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Rain Radar for Central Macedonia |
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| Map showing the covered areas of Central Macedonia. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Central Macedonia and Thessaly Rain Radars | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Map showing the covered areas of Central Macedonia and Thessaly. |
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The scale of dBZ values can be seen at the right side of the image. |
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dBZ stands for decibels of Z. It is a meteorological measure of equivalent reflectivity (Z) of a radar signal reflected off a remote object. The reference level for Z, is related to the number of drops per unit volume and the sixth power of drop diameter. Reflectivity of a cloud is dependent on the number and type of hydrometeors, which includes rain, snow, and hail, and the hydrometeors ' size. A large number of small hydrometeors will reflect the same as one large hydrometeor. The signal returned to the radar will be equivalent in both situations, so a group of small hydrometeors is virtually indistinguishable from one large hydrometeor on the resulting radar image. A meteorologist can determine the difference between one large hydrometeor and a group of small hydrometeors as well as the type of hydrometeor through knowledge of local weather condition contexts. Despite the detailed scale above, a more "realistic" approach of rain rate is as follows: |
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0-8 Barely anything |
8-23 Light |
24-39 Moderate |
40+ Heavy+ |
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