Judul : Extreme weather is upon us
link : Extreme weather is upon us
Extreme weather is upon us
Extreme weather is upon us. Global warming is increasing the intensity, occurrence, size, duration and impact of many catastrophic events, including wildfires, droughts, heat waves, cold snaps, storms, lightning, flooding and seismic events.Ever larger numbers of people are getting hit directly by such events, as well as indirectly due to lack of fresh water, food, shelter, medicine, health care and emergency services.
The following three images show Hurricane Irma (left) and Hurricane Jose (right), and are forecasts for September 10, 2017. The image directly below shows that waves are forecast to be as high as 48 ft (or 14.63 m).
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| Waves for September 10, 2017, 15:00 UTC (at green circle, 26°N, 80°W) are forecast as high as 48 ft or 14.63 m |
The image below shows that winds are forecasts to be as fast as 163 mph (or 263 km/h).
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| Winds for Sept. 10, 2017, 12:00 UTC (green circle, 25.5°N, 80.5°W, 850 hPa) forecast as fast as 163 mph or 263 km/h |
Forecasts were posted widely, such as the image below that was posted at facebook.
Earlier, Hurricane Harvey hit Houston. Again, warnings were posted widely, such as the forecast below, posted at facebook.
Extreme weather is amplified by changes to the Jet Streams. As the Arctic is warming more rapidly than the rest of the world, the temperature difference between the Arctic and the Equator is narrowing, which is slowing down the speed at which the Jet Streams circumnavigate the globe.
The Coriolis Effect makes Jet Streams circumnavigate the globe horizontally, and this used to keep cold air inside the Arctic and warmer air outside of the Arctic.
As the Jet Streams circumnavigate the globe at lower speeds, they increasingly move more vertically, allowing cold air from the Arctic to come down, while also allowing warm air to move up into the Arctic.
This is illustrated by the image on the right, showing Jet Streams crossing the Equator at speeds as fast as 82 km/h or 51 mph (at the location marked by the green circle, at 250 mb) on August 27, 2017, 21:00 UTC. The image also shows Jet Streams crossing the Arctic at multiple locations.Furthermore, numerous cyclones are visible on the image. As Earth retains more energy, winds and currents are getting stronger, waves are getting higher, etc., while higher temperatures are also causing winds to carry more moisture. This is especially the case for cyclones that are furthermore powered up by high sea surface temperatures.
Rising temperatures are increasing the amount of water vapor in the atmosphere at a rate of 7% more water vapor for every 1°C warming. This is further speeding up warming, since water vapor is a potent greenhouse gas. Over the coming years, a huge amount of additional water vapor threatens to enter the atmosphere, due to the warming caused by albedo changes in the Arctic, methane releases from the seafloor, etc., as described at this page.
The situation is dire and calls for comprehensive and effective action, as described at the Climate Plan.
Links
- Climate Plan
http://ift.tt/2hoyCKz
- How much warming did and could people cause?
http://ift.tt/2vSbvlR
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