meteorology - What is the definition of wind gust? - Earth Science ...
2017年5月22日 · Wind Gust: Is a sudden, brief increase in speed of the wind. According to U.S. weather observing practice, gusts are reported when the peak wind speed reaches at least 16 knots and the variation in wind speed between the peaks and lulls is at least 9 knots. The duration of a gust is usually less than 20 seconds.
What wind speeds and gusts can usually damage houses or trees?
2017年10月29日 · However, in situations with significant gusting, such as severe convective storms, greater convergence on the leading edge (due speed change) may more increase the stress. I tend to think that may be part of why F1 and F2 tornadoes typically do more consistently notable damage over their path than similar strength hurricane wind gusts.
Judging wind speed based on flags and inland-water observations
$\begingroup$ Thanks - the Weather Underground site shows the wind at 15 mph gusting to 28 (so force 4 gusting to 6). Earlier that day the wind was 19 gusting to 39 according to that site. $\endgroup$ –
meteorology - What determines how fast clouds move? - Earth …
2017年9月20日 · The wind is often strongest in the upper troposphere (there are no clouds in the upper atmosphere), so upper tropospheric clouds will move faster than near-surface clouds. Convection: strong updrafts will force particles upward, as will forced convection by wind reaching obstacles; Particle size: larger particles are more likely to fall down.
climate change - Could the extraction of energy by wind turbines …
2014年10月10日 · So deploying lots of wind turbines just moves where that energy gets taken out of the wind, but not how much. An unshrouded turbine can extract at most 16/27ths (59.3%) of the wind's kinetic energy - that's the Betz limit. In practice, it's more like 20-50%. Here's the power curve for an E82-Enercon 3MW turbine, from the Enercon brochure:
Why does the wind periodically change direction?
All of this wind is moving mass around and the net result of this is that the wind is causing the pressure field to evolve, and these changes feedback into the wind. The above effects can be rolled into the non-linear and friction terms in the momentum equation, which are the reasons that your observations of the wind periodically change ...
Why are there no hurricanes in the southern Atlantic basin?
There are two primary reasons why tropical cyclones are rare in the south Atlantic basin. First, vertical wind shear between 850 mb and 200 mb is typically greater than 10 meters per second (check out the long-term average of vertical wind shear between 850 mb and 200 mb).
Is the temperature (even a bit) warmer in a forest?
2014年12月31日 · $\begingroup$ @JeopardyTempest: No single source stating it explicitly, but it's based on established facts; it's well known how compost produces a lot of heat, often enough for piles to keep themselves warm even when exposed to external sub-zero temperatures, and it's also well known how forest soils without very rapid nutrient cycling are full of humus, which is essentially the end-product ...
meteorology - How could humans alter storm intensity or …
2014年7月31日 · It is possible to change a storm a tiny bit by harvesting some of the wind energy atleast localy by using wind mills. The energy of even the weakest storm is multiple gigawatts and in a strong storm the energy can reach into the range of terrawatts,unless we can harvest a significant part of this it will be impossible to change a storms force ...
Is it possible to create an enclosed manmade weather system?
$\begingroup$ From inside a cloud does appear like fog. But you can be very close to the outside of a cloud and still see its texture.