driest first week of January in U.S. recorded history.

Portions of northern New England, the Upper Midwest, and the mountains of the Western U.S. that are normally under a foot of more of snow by now have no snow, or just a dusting of less than an inch. Approximately half of the U.S. had temperatures at least 5°F above average during the month of December, with portions of North Dakota and Minnesota seeing temperatures 9°F above average. The strangely warm and dry start to winter is not limited to the U.S–all of continental Europe experienced well above-average temperatures during December.

The cause of this warm first half of winter is the most extreme configuration of the jet stream ever recorded, as measured by the North Atlantic Oscillation (NAO). The Arctic Oscillation (AO), and its close cousin, the North Atlantic Oscillation (which can be thought of as the North Atlantic’s portion of the larger-scale AO), are climate patterns in the Northern Hemisphere defined by fluctuations in the difference of sea-level pressure in the North Atlantic between the Icelandic Low and the Azores High. The AO and NAO have significant impacts on winter weather in North America and Europe–the AO and NAO affect the path, intensity, and shape of the jet stream, influencing where storms track and how strong these storms become.

During December 2011, the NAO index was +2.52, which was the most extreme difference in pressure between Iceland and the Azores ever observed in December (records of the NAO go back to 1865.) The AO during December 2011 had its second most extreme December value on record, behind the equally unusual December of 2006. These positive AO/NAO conditions caused the Icelandic Low to draw a strong south-westerly flow of air over eastern North America, preventing Arctic air from plunging southward over the U.S. and Europe.

[…] We will (finally!) get the first major storm of 2012 in the U.S. early next week, when a low pressure system will develop over Texas and spread heavy rains of 1 – 3″ along a swath from Eastern Texas to New England during the week. This storm will pull in a shot of cold air behind it late in the week, giving near-normal January temperatures to much of the country, and some snow to northern New England. Beyond that, it is difficult to tell what the rest of winter may hold, since the AO is difficult to predict more than a week or two in advance. The latest predictions from the GFS model show the current strongly positive AO pattern continuing for at least the next two weeks, resulting in very little snow and warmer-than-average temperatures. If we don’t get significant snows during the latter part of winter, the odds of a damaging drought during the summer in the Midwest will rise. The soils will dry out much earlier than usual without a deep snow pack to protect them, resulting in a much earlier onset of summer-like soil dryness. Water availability may also be a problem in some regions of the west due to the lack of snow melt. Fortunately, most Western U.S. reservoirs are above average in water supply, due to the record-breaking snows of the previous winter.

13 Responses to Wild weather patterns

  1. Tom January 10, 2012 at 9:31 am #

    Don’t forget that our impact on climate-change is being mixed with a bunch of other non-human caused factors like earthquake patterns, Earth’s magnetic field weakening and like the fact that the North Pole is migrating toward Russia at the rate of about 40 miles per year and accelerating.

  2. Kurt January 10, 2012 at 10:27 am #

    As much as I wish we had national leaders who would lead in solving this problem, we don’t. The only way we’re going to make progress in the near-term is to convince more people on a personal level of things they can do as individuals and in their communities to avoid greenhouse gas production. Some actions that have a large effect on climate change include air travel, choice of vehicle, use of mass transit, home heating, choice of foods (local, non-animal, etc.) and (maybe surprisingly) recycling and composting.

    This really is the biggest issue, because if we don’t solve it, none of our other economic or social problems will matter.

  3. jawbone January 10, 2012 at 10:33 am #

    Well…Tom, that’s very intriguing. Any links for us to get some background on what you’ve written? T/U.

    How often and by how much does magnetic north wander? Is this a portent of the polarity switch which is overdue? I may have used the wrong term, as I barely recall the program I saw on PBS about that last matter.

  4. k January 10, 2012 at 10:35 am #

    By the way, kiss your maple syrup goodbye. (Who was it? Perry? Better let him know.)
    The big problem, of course, will be when the jet stream shifts, and all that accumulated cold air comes down. Full moon’s over. It should happen soon.

  5. k January 10, 2012 at 10:36 am #


    North Magnetic core moving. I don’t know what effect it could have on the weather.

  6. Imhotep January 10, 2012 at 10:37 am #

    Kurt. follow the money. Who gets it (the money)? Big Oil. Who buys our political class one politician at a time? Big Oil. Is oil a “free market” commodity? No, it’s priced by a cartel. Who are the least smart people in the country? The American electorate. Why? Because they think that the capitalist system is the greatest economic system ever invented. Who convinced them of that? Big Oil. Follow the money.

  7. Kurt January 10, 2012 at 10:55 am #

    Imhotep, you’re right, and I think it’s useful to identify the people and groups that threaten our survival and to understand how they operate. But knowing who they are and knowing they are powerful doesn’t change the fact that we must overcome them if we want to survive.

  8. NormanLake January 10, 2012 at 11:13 am #

    When you watched Howdy Doody on TV back’in the day’, you could see the strings, but you suspend disbelief, and Howdy still was the focus. The actual string puller was hidden and unknown. Same with the operators of ‘our’ government.

  9. Ten Bears January 10, 2012 at 11:14 am #

    Earthquake patterns, the Earth’s magnetic field and like the North Pole’s migration have nothing to do with climate change, rube, so put down the Ambien, Prozac, Viagra and crotch-shots on Fox News Kool-Aid and turn off the television.

    Yawl’ out east had best enjoy the mild weather, because when the North Atlantic Conveyor collapses – as it has in the past – it will collapse – northeastern “America” and most of “Europe” will- as it has in the past – become uninhabitable.

  10. Major Kong January 10, 2012 at 2:41 pm #

    Holy cow.
    Before the Laurentide ice sheet began melting 15,000 years ago, there was two miles of ice above what is now Albany, NY. The melting glaciers and the water from them formed Long Island Sound, raised global sea levels about 250 feet, flooded the Susquehanna River valley creating what is now the Chesapeake Bay, and closed that pesky land bridge between Alaska and Russia.

    Conditions have much improved in the past 15,000 years as this present interglacial warming period proceeds. The Earth is still in an ice age, historically speaking, and for the most part, the Earth has been mostly much warmer than this in the past. Paleoclimatology is so easy even a caveman can do it!

  11. Imhotep January 10, 2012 at 3:32 pm #

    Major Kong, while sitting in traffic on any California freeway the mind wanders and begins to wonder at what point the poisons being emitted by all those tailpipes spewing carbon monoxide will have saturated the air outside the car to the point of no return? At which time all those vehicles will begin to veer this way and that as the drivers all die in place. Heat is not our only problem when we burn shit (like oil) that can kill us all.

  12. Major Kong January 10, 2012 at 5:38 pm #

    This isn’t the first time Earth organisms have altered the atmosphere. http://en.wikipedia.org/wiki/Great_Oxygenation_Event

  13. Izquierdo January 11, 2012 at 1:39 am #

    Not to worry.
    All this is just a theory, like gravity and genetics.

Site Meter