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Radar and lightning detection

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Quantitative precipitation estimation

Radar observations can be used to estimate precipitation rates at ground level. The radar provides precipitation observations at high spatial and temporal resolutions and over a wide geographical domain.

Radar-based precipitation estimates are however affected by various sources of error. These estimates are derived from radar reflectivity measurements at a given altitude which are not necessarily representative of ground conditions. Besides, the conversion from reflecitivity to rain-rate strongly depends on the drop size distribution which is unknown. Miscalibration, ground echos, attenuation and occultation effects also affect precipitation estimates. 

Current efforts within the RMI radar group for improving radar-based precipitation estimates focus on VPR correction and radar-gauge merging.

 

VPR correction

Radar-gauge merging