This can be positive or negative. A force of 1 newton applied to a mass of 1 kilogram causes an acceleration of 1 meter per second per second. The WSR-88D is an improvement over the previous Weather Service radars in that it is more sensitive to weak echo returns, provides finer details of storms and sees them at greater distances, and is automated in its scanning strategy. Additionally, it has several special products like wind velocity, spectrum width, storm-total precipitation accumulation estimates, and vertical wind profiles. The clouds are several thousand feet thick and will completely block the Sun.
Noctilucent clouds look similar to cirrus clouds.
They can only be seen at high latitudes, usually in the summer when the Sun is below the horizon. The name given to the possible climatic effect resulting from a nuclear war. In the 1980's it was hypothesized that vast quantities of dust and soot would be injected into the atmosphere by a nuclear war and its aftermath. A method of forecasting the weather through the use of mathematical models and computers which predict the state of the atmosphere at some future time. The forcing of the climate by the variation in the solar radiation incident upon the Earth as determined by the Earth's orbital parameters.