The idea is that climate change doesn’t merely increase the overall likelihood of heat waves, say, or the volume of rainfall — it also changes the flow of weather itself. By altering massive planet-scale air patterns like the jet stream
.. The idea is that climate change doesn’t merely increase the overall likelihood of heat waves, say, or the volume of rainfall — it also changes the flow of weather itself. By altering massive planet-scale air patterns like the jet stream
.. But when the Arctic warms up faster than the equator does — which is part of the fundamental definition of global warming, and which is already happening — the jet stream’s flow can become weakened and elongated. That’s when you can get the resultant weather extremes.
.. What the new study is saying is that in summer, in particular, this can occur... explain how enhanced high-latitude warming trends may trigger remote weather impacts,” he said.
Map: Hurricaine Matthew Winds
Ventusky weather map
Hurricane Joaquin Forecast: Why U.S. Weather Model Has Fallen Behind
By early 2013, the European model had nearly 10 times the raw computing capacity of the Global Forecast System, or G.F.S., which is run by theNational Weather Service. There were other problems, too, and the cumulative effect was obvious and irrefutable: The G.F.S. was doing worse than it rivals, and it played out in high-profile cases, like Sandy.
.. The European model’s data assimilation relies on more observations than the G.F.S. — including satellite measurements of radiation from clouds, which is crucial in areas with relatively few land observations. It also assimilates the data over time, allowing the model to start with the evolution of the weather heading into the forecast period, not just a snapshot.