Amazonia's Physiographical Characteristics and Rainfall Relationships Studied by Remote Sensing
Case: February 25, 1999
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The microclimate tower data shows that two systems passed through the area, one between 1300 and 1400 LST, the other, between 1800 and 2000 LST. It appears that the second system is stronger where there is more of a decrease in air temperature and incoming shortwave radiation and there is a sharper increase in wind speed. |
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The two areas of reflectivity are in good temporal agreement with the microclimate tower data above. A maximum reflectivity of about 35 dBZe shows that significant convective activity occurred. |
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Convective activity is apparent through the strong downdrafts as indicated by the Doppler velocity. The time of downdraft activity correlates well with the microclimate tower data. |
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Throughout most of the day, there was a large amount of variability in the wind direction. However, during the passage of the two systems, the wind becomes more constant with a westerly component. |