| jianeugx | Date: Friday, 2013-11-08, 04:09:14 | Message # 1 |
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| Another index that has an effect of winter weather in the United States is the Arctic Oscillation. This index fluctuated between positive and negative values. Positive values tend to keep much of the cold air locked across Canada. The index has turned negative recently and this could mean cold air will have an easier time moving southward. There are all sorts of combinations of both the NAO and AO that affect our weather. Last year both indices were negative and most likely heavily contributed to our rough winter. While we are gaining a better understanding of these indices, there is much more we can learn. There are other oscillations as well like the Pacific Decadal Oscillation (PDO) and the Madden Julian Oscillation (MJO) each playing a role in our weather. With so many combinations of the various indices you can quickly see why it can be hard to predict the future. Then there are El Nino and La Nina both of which have tremendous impacts on our weather. We have seen a double El Nino over the past few years. These phenomena are cycles of warming and cooling of ocean water in the Equatorial Pacific.
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Many western hummingbirds are remarkably tolerant of sub freezing (and even, for a few days, sub zero) temperatures. This makes sense, since many of them nest in cold climates, including elevations near timberline in the Rockies or Cascades, or as far north as southcentral Alaska. Rufous hummingbirds may return to their nesting grounds in Alaska or British Columbia as early as April, when the snow still lies deep in the forest.
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