Amazonia's Physiographical Characteristics and Rainfall Relationships Studied by Remote Sensing
Case: January 18, 1999
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This graph shows the passage of a convective system through the plots of air temperature (blue), wind speed (magenta) and downward shortwave radiation scaled by a factor of 100 (yellow). From the plots, it can be deduced that the system passes through Ji-Parana, Rondonia between 1200 and 1500 local time. A decrease in air temperature may be attributed to the drop in incoming shortwave radiation. The cloud cover from the system is mainly responsible for the decrease in radiation. The wind speed is rather large but it decreases once the system moves through. |
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As indicated by the reflectivity, a system passed through the area between 1600 and 1900 UTC. The maximum reflectivity is about 35 dBZe around 1600 UTC. |
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The Doppler velocity depicts areas of updraft and downdraft activity associated with the convective system. There appears to be a relatively strong downdraft of -8 m/s around 1600 UTC. |
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The shift of wind direction from variable to fairly constant from the northeast indicates that a system passes throught the area. Once the system passes, the wind direction returns to the oscillating pattern seen before the passage. |