Rainfall Over Ocean (con’t)
Rain rate determination
- Empirical tuning to co-incident radar
- RR=a Q b RR = a SI b
Accuracy and limitations
- Instantaneous rain rate +/- 25%?
- Questions on low and high end rates
- Beam filling errors
- Rain area fairly reliable
- Some concerns on ”west coast” rainfall; too low?
- Freezing level/Q depth incorrect?
- Tropical systems; too low?
- Coastline rainfall limited due to land effects:
- Minimize noise reduces sensitivity to stratiform rain