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| Base Ref 124nm Elev=0.5 deg 1.16 km²/pixel GSP : Greer SC 34.88N 82.22W 06/16/99 22:34 Precip Mode VCP 21 Max: 66 dBz |
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Precipitation
The following reflectivity image shows extensive precipitation over the GSP Greer, SC radar station on the evening of 16 June, 1999. Notice the "blocky" and irregular appearance of precipitation. Also notice very high reflectance values, approaching 60-65 dBZ in some areas of this frame (up to 747 millimeters of rain per hour). Rapid changes in reflectance values over short distances are often associated with precipitation. These features are characteristic of rain events and embedded thunderstorms. Compare the reflectance of precipitation in this frame with reflectance of insects and birds.
| NEXRAD reflectivity scan showing large precipitation event | |||||||||||||||||||||
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The following velocity image shows extensive precipitation over the GSP Greer, SC radar station on the evening of 16 June, 1999. Complex velocities are often associated with passing thunderstorms and rain events. In this image such complexitity can be seen in wind directions at different distances from the radar station. Close to the station (look for the 30 nmi marker or the innermost white ring) notice that winds are NE at approximately 10 knots. However, at a greater distance (look at the 90 nmi marker or the third white ring from center) from the station winds are SW at 10-20 knots. The partial ring of purple visible around the outer edges of the radar scan is range folding. Range folding represents regions of ambiguous velocity in which reflected energy from targets interacts with an outgoing pulse of energy from the radar.
| NEXRAD velocity scan showing large precipitation event | |||||||||||||||||||||
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