Now, looking at the news today, it’s snowing, freezing, and I’m sitting here in a jacket. This is definately not normal for late april.
Now what I’m wondering, is how does this justify with global warming. I’m sure there’s a rational explanation, I’m just not all that knowledgable about the subject. Anyone wanna help out?
Global warming, if it exists, is the increase in average global temperature over a long period of time. An unusual temperature over a couple days in a small area (compared to the entire world) does not affect the average earth temperature to any appreciable degree.
Global warming also increases the variability of weather which means that lots of places are going to get either hotter or colder than they normally were.
More info on global warming from Wikipedia. Some models of global warming predict greater climate variability, actually. Don’t count on global warming to turn your northern home into a tropical paradise
Global warming refers to a higher-temperature climate, rather than weather. The net result is that there is more energy in the atmosphere, which in turn causes more moisture and more wind motion. Net result is more storms.
Global warming exists. We are absorbing more on the suns energy than before, so we are either getting warmer or spinning faster.
The effect of warming on weather is complicated, which is why cold snaps or cold winters always brings this type of a question.
The added heat adds volatility and variability to weather patterns. Warming will increase the likelihood of hurricanes, floods, droughts and even blizzards.
A not quite accurate but useful analogy for non-scientists is to think of it like gambling in Vegas.
Old weather patterns might be like the nickel slots. You don’t win huge amounts, you don’t lose huge amounts and the house gets 3 cents on every dollar bet. Play for an hour and you could be up or down a couple hundred.
New weather patterns might be like the massive gold plated, five dollar a pull slot machine in the lobby. The top payoff is a million dollars, but you burn through your money fast and the house gets 7 cents on every dollar bet. Play for an hour and you could be up or down a few thousand.
I tell you’ll lose more money on the big slot machine, and you say “How can that be? My brother’s cousin’s former roommate won 10 grand on it.”
It’s the difference between specific occurences and tendencies. In the gambling example, the chances of a massive payout increase even when the chances of coming out ahead go down. In global warming, the chances for a nasty brutal winter storm increase, even when the global average temperature goes up.
The last Ice Age is thought to have occurred when rising temperatures melted enough ice cap freshwater to disrupt the Global Conveyor, whose moderating influence essentially prevents alternating freezing winters and scorching summers.
The most noticeable and profound changes first attributed to global warming getting out of control will be severely prolonged and colder winters. This seems counter-intuitive, but SentientMeat has the right link. A disruption of the Global Conveyor and the Gulf Stream leading to a freeze, rather than a scorching blast of heat.
The question is not whether it exists. The data shows that it does (depending of course on your time frame. Over the last few hundred years=yes. Over the last 350 million years, who knows).
The questions are:
Is it caused by man?
Is it merely part of a cycle that has happened many times in the past?