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Aeronautical Meteorological Common sense |
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| (6) Can we get the Could Top Height by radar products? |
| (6) Can we get the Could Top Height by radar products? |
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The radar products present the intensity and covering range of reflectivity. Higher intensity means higher moisture. In a fully developed convection system, strong reflectivity will only be distributed in the core of convection. The underlying strong convection induces divergence at the top, but it cannot be inspected in radar systems. Therefore, radars are not good tools to represent the real cloud top height. We can use cloud top height product value in JMDS instead, since this product provides more realistic cloud top height information. |
| (7) Which IR channel of satellite images are those on the TV weather reports? |
| (7) Which IR channel of satellite images are those on the TV weather reports? |
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IR satellite images used in TV weather reports are IR1 channel and tones-enhanced images based on the cloud top temperature. |
| (8) In the visible satellite images, can we interpret the brighter area as with more moisture but not necessarily with heavy rain? And in the gray area, does it means less moisture but still might be raining? |
| (8) In the visible satellite images, can we interpret the brighter area as with more moisture but not necessarily with heavy rain? And in the gray area, does it means less moisture but still might be raining? |
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That statement is true. Therefore IR satellite images are needed when diagnosing weather by satellite images. Significant bright area in visible satellite images with low cloud top temperature in IR satellite images means convective activities, might bring severe precipitation even thunder storms. |
| (9) Is Upper Cold Core Low (UCCL) seasonal? |
| (9) Is Upper Cold Core Low (UCCL) seasonal? |
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According to the international UCCL-related literature and statistics collected by TAMC, UCCL appears once about every three days in summer and about every week in winter. |
| (10) How do we identify low-level depression on satellite images? |
| (10) How do we identify low-level depression on satellite images? |
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The difference between low-level depression and UCCL is that low-level depression has a warm core with convergence effect. A low-level depression often carries a lot of cloud in the satellite images. Therefore it is much easier to be identified than UCCL. |
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