| 摘要 |
<p>A geostrophic winds forecasting method (10) determines an atmospheric density (D) (14) and a Coriolis parameter (F) (16) at a given location. The atmospheric pressure is detected N times (20) at the location over a predetermined period of time (t). The period of time (t), e.g., two hours, corresponds to the time required for a pressure surface to travel a distance (x) at an empirically determined velocity, e.g., 35 knots. The change in pressure (ΔP) is detected over a period of time (t). The geostrophic wind velocity (VG) is then determined (22), according to the invention, based on the following relationship: VG = [1/(D x F)] x [ΔP/X]. The resulting geostrophic wind velocity (VG) is then displayed (25). At 35 knots, over a given two hour period, the distance X traveled by the pressure surface is approximately equal to 129,640 meters. The method is embodied in a weather instrument comprising a conventional barometer to produce a weather forecasting station.</p> |
